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compare-elim.c (find_comparisons_in_bb): Eliminate only compares having mode compatible with the mode of previous compare. 

* compare-elim.c (find_comparisons_in_bb): Eliminate only compares
	having mode compatible with the mode of previous compare.  Substitute
	compare mode of previous compare with the mode, compatible
	with eliminated and previous compare.

From-SVN: r184816
This commit is contained in:
Uros Bizjak 2012-03-02 19:54:27 +01:00 committed by Uros Bizjak
parent 6f975f93d4
commit 34c5f21a38
2 changed files with 31 additions and 2 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2012-03-02 Uros Bizjak <ubizjak@gmail.com>
* compare-elim.c (find_comparisons_in_bb): Eliminate only compares
having mode compatible with the mode of previous compare. Substitute
compare mode of previous compare with the mode, compatible
with eliminated and previous compare.
2012-03-02 Peter Bergner <bergner@vnet.ibm.com>
* config/rs6000/dfp.md (floatdidd2): New define_insn.

26
gcc/compare-elim.c
View File

@ -301,15 +301,37 @@ find_comparisons_in_bb (struct dom_walk_data *data ATTRIBUTE_UNUSED,
/* Eliminate a compare that's redundant with the previous. */
if (last_cmp_valid
&& src_mode == last_cmp->orig_mode
&& rtx_equal_p (last_cmp->in_a, XEXP (src, 0))
&& rtx_equal_p (last_cmp->in_b, XEXP (src, 1)))
{
rtx flags, x;
enum machine_mode new_mode
= targetm.cc_modes_compatible (last_cmp->orig_mode, src_mode);
/* New mode is incompatible with the previous compare mode. */
if (new_mode == VOIDmode)
continue;
if (new_mode != last_cmp->orig_mode)
{
flags = gen_rtx_REG (src_mode, targetm.flags_regnum);
/* Generate new comparison for substitution. */
x = gen_rtx_COMPARE (new_mode, XEXP (src, 0), XEXP (src, 1));
x = gen_rtx_SET (VOIDmode, flags, x);
if (!validate_change (last_cmp->insn,
&PATTERN (last_cmp->insn), x, false))
continue;
last_cmp->orig_mode = new_mode;
}
delete_insn (insn);
continue;
}
last_cmp = XCNEW (struct comparison);
last_cmp = XCNEW (struct comparison);
last_cmp->insn = insn;
last_cmp->prev_clobber = last_clobber;
last_cmp->in_a = XEXP (src, 0);