147 lines
7.2 KiB
LLVM
147 lines
7.2 KiB
LLVM
; RUN: opt -S -instcombine < %s | FileCheck %s
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declare void @v4float_user(<4 x float>) #0
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define float @extract_one_select(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
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; CHECK-LABEL: @extract_one_select(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %c, 0
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SEL]], i32 2
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; CHECK-NEXT: ret float [[EXTRACT]]
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;
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%cmp = icmp ne i32 %c, 0
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%sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
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%extract = extractelement <4 x float> %sel, i32 2
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ret float %extract
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}
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; Multiple extractelements
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define <2 x float> @extract_two_select(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
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; CHECK-LABEL: @extract_two_select(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %c, 0
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[BUILD2:%.*]] = shufflevector <4 x float> [[SEL]], <4 x float> undef, <2 x i32> <i32 1, i32 2>
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; CHECK-NEXT: ret <2 x float> [[BUILD2]]
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;
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%cmp = icmp ne i32 %c, 0
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%sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
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%extract1 = extractelement <4 x float> %sel, i32 1
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%extract2 = extractelement <4 x float> %sel, i32 2
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%build1 = insertelement <2 x float> undef, float %extract1, i32 0
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%build2 = insertelement <2 x float> %build1, float %extract2, i32 1
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ret <2 x float> %build2
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}
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; Select has an extra non-extractelement user, don't change it
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define float @extract_one_select_user(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
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; CHECK-LABEL: @extract_one_select_user(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %c, 0
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SEL]], i32 2
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; CHECK-NEXT: call void @v4float_user(<4 x float> [[SEL]])
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; CHECK-NEXT: ret float [[EXTRACT]]
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;
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%cmp = icmp ne i32 %c, 0
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%sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
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%extract = extractelement <4 x float> %sel, i32 2
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call void @v4float_user(<4 x float> %sel)
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ret float %extract
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}
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define float @extract_one_vselect_user(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
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; CHECK-LABEL: @extract_one_vselect_user(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq <4 x i32> %c, zeroinitializer
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; CHECK-NEXT: [[SEL:%.*]] = select <4 x i1> [[CMP]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SEL]], i32 2
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; CHECK-NEXT: call void @v4float_user(<4 x float> [[SEL]])
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; CHECK-NEXT: ret float [[EXTRACT]]
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;
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%cmp = icmp ne <4 x i32> %c, zeroinitializer
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%sel = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
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%extract = extractelement <4 x float> %sel, i32 2
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call void @v4float_user(<4 x float> %sel)
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ret float %extract
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}
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; Do not convert the vector select into a scalar select. That would increase
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; the instruction count and potentially obfuscate a vector min/max idiom.
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define float @extract_one_vselect(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
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; CHECK-LABEL: @extract_one_vselect(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq <4 x i32> %c, zeroinitializer
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; CHECK-NEXT: [[SELECT:%.*]] = select <4 x i1> [[CMP]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SELECT]], i32 0
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; CHECK-NEXT: ret float [[EXTRACT]]
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;
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%cmp = icmp ne <4 x i32> %c, zeroinitializer
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%select = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
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%extract = extractelement <4 x float> %select, i32 0
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ret float %extract
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}
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; Multiple extractelements from a vector select
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define <2 x float> @extract_two_vselect(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
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; CHECK-LABEL: @extract_two_vselect(
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq <4 x i32> %c, zeroinitializer
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; CHECK-NEXT: [[SEL:%.*]] = select <4 x i1> [[CMP]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[BUILD2:%.*]] = shufflevector <4 x float> [[SEL]], <4 x float> undef, <2 x i32> <i32 1, i32 2>
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; CHECK-NEXT: ret <2 x float> [[BUILD2]]
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;
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%cmp = icmp ne <4 x i32> %c, zeroinitializer
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%sel = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
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%extract1 = extractelement <4 x float> %sel, i32 1
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%extract2 = extractelement <4 x float> %sel, i32 2
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%build1 = insertelement <2 x float> undef, float %extract1, i32 0
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%build2 = insertelement <2 x float> %build1, float %extract2, i32 1
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ret <2 x float> %build2
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}
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; The vector selects are not decomposed into scalar selects because that would increase
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; the instruction count. Extract+insert is converted to non-lane-crossing shuffles.
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; Test multiple extractelements
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define <4 x float> @simple_vector_select(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
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; CHECK-LABEL: @simple_vector_select(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = extractelement <4 x i32> %c, i32 0
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0
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; CHECK-NEXT: [[A_SINK:%.*]] = select i1 [[TOBOOL]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x i32> %c, i32 1
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; CHECK-NEXT: [[TOBOOL1:%.*]] = icmp eq i32 [[TMP1]], 0
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; CHECK-NEXT: [[A_SINK1:%.*]] = select i1 [[TOBOOL1]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x float> [[A_SINK]], <4 x float> [[A_SINK1]], <4 x i32> <i32 0, i32 5, i32 undef, i32 undef>
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; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i32> %c, i32 2
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; CHECK-NEXT: [[TOBOOL6:%.*]] = icmp eq i32 [[TMP3]], 0
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; CHECK-NEXT: [[A_SINK2:%.*]] = select i1 [[TOBOOL6]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[TMP4:%.*]] = shufflevector <4 x float> [[TMP2]], <4 x float> [[A_SINK2]], <4 x i32> <i32 0, i32 1, i32 6, i32 undef>
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; CHECK-NEXT: [[TMP5:%.*]] = extractelement <4 x i32> %c, i32 3
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; CHECK-NEXT: [[TOBOOL11:%.*]] = icmp eq i32 [[TMP5]], 0
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; CHECK-NEXT: [[A_SINK3:%.*]] = select i1 [[TOBOOL11]], <4 x float> %b, <4 x float> %a
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; CHECK-NEXT: [[TMP6:%.*]] = shufflevector <4 x float> [[TMP4]], <4 x float> [[A_SINK3]], <4 x i32> <i32 0, i32 1, i32 2, i32 7>
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; CHECK-NEXT: ret <4 x float> [[TMP6]]
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;
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entry:
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%0 = extractelement <4 x i32> %c, i32 0
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%tobool = icmp ne i32 %0, 0
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%a.sink = select i1 %tobool, <4 x float> %a, <4 x float> %b
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%1 = extractelement <4 x float> %a.sink, i32 0
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%2 = insertelement <4 x float> undef, float %1, i32 0
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%3 = extractelement <4 x i32> %c, i32 1
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%tobool1 = icmp ne i32 %3, 0
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%a.sink1 = select i1 %tobool1, <4 x float> %a, <4 x float> %b
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%4 = extractelement <4 x float> %a.sink1, i32 1
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%5 = insertelement <4 x float> %2, float %4, i32 1
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%6 = extractelement <4 x i32> %c, i32 2
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%tobool6 = icmp ne i32 %6, 0
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%a.sink2 = select i1 %tobool6, <4 x float> %a, <4 x float> %b
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%7 = extractelement <4 x float> %a.sink2, i32 2
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%8 = insertelement <4 x float> %5, float %7, i32 2
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%9 = extractelement <4 x i32> %c, i32 3
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%tobool11 = icmp ne i32 %9, 0
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%a.sink3 = select i1 %tobool11, <4 x float> %a, <4 x float> %b
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%10 = extractelement <4 x float> %a.sink3, i32 3
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%11 = insertelement <4 x float> %8, float %10, i32 3
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ret <4 x float> %11
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}
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attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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