X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firmode.c;h=75b02bcb73f097abb44caae59bf6edd74e67a447;hb=bb5c6d5ce2e35c4074900017f8c8e1a4935054d0;hp=0a41285e50e34e61949c90f04e35349778992551;hpb=077eace885a7e700b3189f8d65acd04e689d4292;p=libfirm

diff --git a/ir/ir/irmode.c b/ir/ir/irmode.c
index 0a41285e5..75b02bcb7 100644
--- a/ir/ir/irmode.c
+++ b/ir/ir/irmode.c
@@ -536,11 +536,11 @@ int smaller_mode(const ir_mode *sm, const ir_mode *lm) {
 	case irms_int_number:
 		switch (get_mode_sort(lm)) {
 		case irms_int_number:
-			if(get_mode_arithmetic(sm) != get_mode_arithmetic(lm))
+			if (get_mode_arithmetic(sm) != get_mode_arithmetic(lm))
 				return 0;
 
 			/* only two complement implemented */
-			assert(get_mode_arithmetic(sm)==irma_twos_complement);
+			assert(get_mode_arithmetic(sm) == irma_twos_complement);
 
 			/* integers are convertable if
 			 *   - both have the same sign and lm is the larger one
@@ -548,12 +548,12 @@ int smaller_mode(const ir_mode *sm, const ir_mode *lm) {
 			 *     (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))
+			if (mode_is_signed(sm)) {
+				if (!mode_is_signed(lm))
 					return 0;
 				return sm_bits <= lm_bits;
 			} else {
-				if(mode_is_signed(lm)) {
+				if (mode_is_signed(lm)) {
 					return sm_bits < lm_bits;
 				}
 				return sm_bits <= lm_bits;
@@ -592,6 +592,37 @@ 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));
@@ -843,7 +874,11 @@ void init_mode(void) {
 ir_mode *find_unsigned_mode(const ir_mode *mode) {
 	ir_mode n = *mode;
 
-	assert(mode->sort == irms_int_number);
+	/* allowed for reference mode */
+	if (mode->sort == irms_reference)
+		n.sort = irms_int_number;
+
+	assert(n.sort == irms_int_number);
 	n.sign = 0;
 	return find_mode(&n);
 }
@@ -903,6 +938,25 @@ 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);