https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68627
Bug ID: 68627
Summary: [i386, AVX-512] Illegal insn generated while compiling
spec2k6/437.leslie3d for KNL
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: kyukhin at gcc dot gnu.org
Target Milestone: ---
Created attachment 36876
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36876&action=edit
Reproducer
Attached reduced testcase.
When -march=knl switch is passed, AVX-512 insn illegally generated.
$ gfortran -Ofast -mavx512f test.f -S
$ grep vbroadcastsd test.s | grep ymm
vbroadcastsd %xmm11, %ymm7
We need to force %zmm source for this broadcast and limit alternative to
at least AVX-512F
