------- Additional Comments From joern dot rennecke at st dot com 2005-09-22
17:37 -------
Subject: RFA: fix PR 23837 (Re: [4.0/4.1 regression] Wrong code with
-fschedule-insns)
I have regtested the attached patch on i686-pc-linux-gnu in mainline
from 2005-09-19 18:00 UTC.
2005-09-22 J"orn Rennecke <[EMAIL PROTECTED]>
PR rtl-optimization/23837
* optabs.c (no_conflict_move_test): Don't set must_stay for a
clobber / clobber match between dest and p->first.
Index: optabs.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/optabs.c,v
retrieving revision 1.291
diff -p -r1.291 optabs.c
*** optabs.c 15 Sep 2005 21:51:13 -0000 1.291
--- optabs.c 22 Sep 2005 17:31:13 -0000
*************** no_conflict_move_test (rtx dest, rtx set
*** 3021,3027 ****
return;
/* If this insn sets / clobbers a register that feeds one of the insns
already in the list, this insn has to stay too. */
! else if (reg_mentioned_p (dest, PATTERN (p->first))
|| reg_used_between_p (dest, p->first, p->insn)
/* Likewise if this insn depends on a register set by a previous
insn in the list. */
--- 3021,3028 ----
return;
/* If this insn sets / clobbers a register that feeds one of the insns
already in the list, this insn has to stay too. */
! else if (reg_overlap_mentioned_p (dest, PATTERN (p->first))
! || (CALL_P (p->first) && (find_reg_fusage (p->first, USE, dest)))
|| reg_used_between_p (dest, p->first, p->insn)
/* Likewise if this insn depends on a register set by a previous
insn in the list. */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23837
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