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[Bug middle-end/17503] [4.0 Regression] Huge performance regression in invalid_mode_change_p
- From: "drow at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 20 Sep 2004 19:23:27 -0000
- Subject: [Bug middle-end/17503] [4.0 Regression] Huge performance regression in invalid_mode_change_p
- References: <20040915165050.17503.drow@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From drow at gcc dot gnu dot org 2004-09-20 19:23 -------
Yes, Roger's patch is innocent.
Richard, I haven't narrowed it down to one patch yet, but it's down to the
six-hour window in which you committed the patch for PR 9997. That's my
suspect. There is no substantive difference in the RTL diffs except that
numbers for pseudoregisters get larger:
-(insn 9 8 10 1 (set (reg:SI 59 [ T.665 ])
+(insn 9 8 10 1 (set (reg:SI 11374 [ T.665 ])
(mem/s/j:SI (plus:SI (reg/f:SI 11377)
and stack offsets fluctuate a bit.
I'll verify that I've pegged the right patch. Do we need to do this at -O0?
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What |Removed |Added
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CC| |rth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17503