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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96654] Failure to optimize vectorized
 conversion to `int` with AVX
Date: Sat, 22 Aug 2020 16:32:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96654

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
gcc doesn't seem very fond of using 2 different vector bitsizes at the same
time, so VEC_PACK_FIX_TRUNC_EXPR takes 2 vectors of 2 double and gives one
vector of 4 int. At the RTL level, we have a vec_concat:V4DF of 2 V2DF adja=
cent
in memory, but nothing knows to turn that into a single load. (the conversi=
on
itself of 4 double to int is fine)=