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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107546] [10/11/12/13 Regression] simd, redundant pcmpeqb
 and pxor
Date: Mon, 07 Nov 2022 07:16:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107546

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
typedef signed char v16qs __attribute__((vector_size(16)));
auto bar(v16qs x) { return x < 48; }

clang does expand it as 48 gt x. Gcc however does its usual change to x <=
=3D 47,
which it then tries to expand as ~(x > 47). I guess the expansion for x <=
=3D y
could be tweaked in the case where one argument is constant to undo what was
done earlier in the pipeline and expand as 48 > x.=