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[Bug tree-optimization/70251] Wrong code with -O3 -march=skylake-avx512.
- From: "ienkovich at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 16 Mar 2016 13:25:34 +0000
- Subject: [Bug tree-optimization/70251] Wrong code with -O3 -march=skylake-avx512.
- Auto-submitted: auto-generated
- References: <bug-70251-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70251
Ilya Enkovich <ienkovich at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-03-16
Ever confirmed|0 |1
--- Comment #1 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
Confirm. The problem is that
vect_patt_50.39_93 = VEC_COND_EXPR <mask_patt_51.38_90, { 1, .. , 1 }, { 0, ..
, 0 }>;
vect__17.44_98 = vect_patt_50.39_93 + vect__16.43_97;
is replaced with:
_1 = VIEW_CONVERT_EXPR<vector(64) unsigned char>(mask_patt_51.38_90);
vect__17.44_98 = vect__16.43_97 - _1;
which works for vector masks but doesn't work for scalar masks.