https://llvm.org/bugs/show_bug.cgi?id=30563
Bug ID: 30563
Summary: [AVX512F] Suboptimal code generated for a
_mm_mask_store_sd expansion
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: zvi.racko...@intel.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
We currently do not support the AVX512F _mm_mask_store_sd
[https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_mask_store_sd]
intrinics, but a reasonable expansion of this intrinsics to LLVM IR may be:
define void @_mm_mask_store_sd(double* nocapture %__W, i8 zeroext %__U, <2 x
double> %__A) local_unnamed_addr {
entry:
%tobool.i = trunc i8 %__U to i1
%mask = insertelement <2 x i1> <i1 undef, i1 false>, i1 %tobool.i, i32 0
%V = bitcast double * %__W to <2 x double>*
call void @llvm.masked.store.v2f64.p0v2f64(<2 x double> %__A, <2 x double>*
%V, i32 16, <2 x i1> %mask)
ret void
}
declare void @llvm.masked.store.v2f64.p0v2f64(<2 x double>, <2 x double>*,
i32, <2 x i1>)
which should be lowered to:
==========================================
kmovw %esi, %k1
vmovsd %xmm0, (%rdi){%k1}
==========================================
'llc -mcpu=knl' generates:
==========================================
vmovq %rsi, %xmm1
vpsllq $63, %xmm1, %xmm1
vpsrad $31, %xmm1, %xmm1
vpshufd $245, %xmm1, %xmm1 # xmm1 = xmm1[1,1,3,3]
vmaskmovpd %xmm0, %xmm1, (%rdi)
retq
==========================================
'llc -mcpu=skylake-avx512' generates:
==========================================
andl $1, %esi
kmovw %esi, %k0
kxorw %k0, %k0, %k1
kshiftrw $1, %k1, %k1
kshiftlw $1, %k1, %k1
korw %k0, %k1, %k1
vmovapd %xmm0, (%rdi) {%k1}
retq
==========================================
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