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combine.c (combine_instructions): Don't use reg_equal/equiv results if the mode doesn't match.

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* combine.c (combine_instructions): Don't use reg_equal/equiv
        results if the mode doesn't match.

From-SVN: r102679
This commit is contained in:
Richard Henderson 2005-08-02 21:32:00 -07:00 committed by Richard Henderson
parent 776928b46c
commit 65030b761e
2 changed files with 11 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-08-02 Richard Henderson <rth@redhat.com>
* combine.c (combine_instructions): Don't use reg_equal/equiv
results if the mode doesn't match.
2005-08-02 Mark Mitchell <mark@codesourcery.com>
* config/i386/t-mingw32 (NATIVE_SYSTEM_HEADER_DIR): Set it.

9
gcc/combine.c
View File

@ -860,16 +860,19 @@ combine_instructions (rtx f, unsigned int nregs)
rtx temp = XEXP (links, 0);
if ((set = single_set (temp)) != 0
&& (note = find_reg_equal_equiv_note (temp)) != 0
&& GET_CODE (XEXP (note, 0)) != EXPR_LIST
&& (note = XEXP (note, 0), GET_CODE (note)) != EXPR_LIST
/* Avoid using a register that may already been marked
dead by an earlier instruction. */
&& ! unmentioned_reg_p (XEXP (note, 0), SET_SRC (set)))
&& ! unmentioned_reg_p (note, SET_SRC (set))
&& (GET_MODE (note) == VOIDmode
? SCALAR_INT_MODE_P (GET_MODE (SET_DEST (set)))
: GET_MODE (SET_DEST (set)) == GET_MODE (note)))
{
/* Temporarily replace the set's source with the
contents of the REG_EQUAL note. The insn will
be deleted or recognized by try_combine. */
rtx orig = SET_SRC (set);
SET_SRC (set) = XEXP (note, 0);
SET_SRC (set) = note;
next = try_combine (insn, temp, NULL_RTX,
&new_direct_jump_p);
if (next)