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 ========================================== -- You are receiving this mail because: You are on the CC list for the bug.
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