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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102519] [12 Regression] VRP Jump threader memory
 explosion
Date: Wed, 29 Sep 2021 15:04:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102519

--- Comment #8 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to David Edelsohn from comment #7)
> Have you tried a native PPC64LE Linux build?
>=20
> AIX defaults to 32 bit, and it's big endian. I wouldn't expect that to
> affect the memory usage, but I'm mentioning it.
>=20
> Did you try to compiler gcc/testsuite/gcc.target/powerpc/rlwimi-1.c ?

Yes.  That was the first thing I did.

I've also tried ppc32 with setarch ppc32 on gcc135.

ppc64le:
 TOTAL                              :  34.50         11.83         46.33=20=
=20=20=20=20=20=20
  540M (OLD)
 TOTAL                              :  31.62         11.72         43.34=20=
=20=20=20=20=20=20
  555M (NEW)

-ftime-report -O2 -m32 -mlittle-endian
 TOTAL                              :  32.17         11.35         43.53=20=
=20=20=20=20=20=20
  518M (OLD)
 TOTAL                              :  31.89         11.89         43.79=20=
=20=20=20=20=20=20
  533M (NEW)

-ftime-report -O2 -m32 -mbig-endian
 TOTAL                              :  29.07         11.24         40.31=20=
=20=20=20=20=20=20
  518M (OLD)
 TOTAL                              :  33.68         12.66         46.34=20=
=20=20=20=20=20=20
  533M (NEW)

These are all on a stage1 compiler=