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From: "avieira at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug regression/103997] [12 Regression] gcc.target/i386/pr88531-??.c
 scan-assembler-times FAILs
Date: Mon, 24 Jan 2022 14:01:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103997

--- Comment #10 from avieira at gcc dot gnu.org ---
Hi Levy,

I did a quick experiment, compiled exchange2_r with trunk and with trunk + =
all
my epilogue and unroll vector patches reverted, with '-march=3Dalderlake -O=
fast
-flto -funroll_loops' and the codegen is pretty much the same.

Could it be that picking a different mode than we did before all of my patc=
hes,
was a better choice? If this is the case then this is something that should=
 be
fixed by an appropriate cost-model, picking the best mode for the specific
loop's epilogue.

The patches I reverted were:
f4ca0a53be18dfc7162fd5dcc1e73c4203805e14
7ca1582ca60dc84cc3fc46b9cda620e2a0bed1bb
016bd7523131b645bca5b5530c81ab5149922743
d3ff7420e941931d32ce2e332e7968fe67ba20af

What were you using as a baseline for that last regression?=