Do not mark the transformed as visited. It makes no sense at all.

[libfirm] / ir / ir / irmode.c

diff --git a/ir/ir/irmode.c b/ir/ir/irmode.c
index 8b57031..75b02bc 100644 (file)
--- a/ir/ir/irmode.c
+++ b/ir/ir/irmode.c
@@ -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);