X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Ftv%2Ftv.c;h=e0b51c18b735148b618076a36f1d4be70cb81014;hb=45ecc187cee7107c83c1f9618a1e1e586df73644;hp=f97719dfe3f68025996323ed7bbeaa631c7afcda;hpb=40a6765d7070327d04bd70edb412cdba764627bd;p=libfirm

diff --git a/ir/tv/tv.c b/ir/tv/tv.c
index f97719dfe..e0b51c18b 100644
--- a/ir/tv/tv.c
+++ b/ir/tv/tv.c
@@ -1,31 +1,40 @@
 /*
- * Project:     libFIRM
- * File name:   ir/tv/tv.c
- * Purpose:     Representation of and static computations on target machine
- *              values.
- * Author:      Mathias Heil
- * Modified by:
- * Created:
- * CVS-ID:      $Id$
- * Copyright:   (c) 2003-2007 Universität Karlsruhe
- * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
  */
 
-/*
- *    Values are stored in a format depending upon chosen arithmetic
- *    module. Default uses strcalc and fltcalc.
+/**
+ * @file
+ * @brief    Representation of and static computations on target machine
+ *           values.
+ * @date     2003
+ * @author   Mathias Heil
+ * @version  $Id$
+ * @summary
  *
+ * Values are stored in a format depending upon chosen arithmetic
+ * module. Default uses strcalc and fltcalc.
+ * This implementation assumes:
+ *  - target has IEEE-754 floating-point arithmetic.
  */
-
-/* This implementation assumes:
- *  - target has IEEE-754 floating-point arithmetic.  */
-
-
 #ifdef HAVE_CONFIG_H
 # include "config.h"
 #endif
 
-
 #include <assert.h>         /* assertions */
 #include <stdlib.h>         /* atoi() */
 #ifdef HAVE_STRING_H
@@ -48,6 +57,7 @@
 #include "irtools.h"
 #include "xmalloc.h"
 #include "firm_common.h"
+#include "error.h"
 
 /** Size of hash tables.  Should correspond to average number of distinct constant
     target values */
@@ -84,13 +94,29 @@ enum float_to_int_mode {
 
 #define fail_verify(a) _fail_verify((a), __FILE__, __LINE__)
 
-/****************************************************************************
- *   private variables
- ****************************************************************************/
-static struct set *tarvals = NULL;   /* container for tarval structs */
-static struct set *values = NULL;    /* container for values */
+/** A set containing all existing tarvals. */
+static struct set *tarvals = NULL;
+/** A set containing all existing values. */
+static struct set *values = NULL;
+
+/** The integer overflow mode. */
 static tarval_int_overflow_mode_t int_overflow_mode = TV_OVERFLOW_WRAP;
 
+/** if this is set non-zero, the constant folding for floating point is OFF */
+static int no_float = 0;
+
+/** IEEE-754r half precision */
+static const ieee_descriptor_t half_desc     = {  5,  10, 0, NORMAL };
+/** IEEE-754 single precision */
+static const ieee_descriptor_t single_desc   = {  8,  23, 0, NORMAL };
+/** IEEE-754 double precision */
+static const ieee_descriptor_t double_desc   = { 11,  52, 0, NORMAL };
+/** Intel x87 extended precision */
+static const ieee_descriptor_t extended_desc = { 15,  63, 1, NORMAL };
+
+/** IEEE-754r quad precision */
+static const ieee_descriptor_t quad_desc     = { 15, 112, 0, NORMAL };
+
 /****************************************************************************
  *   private functions
  ****************************************************************************/
@@ -101,10 +127,9 @@ static void _fail_verify(tarval *tv, const char* file, int line)
 {
 	/* print a memory image of the tarval and throw an assertion */
 	if (tv)
-		printf("%s:%d: Invalid tarval:\n  mode: %s\n value: [%p]\n", file, line, get_mode_name(tv->mode), tv->value);
+		panic("%s:%d: Invalid tarval: mode: %F\n value: [%p]", file, line, tv->mode, tv->value);
 	else
-		printf("%s:%d: Invalid tarval (null)", file, line);
-	assert(0);
+		panic("%s:%d: Invalid tarval (null)", file, line);
 }
 #ifdef __GNUC__
 INLINE static void tarval_verify(tarval *tv) __attribute__ ((unused));
@@ -121,8 +146,6 @@ INLINE static void tarval_verify(tarval *tv)
 
 	if (!FIND_TARVAL(tv)) fail_verify(tv);
 	if (tv->length > 0 && !FIND_VALUE(tv->value, tv->length)) fail_verify(tv);
-
-	return;
 }
 #endif /* NDEBUG */
 
@@ -145,6 +168,29 @@ static int hash_val(const void *value, unsigned int length) {
 	return hash;
 }
 
+static int cmp_tv(const void *p1, const void *p2, size_t n) {
+	const tarval *tv1 = p1;
+	const tarval *tv2 = p2;
+	(void) n;
+
+	assert(tv1->kind == k_tarval);
+	assert(tv2->kind == k_tarval);
+	if (tv1->mode < tv2->mode)
+		return -1;
+	if (tv1->mode > tv2->mode)
+		return 1;
+	if (tv1->length < tv2->length)
+		return -1;
+	if (tv1->length > tv2->length)
+		return 1;
+	if (tv1->value < tv2->value)
+		return -1;
+	if (tv1->value > tv2->value)
+		return 1;
+
+	return 0;
+}
+
 /** finds tarval with value/mode or creates new tarval */
 static tarval *get_tarval(const void *value, int length, ir_mode *mode) {
 	tarval tv;
@@ -155,7 +201,12 @@ static tarval *get_tarval(const void *value, int length, ir_mode *mode) {
 	if (length > 0) {
 		/* if there already is such a value, it is returned, else value
 		 * is copied into the set */
-		tv.value = INSERT_VALUE(value, length);
+		char *temp = alloca(length);
+		memcpy(temp, value, length);
+		if (get_mode_arithmetic(mode) == irma_twos_complement) {
+			sign_extend(temp, mode);
+		}
+		tv.value = INSERT_VALUE(temp, length);
 	} else {
 		tv.value = value;
 	}
@@ -169,21 +220,30 @@ static tarval *get_tarval(const void *value, int length, ir_mode *mode) {
  */
 static tarval *get_tarval_overflow(const void *value, int length, ir_mode *mode)
 {
+	char *temp;
+
 	switch (get_mode_sort(mode)) {
+	case irms_reference:
+		/* addresses always wrap around */
+		temp = alloca(sc_get_buffer_length());
+		memcpy(temp, value, sc_get_buffer_length());
+		sc_truncate(get_mode_size_bits(mode), temp);
+		/* the sc_ module expects that all bits are set ... */
+		sign_extend(temp, mode);
+		return get_tarval(temp, length, mode);
+
 	case irms_int_number:
 		if (sc_comp(value, get_mode_max(mode)->value) == 1) {
 			switch (GET_OVERFLOW_MODE()) {
 			case TV_OVERFLOW_SATURATE:
 				return get_mode_max(mode);
 			case TV_OVERFLOW_WRAP:
-				{
-					char *temp = alloca(sc_get_buffer_length());
-					sc_val_from_ulong(-1, temp);
-					sc_and(temp, value, temp);
-					/* the sc_ module expects that all bits are set ... */
-					sign_extend(temp, mode);
-					return get_tarval(temp, length, mode);
-				}
+				temp = alloca(sc_get_buffer_length());
+				memcpy(temp, value, sc_get_buffer_length());
+				sc_truncate(get_mode_size_bits(mode), temp);
+				/* the sc_ module expects that all bits are set ... */
+				sign_extend(temp, mode);
+				return get_tarval(temp, length, mode);
 			case TV_OVERFLOW_BAD:
 				return tarval_bad;
 			default:
@@ -196,8 +256,8 @@ static tarval *get_tarval_overflow(const void *value, int length, ir_mode *mode)
 				return get_mode_min(mode);
 			case TV_OVERFLOW_WRAP: {
 				char *temp = alloca(sc_get_buffer_length());
-				sc_val_from_ulong(-1, temp);
-				sc_and(temp, value, temp);
+				memcpy(temp, value, sc_get_buffer_length());
+				sc_truncate(get_mode_size_bits(mode), temp);
 				return get_tarval(temp, length, mode);
 			}
 			case TV_OVERFLOW_BAD:
@@ -210,10 +270,12 @@ static tarval *get_tarval_overflow(const void *value, int length, ir_mode *mode)
 
 	case irms_float_number:
 		if (SWITCH_NOINFINITY && fc_is_inf(value)) {
-			return fc_is_negative(value)?get_mode_min(mode):get_mode_max(mode);
+			/* clip infinity to maximum value */
+			return fc_is_negative(value) ? get_mode_min(mode) : get_mode_max(mode);
 		}
 
 		if (SWITCH_NODENORMALS && fc_is_subnormal(value)) {
+			/* clip denormals to zero */
 			return get_mode_null(mode);
 		}
 		break;
@@ -227,12 +289,31 @@ static tarval *get_tarval_overflow(const void *value, int length, ir_mode *mode)
 /*
  *   public variables declared in tv.h
  */
-static tarval reserved_tv[4];
+static tarval reserved_tv[6];
+
+tarval *tarval_b_false     = &reserved_tv[0];
+tarval *tarval_b_true      = &reserved_tv[1];
+tarval *tarval_bad         = &reserved_tv[2];
+tarval *tarval_undefined   = &reserved_tv[3];
+tarval *tarval_reachable   = &reserved_tv[4];
+tarval *tarval_unreachable = &reserved_tv[5];
 
-tarval *tarval_bad       = &reserved_tv[0];
-tarval *tarval_undefined = &reserved_tv[1];
-tarval *tarval_b_false   = &reserved_tv[2];
-tarval *tarval_b_true    = &reserved_tv[3];
+/**
+ * get the float descriptor for given mode.
+ */
+static const ieee_descriptor_t *get_descriptor(const ir_mode *mode) {
+	switch (get_mode_size_bits(mode)) {
+	case 16:  return &half_desc;
+	case 32:  return &single_desc;
+	case 64:  return &double_desc;
+	case 80:
+	case 96:  return &extended_desc;
+	case 128: return &quad_desc;
+	default:
+		panic("Unsupported mode in get_descriptor()");
+		return NULL;
+	}
+}
 
 /*
  *   public functions declared in tv.h
@@ -243,6 +324,8 @@ tarval *tarval_b_true    = &reserved_tv[3];
  */
 tarval *new_tarval_from_str(const char *str, size_t len, ir_mode *mode)
 {
+	const ieee_descriptor_t *desc;
+
 	assert(str);
 	assert(len);
 	assert(mode);
@@ -251,41 +334,30 @@ tarval *new_tarval_from_str(const char *str, size_t len, ir_mode *mode)
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
-		assert(0);
-		break;
+		panic("Unsupported tarval creation with mode %F", mode);
 
 	case irms_internal_boolean:
 		/* match [tT][rR][uU][eE]|[fF][aA][lL][sS][eE] */
-		if (strcasecmp(str, "true")) return tarval_b_true;
-		else if (strcasecmp(str, "false")) return tarval_b_true;
+		if (strcasecmp(str, "true"))
+			return tarval_b_true;
+		else if (strcasecmp(str, "false"))
+			return tarval_b_true;
 		else
 			/* XXX This is C semantics */
 			return atoi(str) ? tarval_b_true : tarval_b_false;
 
 	case irms_float_number:
-		switch(get_mode_size_bits(mode)) {
-		case 32:
-			fc_val_from_str(str, len, 8, 23, NULL);
-			break;
-		case 64:
-			fc_val_from_str(str, len, 11, 52, NULL);
-			break;
-		case 80:
-			fc_val_from_str(str, len, 15, 64, NULL);
-			break;
-		}
+		desc = get_descriptor(mode);
+		fc_val_from_str(str, len, desc, NULL);
 		return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
 
-		case irms_reference:
-			/* same as integer modes */
-		case irms_int_number:
-		case irms_character:
-			sc_val_from_str(str, len, NULL, mode);
-			return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
+	case irms_reference:
+		/* same as integer modes */
+	case irms_int_number:
+		sc_val_from_str(str, len, NULL, mode);
+		return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
 	}
-
-	assert(0);  /* can't be reached, can it? */
-	return NULL;
+	panic("Unsupported tarval creation with mode %F", mode);
 }
 
 /*
@@ -294,7 +366,7 @@ tarval *new_tarval_from_str(const char *str, size_t len, ir_mode *mode)
 tarval *new_tarval_from_long(long l, ir_mode *mode) {
 	assert(mode);
 
-	switch(get_mode_sort(mode))   {
+	switch (get_mode_sort(mode))   {
 	case irms_internal_boolean:
 		/* XXX C semantics ! */
 		return l ? tarval_b_true : tarval_b_false ;
@@ -302,7 +374,6 @@ tarval *new_tarval_from_long(long l, ir_mode *mode) {
 	case irms_reference:
 		/* same as integer modes */
 	case irms_int_number:
-	case irms_character:
 		sc_val_from_long(l, NULL);
 		return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
 
@@ -317,11 +388,10 @@ tarval *new_tarval_from_long(long l, ir_mode *mode) {
 
 /* returns non-zero if can be converted to long */
 int tarval_is_long(tarval *tv) {
-	mode_sort sort = get_mode_sort(tv->mode);
-
-	if (sort != irms_int_number && sort != irms_character) return 0;
+	if (!mode_is_int(tv->mode) && !mode_is_reference(tv->mode))
+		return 0;
 
-	if (get_mode_size_bits(tv->mode) > (sizeof(long) << 3)) {
+	if (get_mode_size_bits(tv->mode) > (int) (sizeof(long) << 3)) {
 		/* the value might be too big to fit in a long */
 		sc_max_from_bits(sizeof(long) << 3, 0, NULL);
 		if (sc_comp(sc_get_buffer(), tv->value) == -1) {
@@ -340,19 +410,11 @@ long get_tarval_long(tarval* tv) {
 }
 
 tarval *new_tarval_from_double(long double d, ir_mode *mode) {
-	assert(mode && (get_mode_sort(mode) == irms_float_number));
+	const ieee_descriptor_t *desc;
 
-	switch (get_mode_size_bits(mode)) {
-	case 32:
-		fc_val_from_float(d, 8, 23, NULL);
-		break;
-	case 64:
-		fc_val_from_float(d, 11, 52, NULL);
-		break;
-	case 80:
-		fc_val_from_float(d, 15, 64, NULL);
-		break;
-	}
+	assert(mode && (get_mode_sort(mode) == irms_float_number));
+	desc = get_descriptor(mode);
+	fc_val_from_ieee754(d, desc, NULL);
 	return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
 }
 
@@ -366,7 +428,7 @@ int tarval_is_double(tarval *tv) {
 long double get_tarval_double(tarval *tv) {
 	assert(tarval_is_double(tv));
 
-	return fc_val_to_float(tv->value);
+	return fc_val_to_ieee754(tv->value);
 }
 
 
@@ -386,7 +448,7 @@ ir_mode *(get_tarval_mode)(const tarval *tv) {
  * value.
  * The functions get_mode_{Max,Min,...} return tarvals retrieved from these
  * functions, but these are stored on initialization of the irmode module and
- * therefore the irmode functions should be prefered to the functions below.
+ * therefore the irmode functions should be preferred to the functions below.
  */
 
 tarval *(get_tarval_bad)(void) {
@@ -405,90 +467,78 @@ tarval *(get_tarval_b_true)(void) {
 	return _get_tarval_b_true();
 }
 
+tarval *(get_tarval_reachable)(void) {
+	return _get_tarval_reachable();
+}
+
+tarval *(get_tarval_unreachable)(void) {
+	return _get_tarval_unreachable();
+}
+
 tarval *get_tarval_max(ir_mode *mode) {
-	assert(mode);
+	const ieee_descriptor_t *desc;
 
+	assert(mode);
 	if (get_mode_n_vector_elems(mode) > 1) {
 		/* vector arithmetic not implemented yet */
 		return tarval_bad;
 	}
 
-	switch(get_mode_sort(mode)) {
-	case irms_reference:
+	switch (get_mode_sort(mode)) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
-		assert(0);
-		break;
+		panic("mode %F does not support maximum value", mode);
 
 	case irms_internal_boolean:
 		return tarval_b_true;
 
 	case irms_float_number:
-		switch(get_mode_size_bits(mode)) {
-		case 32:
-			fc_get_max(8, 23, NULL);
-			break;
-		case 64:
-			fc_get_max(11, 52, NULL);
-			break;
-		case 80:
-			fc_get_max(15, 64, NULL);
-			break;
-		}
+		desc = get_descriptor(mode);
+		fc_get_max(desc, NULL);
 		return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
 
-		case irms_int_number:
-		case irms_character:
-			sc_max_from_bits(get_mode_size_bits(mode), mode_is_signed(mode), NULL);
-			return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
+	case irms_reference:
+	case irms_int_number:
+		sc_max_from_bits(get_mode_size_bits(mode), mode_is_signed(mode), NULL);
+		return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
 	}
 	return tarval_bad;
 }
 
 tarval *get_tarval_min(ir_mode *mode) {
-	assert(mode);
+	const ieee_descriptor_t *desc;
 
+	assert(mode);
 	if (get_mode_n_vector_elems(mode) > 1) {
 		/* vector arithmetic not implemented yet */
 		return tarval_bad;
 	}
 
-	switch(get_mode_sort(mode)) {
-	case irms_reference:
+	switch (get_mode_sort(mode)) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
-		assert(0);
-		break;
+		panic("mode %F does not support minimum value", mode);
 
 	case irms_internal_boolean:
 		return tarval_b_false;
 
 	case irms_float_number:
-		switch(get_mode_size_bits(mode)) {
-		case 32:
-			fc_get_min(8, 23, NULL);
-			break;
-		case 64:
-			fc_get_min(11, 52, NULL);
-			break;
-		case 80:
-			fc_get_min(15, 64, NULL);
-			break;
-		}
+		desc = get_descriptor(mode);
+		fc_get_min(desc, NULL);
 		return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
 
-		case irms_int_number:
-		case irms_character:
-			sc_min_from_bits(get_mode_size_bits(mode), mode_is_signed(mode), NULL);
-			return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
+	case irms_reference:
+	case irms_int_number:
+		sc_min_from_bits(get_mode_size_bits(mode), mode_is_signed(mode), NULL);
+		return get_tarval(sc_get_buffer(), sc_get_buffer_length(), mode);
 	}
 	return tarval_bad;
 }
 
 /** The bit pattern for the pointer NULL */
-static long _null_value;
+static long _null_value = 0;
 
 tarval *get_tarval_null(ir_mode *mode) {
 	assert(mode);
@@ -498,19 +548,17 @@ tarval *get_tarval_null(ir_mode *mode) {
 		return tarval_bad;
 	}
 
-	switch(get_mode_sort(mode)) {
+	switch (get_mode_sort(mode)) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
-	case irms_internal_boolean:
-		assert(0);
-		break;
+		panic("mode %F does not support null value", mode);
 
 	case irms_float_number:
 		return new_tarval_from_double(0.0, mode);
 
+	case irms_internal_boolean:
 	case irms_int_number:
-	case irms_character:
 		return new_tarval_from_long(0l,  mode);
 
 	case irms_reference:
@@ -522,141 +570,129 @@ tarval *get_tarval_null(ir_mode *mode) {
 tarval *get_tarval_one(ir_mode *mode) {
 	assert(mode);
 
-	if (get_mode_n_vector_elems(mode) > 1) {
-		/* vector arithmetic not implemented yet */
-		return tarval_bad;
-	}
+	if (get_mode_n_vector_elems(mode) > 1)
+		panic("vector arithmetic not implemented yet");
 
-	switch(get_mode_sort(mode)) {
+	switch (get_mode_sort(mode)) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
+		panic("mode %F does not support one value", mode);
+
 	case irms_internal_boolean:
-	case irms_reference:
-		assert(0);
-		break;
+		return tarval_b_true;
 
 	case irms_float_number:
 		return new_tarval_from_double(1.0, mode);
 
+	case irms_reference:
 	case irms_int_number:
-	case irms_character:
 		return new_tarval_from_long(1l, mode);
-		break;
 	}
 	return tarval_bad;
 }
 
-tarval *get_tarval_minus_one(ir_mode *mode) {
+tarval *get_tarval_all_one(ir_mode *mode) {
 	assert(mode);
 
-	if (get_mode_n_vector_elems(mode) > 1) {
-		/* vector arithmetic not implemented yet */
-		return tarval_bad;
+	if (get_mode_n_vector_elems(mode) > 1)
+		panic("vector arithmetic not implemented yet");
+
+	switch (get_mode_sort(mode)) {
+	case irms_control_flow:
+	case irms_memory:
+	case irms_auxiliary:
+		panic("mode %F does not support all-one value", mode);
+
+	case irms_int_number:
+	case irms_internal_boolean:
+	case irms_reference:
+		return tarval_not(get_mode_null(mode));
+
+
+	case irms_float_number:
+		return new_tarval_from_double(1.0, mode);
 	}
+	return tarval_bad;
+}
+
+int tarval_is_constant(tarval *tv) {
+	int num_res = sizeof(reserved_tv) / sizeof(reserved_tv[0]);
+
+	/* reserved tarvals are NOT constants. Note that although
+	   tarval_b_true and tarval_b_false are reserved, they are constants of course. */
+	return (tv < &reserved_tv[2] || tv > &reserved_tv[num_res - 1]);
+}
+
+tarval *get_tarval_minus_one(ir_mode *mode) {
+	assert(mode);
+
+	if (get_mode_n_vector_elems(mode) > 1)
+		panic("vector arithmetic not implemented yet");
 
-	switch(get_mode_sort(mode)) {
+	switch (get_mode_sort(mode)) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
 	case irms_internal_boolean:
+		panic("mode %F does not support minus one value", mode);
+
 	case irms_reference:
-		assert(0);
-		break;
+		return tarval_bad;
 
 	case irms_float_number:
 		return mode_is_signed(mode) ? new_tarval_from_double(-1.0, mode) : tarval_bad;
 
 	case irms_int_number:
-	case irms_character:
-		return mode_is_signed(mode) ? new_tarval_from_long(-1l, mode) : tarval_bad;
+		return new_tarval_from_long(-1l, mode);
 	}
 	return tarval_bad;
 }
 
 tarval *get_tarval_nan(ir_mode *mode) {
-	assert(mode);
+	const ieee_descriptor_t *desc;
 
-	if (get_mode_n_vector_elems(mode) > 1) {
-		/* vector arithmetic not implemented yet */
-		return tarval_bad;
-	}
+	assert(mode);
+	if (get_mode_n_vector_elems(mode) > 1)
+		panic("vector arithmetic not implemented yet");
 
 	if (get_mode_sort(mode) == irms_float_number) {
-		switch(get_mode_size_bits(mode)) {
-		case 32:
-			fc_get_qnan(8, 23, NULL);
-			break;
-		case 64:
-			fc_get_qnan(11, 52, NULL);
-			break;
-		case 80:
-			fc_get_qnan(15, 64, NULL);
-			break;
-		}
+		desc = get_descriptor(mode);
+		fc_get_qnan(desc, NULL);
 		return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
-	} else {
-		assert(0 && "tarval is not floating point");
-		return tarval_bad;
-	}
+	} else
+		panic("mode %F does not support NaN value", mode);
 }
 
 tarval *get_tarval_plus_inf(ir_mode *mode) {
 	assert(mode);
-
-	if (get_mode_n_vector_elems(mode) > 1) {
-		/* vector arithmetic not implemented yet */
-		return tarval_bad;
-	}
+	if (get_mode_n_vector_elems(mode) > 1)
+		panic("vector arithmetic not implemented yet");
 
 	if (get_mode_sort(mode) == irms_float_number) {
-		switch(get_mode_size_bits(mode)) {
-		case 32:
-			fc_get_plusinf(8, 23, NULL);
-			break;
-		case 64:
-			fc_get_plusinf(11, 52, NULL);
-			break;
-		case 80:
-			fc_get_plusinf(15, 64, NULL);
-			break;
-		}
+		const ieee_descriptor_t *desc = get_descriptor(mode);
+		fc_get_plusinf(desc, NULL);
 		return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
-	} else {
-		assert(0 && "tarval is not floating point");
-		return tarval_bad;
-	}
+	} else
+		panic("mode %F does not support +inf value", mode);
 }
 
 tarval *get_tarval_minus_inf(ir_mode *mode) {
 	assert(mode);
 
-	if (get_mode_n_vector_elems(mode) > 1) {
-		/* vector arithmetic not implemented yet */
-		return tarval_bad;
-	}
+	if (get_mode_n_vector_elems(mode) > 1)
+		panic("vector arithmetic not implemented yet");
 
 	if (get_mode_sort(mode) == irms_float_number) {
-		switch(get_mode_size_bits(mode)) {
-		case 32:
-			fc_get_minusinf(8, 23, NULL);
-			break;
-		case 64:
-			fc_get_minusinf(11, 52, NULL);
-			break;
-		case 80:
-			fc_get_minusinf(15, 64, NULL);
-			break;
-		}
+		const ieee_descriptor_t *desc = get_descriptor(mode);
+		fc_get_minusinf(desc, NULL);
 		return get_tarval(fc_get_buffer(), fc_get_buffer_length(), mode);
-	} else {
-		assert(0 && "tarval is not floating point");
-		return tarval_bad;
-	}
+	} else
+		panic("mode %F does not support -inf value", mode);
 }
 
 /*
- * Arithmethic operations on tarvals ========================================
+ * Arithmetic operations on tarvals ========================================
  */
 
 /*
@@ -665,11 +701,8 @@ tarval *get_tarval_minus_inf(ir_mode *mode) {
 int tarval_is_negative(tarval *a) {
 	assert(a);
 
-	if (get_mode_n_vector_elems(a->mode) > 1) {
-		/* vector arithmetic not implemented yet */
-		assert(0 && "tarval_is_negative is not allowed for vector modes");
-		return 0;
-	}
+	if (get_mode_n_vector_elems(a->mode) > 1)
+		panic("vector arithmetic not implemented yet");
 
 	switch (get_mode_sort(a->mode)) {
 	case irms_int_number:
@@ -678,11 +711,10 @@ int tarval_is_negative(tarval *a) {
 			return sc_comp(a->value, get_mode_null(a->mode)->value) == -1 ? 1 : 0;
 
 	case irms_float_number:
-		return fc_comp(a->value, get_mode_null(a->mode)->value) == -1 ? 1 : 0;
+		return fc_is_negative(a->value);
 
 	default:
-		assert(0 && "not implemented");
-		return 0;
+		panic("mode %F does not support negation value", a->mode);
 	}
 }
 
@@ -690,18 +722,33 @@ int tarval_is_negative(tarval *a) {
  * test if null, 1 means 'yes'
  */
 int tarval_is_null(tarval *a) {
-	ir_mode *m = get_tarval_mode(a);
-
-	return a == get_tarval_null(m);
+	return
+		a != tarval_bad &&
+		a == get_mode_null(get_tarval_mode(a));
 }
 
 /*
  * test if one, 1 means 'yes'
  */
 int tarval_is_one(tarval *a) {
-	ir_mode *m = get_tarval_mode(a);
+	return
+		a != tarval_bad &&
+		a == get_mode_one(get_tarval_mode(a));
+}
+
+int tarval_is_all_one(tarval *tv) {
+	return
+		tv != tarval_bad &&
+		tv == get_mode_all_one(get_tarval_mode(tv));
+}
 
-	return a == get_tarval_one(m);
+/*
+ * test if one, 1 means 'yes'
+ */
+int tarval_is_minus_one(tarval *a) {
+	return
+		a != tarval_bad &&
+		a == get_mode_minus_one(get_tarval_mode(a));
 }
 
 /*
@@ -712,7 +759,7 @@ pn_Cmp tarval_cmp(tarval *a, tarval *b) {
 	assert(b);
 
 	if (a == tarval_bad || b == tarval_bad) {
-		assert(0 && "Comparison with tarval_bad");
+		panic("Comparison with tarval_bad");
 		return pn_Cmp_False;
 	}
 
@@ -732,12 +779,14 @@ pn_Cmp tarval_cmp(tarval *a, tarval *b) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
-	case irms_reference:
 		if (a == b)
 			return pn_Cmp_Eq;
 		return pn_Cmp_False;
 
 	case irms_float_number:
+		/* it should be safe to enable this even if other arithmetic is disabled */
+		/*if (no_float)
+			return pn_Cmp_False;*/
 		/*
 		 * BEWARE: we cannot compare a == b here, because
 		 * a NaN is always Unordered to any other value, even to itself!
@@ -749,8 +798,8 @@ pn_Cmp tarval_cmp(tarval *a, tarval *b) {
 		case  2: return pn_Cmp_Uo;
 		default: return pn_Cmp_False;
 		}
+	case irms_reference:
 	case irms_int_number:
-	case irms_character:
 		if (a == b)
 			return pn_Cmp_Eq;
 		return sc_comp(a->value, b->value) == 1 ? pn_Cmp_Gt : pn_Cmp_Lt;
@@ -766,13 +815,16 @@ pn_Cmp tarval_cmp(tarval *a, tarval *b) {
 /*
  * convert to other mode
  */
-tarval *tarval_convert_to(tarval *src, ir_mode *m) {
-	char *buffer;
+tarval *tarval_convert_to(tarval *src, ir_mode *dst_mode) {
+	char                    *buffer;
+	fp_value                *res;
+	const ieee_descriptor_t *desc;
 
 	assert(src);
-	assert(m);
+	assert(dst_mode);
 
-	if (src->mode == m) return src;
+	if (src->mode == dst_mode)
+		return src;
 
 	if (get_mode_n_vector_elems(src->mode) > 1) {
 		/* vector arithmetic not implemented yet */
@@ -787,40 +839,28 @@ tarval *tarval_convert_to(tarval *src, ir_mode *m) {
 
 		/* cast float to something */
 	case irms_float_number:
-		switch (get_mode_sort(m)) {
+		switch (get_mode_sort(dst_mode)) {
 		case irms_float_number:
-			switch (get_mode_size_bits(m)) {
-			case 32:
-				fc_cast(src->value, 8, 23, NULL);
-				break;
-			case 64:
-				fc_cast(src->value, 11, 52, NULL);
-				break;
-			case 80:
-				fc_cast(src->value, 15, 64, NULL);
-				break;
-			default:
-				break;
-			}
-			return get_tarval(fc_get_buffer(), fc_get_buffer_length(), m);
+			desc = get_descriptor(dst_mode);
+			fc_cast(src->value, desc, NULL);
+			return get_tarval(fc_get_buffer(), fc_get_buffer_length(), dst_mode);
 
 		case irms_int_number:
 			switch (GET_FLOAT_TO_INT_MODE()) {
 			case TRUNCATE:
-				fc_int(src->value, NULL);
+				res = fc_int(src->value, NULL);
 				break;
 			case ROUND:
-				fc_rnd(src->value, NULL);
+				res = fc_rnd(src->value, NULL);
 				break;
 			default:
-				assert(0);
+				panic("Unsupported float to int conversion mode in tarval_convert_to()");
 				break;
 			}
-			/* FIXME: floating point unit can't produce a value in integer
-			 * representation
-			 * an intermediate representation is needed here first. */
-			/*  return get_tarval(); */
-			return tarval_bad;
+			buffer = alloca(sc_get_buffer_length());
+			if (! fc_flt2int(res, buffer, dst_mode))
+				return tarval_bad;
+			return get_tarval(buffer, sc_get_buffer_length(), dst_mode);
 
 		default:
 			/* the rest can't be converted */
@@ -830,14 +870,14 @@ tarval *tarval_convert_to(tarval *src, ir_mode *m) {
 
 	/* cast int/characters to something */
 	case irms_int_number:
-	case irms_character:
-		switch (get_mode_sort(m)) {
+		switch (get_mode_sort(dst_mode)) {
+
+		case irms_reference:
 		case irms_int_number:
-		case irms_character:
 			buffer = alloca(sc_get_buffer_length());
 			memcpy(buffer, src->value, sc_get_buffer_length());
-			sign_extend(buffer, src->mode);
-			return get_tarval_overflow(buffer, src->length, m);
+			sign_extend(buffer, dst_mode);
+			return get_tarval_overflow(buffer, src->length, dst_mode);
 
 		case irms_internal_boolean:
 			/* XXX C semantics */
@@ -854,24 +894,9 @@ tarval *tarval_convert_to(tarval *src, ir_mode *m) {
 			snprintf(buffer, 100, "%s",
 				sc_print(src->value, get_mode_size_bits(src->mode), SC_DEC, mode_is_signed(src->mode)));
 			buffer[100 - 1] = '\0';
-			switch (get_mode_size_bits(m)) {
-			case 32:
-				fc_val_from_str(buffer, 0, 8, 23, NULL);
-				break;
-			case 64:
-				fc_val_from_str(buffer, 0, 11, 52, NULL);
-				break;
-			case 80:
-				fc_val_from_str(buffer, 0, 15, 64, NULL);
-				break;
-			}
-			return get_tarval(fc_get_buffer(), fc_get_buffer_length(), m);
-
-		case irms_reference:
-			/* allow 0 to be casted */
-			if (src == get_mode_null(src->mode))
-				return get_mode_null(m);
-			break;
+			desc = get_descriptor(dst_mode);
+			fc_val_from_str(buffer, 0, desc, NULL);
+			return get_tarval(fc_get_buffer(), fc_get_buffer_length(), dst_mode);
 
 		default:
 			break;
@@ -879,17 +904,18 @@ tarval *tarval_convert_to(tarval *src, ir_mode *m) {
 		break;
 
 	case irms_internal_boolean:
-		switch (get_mode_sort(m)) {
-		case irms_int_number:
-			if (src == tarval_b_true) return get_mode_one(m);
-			else return get_mode_null(m);
-
-		default:
-			break;
-		}
+		/* beware: this is C semantic for the INTERNAL boolean mode */
+		if (get_mode_sort(dst_mode) == irms_int_number)
+			return src == tarval_b_true ? get_mode_one(dst_mode) : get_mode_null(dst_mode);
 		break;
 
 	case irms_reference:
+		if (get_mode_sort(dst_mode) == irms_int_number) {
+			buffer = alloca(sc_get_buffer_length());
+			memcpy(buffer, src->value, sc_get_buffer_length());
+			sign_extend(buffer, src->mode);
+			return get_tarval_overflow(buffer, src->length, dst_mode);
+		}
 		break;
 	}
 
@@ -907,6 +933,7 @@ tarval *tarval_not(tarval *a) {
 	/* works for vector mode without changes */
 
 	switch (get_mode_sort(a->mode)) {
+	case irms_reference:
 	case irms_int_number:
 		buffer = alloca(sc_get_buffer_length());
 		sc_not(a->value, buffer);
@@ -948,6 +975,10 @@ tarval *tarval_neg(tarval *a) {
 		return get_tarval_overflow(buffer, a->length, a->mode);
 
 	case irms_float_number:
+		/* it should be safe to enable this even if other arithmetic is disabled */
+		/*if (no_float)
+			return tarval_bad;*/
+
 		fc_neg(a->value, NULL);
 		return get_tarval_overflow(fc_get_buffer(), fc_get_buffer_length(), a->mode);
 
@@ -964,15 +995,22 @@ tarval *tarval_add(tarval *a, tarval *b) {
 
 	assert(a);
 	assert(b);
-	assert(a->mode == b->mode);
 
 	if (get_mode_n_vector_elems(a->mode) > 1 || get_mode_n_vector_elems(b->mode) > 1) {
 		/* vector arithmetic not implemented yet */
 		return tarval_bad;
 	}
 
+	if (mode_is_reference(a->mode) && a->mode != b->mode) {
+		b = tarval_convert_to(b, a->mode);
+	} else if (mode_is_reference(b->mode) && b->mode != a->mode) {
+		a = tarval_convert_to(a, b->mode);
+	}
+
+	assert(a->mode == b->mode);
+
 	switch (get_mode_sort(a->mode)) {
-	case irms_character:
+	case irms_reference:
 	case irms_int_number:
 		/* modes of a,b are equal, so result has mode of a as this might be the character */
 		buffer = alloca(sc_get_buffer_length());
@@ -980,6 +1018,9 @@ tarval *tarval_add(tarval *a, tarval *b) {
 		return get_tarval_overflow(buffer, a->length, a->mode);
 
 	case irms_float_number:
+		if (no_float)
+			return tarval_bad;
+
 		fc_add(a->value, b->value, NULL);
 		return get_tarval_overflow(fc_get_buffer(), fc_get_buffer_length(), a->mode);
 
@@ -991,19 +1032,27 @@ tarval *tarval_add(tarval *a, tarval *b) {
 /*
  * subtraction
  */
-tarval *tarval_sub(tarval *a, tarval *b) {
-	char *buffer;
+tarval *tarval_sub(tarval *a, tarval *b, ir_mode *dst_mode) {
+	char    *buffer;
 
 	assert(a);
 	assert(b);
-	assert(a->mode == b->mode);
 
 	if (get_mode_n_vector_elems(a->mode) > 1 || get_mode_n_vector_elems(b->mode) > 1) {
 		/* vector arithmetic not implemented yet */
 		return tarval_bad;
 	}
+
+	if (dst_mode != NULL) {
+		if (a->mode != dst_mode)
+			a = tarval_convert_to(a, dst_mode);
+		if (b->mode != dst_mode)
+			b = tarval_convert_to(b, dst_mode);
+	}
+	assert(a->mode == b->mode);
+
 	switch (get_mode_sort(a->mode)) {
-	case irms_character:
+	case irms_reference:
 	case irms_int_number:
 		/* modes of a,b are equal, so result has mode of a as this might be the character */
 		buffer = alloca(sc_get_buffer_length());
@@ -1011,6 +1060,9 @@ tarval *tarval_sub(tarval *a, tarval *b) {
 		return get_tarval_overflow(buffer, a->length, a->mode);
 
 	case irms_float_number:
+		if (no_float)
+			return tarval_bad;
+
 		fc_sub(a->value, b->value, NULL);
 		return get_tarval_overflow(fc_get_buffer(), fc_get_buffer_length(), a->mode);
 
@@ -1042,6 +1094,9 @@ tarval *tarval_mul(tarval *a, tarval *b) {
 		return get_tarval_overflow(buffer, a->length, a->mode);
 
 	case irms_float_number:
+		if (no_float)
+			return tarval_bad;
+
 		fc_mul(a->value, b->value, NULL);
 		return get_tarval_overflow(fc_get_buffer(), fc_get_buffer_length(), a->mode);
 
@@ -1058,6 +1113,9 @@ tarval *tarval_quo(tarval *a, tarval *b) {
 	assert(b);
 	assert((a->mode == b->mode) && mode_is_float(a->mode));
 
+	if (no_float)
+		return tarval_bad;
+
 	if (get_mode_n_vector_elems(a->mode) > 1) {
 		/* vector arithmetic not implemented yet */
 		return tarval_bad;
@@ -1109,6 +1167,33 @@ tarval *tarval_mod(tarval *a, tarval *b) {
 	return get_tarval(sc_get_buffer(), sc_get_buffer_length(), a->mode);
 }
 
+/*
+ * integer division AND remainder
+ * overflow is impossible, but look out for division by zero
+ */
+tarval *tarval_divmod(tarval *a, tarval *b, tarval **mod) {
+	int len = sc_get_buffer_length();
+	char *div_res = alloca(len);
+	char *mod_res = alloca(len);
+
+	assert(a);
+	assert(b);
+	assert((a->mode == b->mode) && mode_is_int(a->mode));
+
+	if (get_mode_n_vector_elems(a->mode) > 1) {
+		/* vector arithmetic not implemented yet */
+		return tarval_bad;
+	}
+
+
+	/* x/0 error */
+	if (b == get_mode_null(b->mode)) return tarval_bad;
+	/* modes of a,b are equal */
+	sc_divmod(a->value, b->value, div_res, mod_res);
+	*mod = get_tarval(mod_res, len, a->mode);
+	return get_tarval(div_res, len, a->mode);
+}
+
 /*
  * absolute value
  */
@@ -1133,6 +1218,10 @@ tarval *tarval_abs(tarval *a) {
 		return a;
 
 	case irms_float_number:
+		/* it should be safe to enable this even if other arithmetic is disabled */
+		/*if (no_float)
+			return tarval_bad;*/
+
 		if (fc_comp(a->value, get_mode_null(a->mode)->value) == -1) {
 			fc_neg(a->value, NULL);
 			return get_tarval_overflow(fc_get_buffer(), fc_get_buffer_length(), a->mode);
@@ -1155,7 +1244,7 @@ tarval *tarval_and(tarval *a, tarval *b) {
 
 	/* works even for vector modes */
 
-	switch(get_mode_sort(a->mode)) {
+	switch (get_mode_sort(a->mode)) {
 	case irms_internal_boolean:
 		return (a == tarval_b_false) ? a : b;
 
@@ -1172,7 +1261,7 @@ tarval *tarval_and(tarval *a, tarval *b) {
 /*
  * bitwise or
  */
-tarval *tarval_or (tarval *a, tarval *b) {
+tarval *tarval_or(tarval *a, tarval *b) {
 	assert(a);
 	assert(b);
 	assert(a->mode == b->mode);
@@ -1299,9 +1388,9 @@ tarval *tarval_shrs(tarval *a, tarval *b) {
 }
 
 /*
- * bitwise rotation
+ * bitwise rotation to left
  */
-tarval *tarval_rot(tarval *a, tarval *b) {
+tarval *tarval_rotl(tarval *a, tarval *b) {
 	char *temp_val = NULL;
 
 	assert(a);
@@ -1321,7 +1410,7 @@ tarval *tarval_rot(tarval *a, tarval *b) {
 	} else
 		temp_val = (char*)b->value;
 
-	sc_rot(a->value, temp_val, get_mode_size_bits(a->mode), mode_is_signed(a->mode), NULL);
+	sc_rotl(a->value, temp_val, get_mode_size_bits(a->mode), mode_is_signed(a->mode), NULL);
 	return get_tarval(sc_get_buffer(), sc_get_buffer_length(), a->mode);
 }
 
@@ -1329,6 +1418,7 @@ tarval *tarval_rot(tarval *a, tarval *b) {
  * carry flag of the last operation
  */
 int tarval_carry(void) {
+	panic("tarval_carry() requetsed: not implemented on all operations");
 	return sc_had_carry();
 }
 
@@ -1354,7 +1444,6 @@ int tarval_snprintf(char *buf, size_t len, tarval *tv) {
 		if (tv == tv->mode->null) return snprintf(buf, len, "NULL");
 		/* fall through */
 	case irms_int_number:
-	case irms_character:
 		switch (mode_info->mode_output) {
 
 		case TVO_DECIMAL:
@@ -1405,7 +1494,15 @@ int tarval_snprintf(char *buf, size_t len, tarval *tv) {
 	case irms_control_flow:
 	case irms_memory:
 	case irms_auxiliary:
-		return snprintf(buf, len, "<TV_OVERFLOW_BAD>");
+		if (tv == tarval_bad)
+			return snprintf(buf, len, "<TV_BAD>");
+		if (tv == tarval_undefined)
+			return snprintf(buf, len, "<TV_UNDEF>");
+		if (tv == tarval_unreachable)
+			return snprintf(buf, len, "<TV_UNREACHABLE>");
+		if (tv == tarval_reachable)
+			return snprintf(buf, len, "<TV_REACHABLE>");
+		return snprintf(buf, len, "<TV_??""?>");
 	}
 
 	return 0;
@@ -1419,7 +1516,7 @@ int tarval_printf(tarval *tv) {
 	int res;
 
 	res = tarval_snprintf(buf, sizeof(buf), tv);
-	assert(res < sizeof(buf) && "buffer to small for tarval_snprintf");
+	assert(res < (int) sizeof(buf) && "buffer to small for tarval_snprintf");
 	printf(buf);
 	return res;
 }
@@ -1428,7 +1525,7 @@ char *get_tarval_bitpattern(tarval *tv) {
 	int i, j, pos = 0;
 	int n = get_mode_size_bits(tv->mode);
 	int bytes = (n + 7) / 8;
-	char *res = xmalloc((n + 1) * sizeof(char));
+	char *res = XMALLOCN(char, n + 1);
 	unsigned char byte;
 
 	for(i = 0; i < bytes; i++) {
@@ -1447,16 +1544,13 @@ char *get_tarval_bitpattern(tarval *tv) {
  * access to the bitpattern
  */
 unsigned char get_tarval_sub_bits(tarval *tv, unsigned byte_ofs) {
-	switch (get_mode_sort(tv->mode)) {
-	case irms_int_number:
-	case irms_character:
-		return sc_sub_bits(tv->value, tv->length, byte_ofs);
-
-	case irms_float_number:
+	switch (get_mode_arithmetic(tv->mode)) {
+	case irma_twos_complement:
+		return sc_sub_bits(tv->value, get_mode_size_bits(tv->mode), byte_ofs);
+	case irma_ieee754:
 		return fc_sub_bits(tv->value, get_mode_size_bits(tv->mode), byte_ofs);
-
 	default:
-		return 0;
+		panic("get_tarval_sub_bits(): arithmetic mode not supported");
 	}
 }
 
@@ -1485,34 +1579,11 @@ const tarval_mode_info *get_tarval_mode_output_option(ir_mode *mode) {
 	return mode->tv_priv;
 }
 
-/*
- * Identifying tarvals values for algebraic simplifications.
- *
- * Returns:
- *   - TV_CLASSIFY_NULL    for additive neutral or the NULL tarval for reference modes,
- *   - TV_CLASSIFY_ONE     for multiplicative neutral,
- *   - TV_CLASSIFY_ALL_ONE for bitwise-and neutral
- *   - TV_CLASSIFY_OTHER   else
- */
-tarval_classification_t classify_tarval(tarval *tv) {
-	if (!tv || tv == tarval_bad) return TV_CLASSIFY_OTHER;
-
-	if (tv == get_mode_null(tv->mode))
-		return TV_CLASSIFY_NULL;
-	else if (tv == get_mode_one(tv->mode))
-		return TV_CLASSIFY_ONE;
-	else if ((get_mode_sort(tv->mode) == irms_int_number)
-		&& (tv == new_tarval_from_long(-1, tv->mode)))
-		return TV_CLASSIFY_ALL_ONE;
-
-	return TV_CLASSIFY_OTHER;
-}
-
 /*
  * Returns non-zero if a given (integer) tarval has only one single bit
  * set.
  */
-int is_single_bit_tarval(tarval *tv) {
+int tarval_is_single_bit(tarval *tv) {
 	int i, l;
 	int bits;
 
@@ -1534,6 +1605,79 @@ int is_single_bit_tarval(tarval *tv) {
 	return bits;
 }
 
+/*
+ * Returns non-zero if the mantissa of a floating point IEEE-754
+ * tarval is zero (i.e. 1.0Exxx)
+ */
+int tarval_ieee754_zero_mantissa(tarval *tv) {
+	assert(get_mode_arithmetic(tv->mode) == irma_ieee754);
+	return fc_zero_mantissa(tv->value);
+}
+
+/* Returns the exponent of a floating point IEEE-754 tarval. */
+int tarval_ieee754_get_exponent(tarval *tv) {
+	assert(get_mode_arithmetic(tv->mode) == irma_ieee754);
+	return fc_get_exponent(tv->value);
+}
+
+/*
+ * Check if the tarval can be converted to the given mode without
+ * precision loss.
+ */
+int tarval_ieee754_can_conv_lossless(tarval *tv, ir_mode *mode) {
+	const ieee_descriptor_t *desc = get_descriptor(mode);
+	return fc_can_lossless_conv_to(tv->value, desc);
+}
+
+/* Set the immediate precision for IEEE-754 results. */
+unsigned tarval_ieee754_set_immediate_precision(unsigned bits) {
+	return fc_set_immediate_precision(bits);
+}
+
+/* Returns non-zero if the result of the last IEEE-754 operation was exact. */
+unsigned tarval_ieee754_get_exact(void) {
+	return fc_is_exact();
+}
+
+/* Return the size of the mantissa in bits (including possible
+   implicit bits) for the given mode. */
+unsigned tarval_ieee754_get_mantissa_size(const ir_mode *mode) {
+	const ieee_descriptor_t *desc;
+
+	assert(get_mode_arithmetic(mode) == irma_ieee754);
+	desc = get_descriptor(mode);
+
+	return desc->mantissa_size + desc->explicit_one;
+}
+
+/* check if its the a floating point NaN */
+int tarval_is_NaN(tarval *tv) {
+	if (! mode_is_float(tv->mode))
+		return 0;
+	return fc_is_nan(tv->value);
+}
+
+/* check if its the a floating point +inf */
+int tarval_is_plus_inf(tarval *tv) {
+	if (! mode_is_float(tv->mode))
+		return 0;
+	return fc_is_inf(tv->value) && !fc_is_negative(tv->value);
+}
+
+/* check if its the a floating point -inf */
+int tarval_is_minus_inf(tarval *tv) {
+	if (! mode_is_float(tv->mode))
+		return 0;
+	return fc_is_inf(tv->value) && fc_is_negative(tv->value);
+}
+
+/* check if the tarval represents a finite value */
+int tarval_is_finite(tarval *tv) {
+	if (mode_is_float(tv->mode))
+		return !fc_is_nan(tv->value) && !fc_is_inf(tv->value);
+	return 1;
+}
+
 /*
  * Sets the overflow mode for integer operations.
  */
@@ -1541,13 +1685,19 @@ void tarval_set_integer_overflow_mode(tarval_int_overflow_mode_t ov_mode) {
 	int_overflow_mode = ov_mode;
 }
 
-/**
- * Get the overflow mode for integer operations.
- */
+/* Get the overflow mode for integer operations. */
 tarval_int_overflow_mode_t tarval_get_integer_overflow_mode(void) {
 	return int_overflow_mode;
 }
 
+/* Enable/Disable floating point constant folding. */
+int tarval_enable_fp_ops(int enable) {
+	int old = !no_float;
+
+	no_float = !enable;
+	return old;
+}
+
 /**
  * default mode_info for output as HEX
  */
@@ -1560,45 +1710,53 @@ static const tarval_mode_info hex_output = {
 /*
  * Initialization of the tarval module: called before init_mode()
  */
-void init_tarval_1(long null_value) {
+void init_tarval_1(long null_value, int support_quad_precision) {
+	/* if these assertion fail, tarval_is_constant() will follow ... */
+	assert(tarval_b_false == &reserved_tv[0] && "b_false MUST be the first reserved tarval!");
+	assert(tarval_b_true  == &reserved_tv[1] && "b_true MUST be the second reserved tarval!");
+
 	_null_value = null_value;
 
 	/* initialize the sets holding the tarvals with a comparison function and
 	 * an initial size, which is the expected number of constants */
-	tarvals = new_set(memcmp, N_CONSTANTS);
+	tarvals = new_set(cmp_tv, N_CONSTANTS);
 	values  = new_set(memcmp, N_CONSTANTS);
-	/* init strcalc with precision of 68 to support floating point values with 64
-	 * bit mantissa (needs extra bits for rounding and overflow) */
-	init_strcalc(68);
-	init_fltcalc(0);
+	/* calls init_strcalc() with needed size */
+	init_fltcalc(support_quad_precision ? 112 : 64);
 }
 
 /*
  * Initialization of the tarval module: called after init_mode()
  */
 void init_tarval_2(void) {
-	tarval_bad->kind        = k_tarval;
-	tarval_bad->mode        = mode_BAD;
-	tarval_bad->value       = INT_TO_PTR(resid_tarval_bad);
+	tarval_bad->kind          = k_tarval;
+	tarval_bad->mode          = mode_BAD;
+	tarval_bad->value         = INT_TO_PTR(resid_tarval_bad);
+
+	tarval_undefined->kind    = k_tarval;
+	tarval_undefined->mode    = mode_ANY;
+	tarval_undefined->value   = INT_TO_PTR(resid_tarval_undefined);
+
+	tarval_b_true->kind       = k_tarval;
+	tarval_b_true->mode       = mode_b;
+	tarval_b_true->value      = INT_TO_PTR(resid_tarval_b_true);
 
-	tarval_undefined->kind  = k_tarval;
-	tarval_undefined->mode  = mode_ANY;
-	tarval_undefined->value = INT_TO_PTR(resid_tarval_undefined);
+	tarval_b_false->kind      = k_tarval;
+	tarval_b_false->mode      = mode_b;
+	tarval_b_false->value     = INT_TO_PTR(resid_tarval_b_false);
 
-	tarval_b_true->kind     = k_tarval;
-	tarval_b_true->mode     = mode_b;
-	tarval_b_true->value    = INT_TO_PTR(resid_tarval_b_true);
+	tarval_unreachable->kind  = k_tarval;
+	tarval_unreachable->mode  = mode_X;
+	tarval_unreachable->value = INT_TO_PTR(resid_tarval_unreachable);
 
-	tarval_b_false->kind    = k_tarval;
-	tarval_b_false->mode    = mode_b;
-	tarval_b_false->value   = INT_TO_PTR(resid_tarval_b_false);
+	tarval_reachable->kind    = k_tarval;
+	tarval_reachable->mode    = mode_X;
+	tarval_reachable->value   = INT_TO_PTR(resid_tarval_reachable);
 
 	/*
 	 * assign output modes that are compatible with the
 	 * old implementation: Hex output
 	 */
-	set_tarval_mode_output_option(mode_U,  &hex_output);
-	set_tarval_mode_output_option(mode_C,  &hex_output);
 	set_tarval_mode_output_option(mode_Bs, &hex_output);
 	set_tarval_mode_output_option(mode_Bu, &hex_output);
 	set_tarval_mode_output_option(mode_Hs, &hex_output);
@@ -1608,16 +1766,20 @@ void init_tarval_2(void) {
 	set_tarval_mode_output_option(mode_Ls, &hex_output);
 	set_tarval_mode_output_option(mode_Lu, &hex_output);
 	set_tarval_mode_output_option(mode_P,  &hex_output);
-	}
+}
 
 /* free all memory occupied by tarval. */
 void finish_tarval(void) {
-	finish_strcalc ();
-	finish_fltcalc ();
+	finish_strcalc();
+	finish_fltcalc();
 	del_set(tarvals); tarvals = NULL;
 	del_set(values);  values = NULL;
 }
 
+int (is_tarval)(const void *thing) {
+	return _is_tarval(thing);
+}
+
 /****************************************************************************
  *   end of tv.c
  ****************************************************************************/