X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firmode.c;h=f83214e1062db9b695ca15cfe8f2311ceb8a25da;hb=9baadfac02ee53ae9a7caa7593225a49ccd54753;hp=71da96f3be6022718b6e491192ba00b02d8ed8b1;hpb=c0022b659f113c74270944fe5e3c4c24cb719b1c;p=libfirm

diff --git a/ir/ir/irmode.c b/ir/ir/irmode.c
index 71da96f3b..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;
 }
 
@@ -523,6 +517,79 @@ int (mode_is_int_vector)(const ir_mode *mode) {
 /* Returns true if sm can be converted to lm without loss. */
 int smaller_mode(const ir_mode *sm, const ir_mode *lm) {
 	int sm_bits, lm_bits;
+
+	assert(sm);
+	assert(lm);
+
+	if (sm == lm) return 1;
+
+	sm_bits = get_mode_size_bits(sm);
+	lm_bits = get_mode_size_bits(lm);
+
+	switch (get_mode_sort(sm)) {
+	case irms_int_number:
+		switch (get_mode_sort(lm)) {
+		case irms_int_number:
+			if (get_mode_arithmetic(sm) != get_mode_arithmetic(lm))
+				return 0;
+
+			/* only two complement implemented */
+			assert(get_mode_arithmetic(sm) == irma_twos_complement);
+
+			/* integers are convertable if
+			 *   - both have the same sign and lm is the larger one
+			 *   - lm is the signed one and is at least two bits larger
+			 *     (one for the sign, one for the highest bit of sm)
+			 *   - sm & lm are two_complement and lm has greater or equal number of bits
+			 */
+			if (mode_is_signed(sm)) {
+				if (!mode_is_signed(lm))
+					return 0;
+				return sm_bits <= lm_bits;
+			} else {
+				if (mode_is_signed(lm)) {
+					return sm_bits < lm_bits;
+				}
+				return sm_bits <= lm_bits;
+			}
+			break;
+
+		case irms_float_number:
+			/* int to float works if the float is large enough */
+			return 0;
+
+		default:
+			break;
+		}
+		break;
+
+	case irms_float_number:
+		if (get_mode_arithmetic(sm) == get_mode_arithmetic(lm)) {
+			if ( (get_mode_sort(lm) == irms_float_number)
+				&& (get_mode_size_bits(lm) >= get_mode_size_bits(sm)) )
+				return 1;
+		}
+		break;
+
+	case irms_reference:
+		/* do exist machines out there with different pointer lenghts ?*/
+		return 0;
+
+	case irms_internal_boolean:
+		return mode_is_int(lm);
+
+	default:
+		break;
+	}
+
+	/* else */
+	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);
@@ -678,7 +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);