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From: "krebbel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105175] [12 Regression] Pointless warning
 about missed vector optimization
Date: Wed, 06 Apr 2022 08:30:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105175

--- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
I would expect the vectorizer to only generate vector modes which would fit
into word mode if no hardware vector support is available. E.g. for:

struct {
  unsigned a, b, c, d;
} s;
foo() {
  s.a &=3D 42;
  s.b &=3D 42;
  s.c &=3D 42;
  s.d &=3D 42;
}

I see two "vector 2 unsigned" operations being generated when compiling with
-mno-sse but with sse I get a 4 element vector as expected.=