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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/103641] [11/12 regression] Severe compile time
 regression in SLP vectorize step
Date: Mon, 07 Feb 2022 12:19:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103641

--- Comment #30 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
No problem during nightlies. No real changes in other workloads in compile =
time
nor runtime.

can confirm no perf change for xxhash and compile time decreased from 8 to 1
sec.

tree vectorization                 :   0.28 (  3%)   0.00 (  0%)   0.28 (  =
3%)=20
 135k (  0%)
tree slp vectorization             :   7.43 ( 89%)   0.00 (  0%)   7.41 ( 8=
7%)=20
3450k (  8%)

into

tree vectorization                 :   0.02 (  2%)   0.00 (  0%)   0.02 (  =
2%)=20
 135k (  0%)
tree slp vectorization             :   0.37 ( 35%)   0.00 (  0%)   0.39 ( 3=
1%)=20
3400k (  8%)=