+Wed Jul 10 16:06:00 2002 J"orn Rennecke <joern.rennecke@superh.com>
+
+ * cse.c (cse_insn): Supply proper SUBREG_BYTE to simplify_gen_subreg.
+ Get mode from dest.
+ If simplify_gen_subreg fails, try next equivalent.
+
2002-07-09 Gabriel Dos Reis <gdr@codesourcery.com>
* diagnostic.h: #include location.h
rtx new_src = 0;
unsigned src_hash;
struct table_elt *src_elt;
+ int byte = 0;
/* Ignore invalid entries. */
if (GET_CODE (elt->exp) != REG
&& ! exp_equiv_p (elt->exp, elt->exp, 1, 0))
continue;
- new_src
- = simplify_gen_subreg (new_mode, elt->exp, elt->mode, 0);
+ /* Calculate big endian correction for the SUBREG_BYTE
+ (or equivalent). We have already checked that M1
+ ( GET_MODE (dest) ) is not narrower than M2 (new_mode). */
+ if (BYTES_BIG_ENDIAN)
+ byte = (GET_MODE_SIZE (GET_MODE (dest))
+ - GET_MODE_SIZE (new_mode));
+ new_src = simplify_gen_subreg (new_mode, elt->exp,
+ GET_MODE (dest), byte);
+ /* The call to simplify_gen_subreg fails if the value
+ is VOIDmode, yet we can't do any simplification, e.g.
+ for EXPR_LISTs denoting function call results.
+ It is invalid to construct a SUBREG with a VOIDmode
+ SUBREG_REG, hence a zero new_src means we can't do
+ this substitution. */
+ if (! new_src)
+ continue;
src_hash = HASH (new_src, new_mode);
src_elt = lookup (new_src, src_hash, new_mode);