X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firmode.c;h=f83214e1062db9b695ca15cfe8f2311ceb8a25da;hb=9baadfac02ee53ae9a7caa7593225a49ccd54753;hp=b59c13cd31829420978106a9d7c65d678c8b7fc9;hpb=946ac143432f37cbbadcd039b9c9892e21884ff5;p=libfirm

diff --git a/ir/ir/irmode.c b/ir/ir/irmode.c
index b59c13cd3..f83214e10 100644
--- a/ir/ir/irmode.c
+++ b/ir/ir/irmode.c
@@ -23,27 +23,22 @@
  * @author   Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Mathias Heil
  * @version  $Id$
  */
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "config.h"
 
-#ifdef HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
-#ifdef HAVE_STRING_H
-# include <string.h>
-#endif
+#include <stdlib.h>
+#include <string.h>
 
-# include <stddef.h>
+#include <stddef.h>
 
-# include "irprog_t.h"
-# include "irmode_t.h"
-# include "ident.h"
-# include "tv_t.h"
-# include "obst.h"
-# include "irhooks.h"
-# include "irtools.h"
-# include "array.h"
+#include "irprog_t.h"
+#include "irmode_t.h"
+#include "ident.h"
+#include "tv_t.h"
+#include "obst.h"
+#include "irhooks.h"
+#include "irtools.h"
+#include "array.h"
+#include "error.h"
 
 /** Obstack to hold all modes. */
 static struct obstack modes;
@@ -60,7 +55,7 @@ static ir_mode **mode_list;
  *
  * TODO: Add other fields
  **/
-static INLINE int modes_are_equal(const ir_mode *m, const ir_mode *n) {
+static inline int modes_are_equal(const ir_mode *m, const ir_mode *n) {
 	if (m == n) return 1;
 	if (m->sort         == n->sort &&
 		m->arithmetic   == n->arithmetic &&
@@ -292,14 +287,15 @@ ir_mode *new_ir_mode(const char *name, ir_mode_sort sort, int bit_size, int sign
 	case irms_control_flow:
 	case irms_memory:
 	case irms_internal_boolean:
-		assert(0 && "internal modes cannot be user defined");
-		break;
+		panic("internal modes cannot be user defined");
 
 	case irms_float_number:
 	case irms_int_number:
 	case irms_reference:
 		mode = register_mode(&mode_tmpl);
+		break;
 	}
+	assert(mode != NULL);
 	return mode;
 }
 
@@ -339,20 +335,18 @@ ir_mode *new_ir_vector_mode(const char *name, ir_mode_sort sort, int bit_size, u
 	case irms_control_flow:
 	case irms_memory:
 	case irms_internal_boolean:
-		assert(0 && "internal modes cannot be user defined");
-		break;
+		panic("internal modes cannot be user defined");
 
 	case irms_reference:
-		assert(0 && "only integer and floating point modes can be vectorized");
-		break;
+		panic("only integer and floating point modes can be vectorized");
 
 	case irms_float_number:
-		assert(0 && "not yet implemented");
-		break;
+		panic("not yet implemented");
 
 	case irms_int_number:
 		mode = register_mode(&mode_tmpl);
 	}
+	assert(mode != NULL);
 	return mode;
 }
 
@@ -592,6 +586,37 @@ int smaller_mode(const ir_mode *sm, const ir_mode *lm) {
 	return 0;
 }
 
+/* Returns true if a value of mode sm can be converted into mode lm
+   and backwards without loss. */
+int values_in_mode(const ir_mode *sm, const ir_mode *lm) {
+	int sm_bits, lm_bits;
+	ir_mode_arithmetic arith;
+
+	assert(sm);
+	assert(lm);
+
+	if (sm == lm) return 1;
+
+	if (sm == mode_b)
+		return mode_is_int(lm);
+
+	sm_bits = get_mode_size_bits(sm);
+	lm_bits = get_mode_size_bits(lm);
+
+	arith = get_mode_arithmetic(sm);
+	if (arith != get_mode_arithmetic(lm))
+		return 0;
+
+	switch (arith) {
+		case irma_twos_complement:
+		case irma_ieee754:
+			return get_mode_size_bits(sm) <= get_mode_size_bits(lm);
+
+		default:
+			return 0;
+	}
+}
+
 /* Return the signed integer equivalent mode for an reference mode. */
 ir_mode *get_reference_mode_signed_eq(ir_mode *mode) {
 	assert(mode_is_reference(mode));
@@ -720,7 +745,9 @@ void init_mode(void) {
 	newmode.name    = new_id_from_chars("E", 1);
 	newmode.code    = irm_E;
 	newmode.sign    = 1;
-	newmode.size    = 80;
+	/* note that the tarval module is calculating with 80 bits, but we use
+	 * 96 bits, as that is what will be stored to memory by most hardware */
+	newmode.size    = 96;
 
 	mode_E = register_mode(&newmode);
 
@@ -907,6 +934,25 @@ int mode_wrap_around(const ir_mode *mode) {
 	return mode_is_int(mode);
 }
 
+/*
+ * Returns non-zero if the cast from mode src to mode dst is a
+ * reinterpret cast (ie. only the bit pattern is reinterpreted,
+ * no conversion is done)
+ */
+int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst) {
+	ir_mode_arithmetic ma;
+
+	if (src == dst)
+		return 1;
+	if (get_mode_size_bits(src) != get_mode_size_bits(dst))
+		return 0;
+	ma = get_mode_arithmetic(src);
+	if (ma != get_mode_arithmetic(dst))
+		return 0;
+
+	return ma == irma_twos_complement || ma == irma_ones_complement;
+}
+
 void finish_mode(void) {
 	obstack_free(&modes, 0);
 	DEL_ARR_F(mode_list);