OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

regmove.c (fixup_match_1): Don't move INSN in front of P if it would end up in the shadow of a live flags... 

* regmove.c (fixup_match_1): Don't move INSN in front of P if
        it would end up in the shadow of a live flags regsiter.

From-SVN: r29034
This commit is contained in:
J"orn Rennecke 1999-09-01 14:22:05 -07:00 committed by Richard Henderson
parent 6c2a11802a
commit 2219e9215e
2 changed files with 19 additions and 1447 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1452
gcc/ChangeLog
View File

File diff suppressed because one or more lines are too long

14
gcc/regmove.c
View File

@ -1737,6 +1737,13 @@ fixup_match_1 (insn, set, src, src_subreg, dst, backward, operand_number,
if ((dst_note = find_regno_note (p, REG_DEAD, REGNO (dst)))
&& (GET_MODE (XEXP (dst_note, 0)) == GET_MODE (dst)))
{
/* If we would be moving INSN, check that we won't move it
into the shadow of a live a live flags register. */
/* ??? We only try to move it in front of P, although
we could move it anywhere between OVERLAP and P. */
if (overlap && GET_MODE (PREV_INSN (p)) != VOIDmode)
break;
if (! src_note)
{
rtx q;
@ -1844,8 +1851,11 @@ fixup_match_1 (insn, set, src, src_subreg, dst, backward, operand_number,
break;
if (! src_note && reg_overlap_mentioned_p (src, PATTERN (p)))
{
/* INSN was already checked to be movable when
we found no REG_DEAD note for src on it. */
/* INSN was already checked to be movable wrt. the registers that it
sets / uses when we found no REG_DEAD note for src on it, but it
still might clobber the flags register. We'll have to check that
we won't insert it into the shadow of a live flags register when
we finally know where we are to move it. */
overlap = p;
src_note = find_reg_note (p, REG_DEAD, src);
}