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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104582] [11/12 Regression] Unoptimal code for
 __negdi2 (and others) from libgcc2 due to unwanted vectorization
Date: Thu, 17 Feb 2022 16:40:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104582

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The costs look weird:
_1 1 times scalar_store costs 12 in body
_5 1 times scalar_store costs 12 in body
_1 1 times vector_store costs 12 in body
<unknown> 1 times vec_construct costs 8 in prologue
vec_construct is certainly more expensive than a store (especially in this =
case
when it is a store into a TImode variable which isn't addressable and will =
not
be in memory at all).=