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511d5dc0be
We currently default to using either generic shuffles or MASK+PACKUS/PACKSS to truncate all integer vectors. For vector comparisons, we know that the result will be either all or zero bits in every element, which can be efficiently truncated by directly using PACKSS to repeatedly halve the size of each element. Due to the limited input values (-1 or 0) we don't need to account for vector element size, so for simplicity we just use the PACKSS(vXi16,vXi16) implementation in all cases. Additionally for AVX2 PACKSS of 256bit data we must perform a PERMQ shuffle to reorder the data into the correct order. I did investigate performing a single shuffle after all the PACKSS calls but the need to cross 128bit lanes makes this difficult to achieve efficiently. We avoid performing this on AVX512 as it should have better alternative truncation instructions. Differential Revision: https://reviews.llvm.org/D22814 llvm-svn: 277132
73 lines
2.9 KiB
LLVM
73 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=x86_64-unknown-unknown -mattr=+avx < %s | FileCheck %s --check-prefix=AVX
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; RUN: llc -mtriple=i386-unknown-linux-gnu -mcpu=knl < %s | FileCheck %s --check-prefix=KNL-32
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; Verify that we don't crash during codegen due to a wrong lowering
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; of a setcc node with illegal operand types and return type.
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define <8 x i16> @pr25080(<8 x i32> %a) {
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; AVX-LABEL: pr25080:
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; AVX: # BB#0: # %entry
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; AVX-NEXT: vandps {{.*}}(%rip), %ymm0, %ymm0
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; AVX-NEXT: vextractf128 $1, %ymm0, %xmm1
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; AVX-NEXT: vpxor %xmm2, %xmm2, %xmm2
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; AVX-NEXT: vpcmpeqd %xmm2, %xmm1, %xmm1
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; AVX-NEXT: vpcmpeqd %xmm2, %xmm0, %xmm0
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; AVX-NEXT: vpacksswb %xmm1, %xmm0, %xmm0
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; AVX-NEXT: vpor {{.*}}(%rip), %xmm0, %xmm0
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; AVX-NEXT: vpsllw $15, %xmm0, %xmm0
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; AVX-NEXT: vpsraw $15, %xmm0, %xmm0
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; AVX-NEXT: vzeroupper
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; AVX-NEXT: retq
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entry:
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%0 = trunc <8 x i32> %a to <8 x i23>
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%1 = icmp eq <8 x i23> %0, zeroinitializer
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%2 = or <8 x i1> %1, <i1 true, i1 true, i1 true, i1 true, i1 false, i1 false, i1 false, i1 false>
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%3 = sext <8 x i1> %2 to <8 x i16>
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ret <8 x i16> %3
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}
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define void @pr26232(i64 %a) {
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; KNL-32-LABEL: pr26232:
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; KNL-32: # BB#0: # %for_loop599.preheader
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; KNL-32-NEXT: pushl %esi
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; KNL-32-NEXT: .Ltmp0:
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; KNL-32-NEXT: .cfi_def_cfa_offset 8
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; KNL-32-NEXT: .Ltmp1:
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; KNL-32-NEXT: .cfi_offset %esi, -8
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; KNL-32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; KNL-32-NEXT: movl {{[0-9]+}}(%esp), %ecx
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; KNL-32-NEXT: movw $-1, %dx
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; KNL-32-NEXT: .p2align 4, 0x90
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; KNL-32-NEXT: .LBB1_1: # %for_loop599
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; KNL-32-NEXT: # =>This Inner Loop Header: Depth=1
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; KNL-32-NEXT: cmpl $65536, %ecx # imm = 0x10000
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; KNL-32-NEXT: movl %eax, %esi
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; KNL-32-NEXT: sbbl $0, %esi
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; KNL-32-NEXT: movl $0, %esi
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; KNL-32-NEXT: cmovlw %dx, %si
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; KNL-32-NEXT: testw %si, %si
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; KNL-32-NEXT: jne .LBB1_1
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; KNL-32-NEXT: # BB#2: # %for_exit600
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; KNL-32-NEXT: popl %esi
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; KNL-32-NEXT: retl
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allocas:
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br label %for_test11.preheader
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for_test11.preheader: ; preds = %for_test11.preheader, %allocas
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br i1 undef, label %for_loop599, label %for_test11.preheader
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for_loop599: ; preds = %for_loop599, %for_test11.preheader
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%less_i_load605_ = icmp slt i64 %a, 65536
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%less_i_load605__broadcast_init = insertelement <16 x i1> undef, i1 %less_i_load605_, i32 0
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%less_i_load605__broadcast = shufflevector <16 x i1> %less_i_load605__broadcast_init, <16 x i1> undef, <16 x i32> zeroinitializer
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%"oldMask&test607" = and <16 x i1> %less_i_load605__broadcast, undef
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%intmask.i894 = bitcast <16 x i1> %"oldMask&test607" to i16
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%res.i895 = icmp eq i16 %intmask.i894, 0
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br i1 %res.i895, label %for_exit600, label %for_loop599
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for_exit600: ; preds = %for_loop599
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ret void
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}
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