DirectXShaderCompiler/test/Transforms/InstCombine/select-extractelement.ll

; RUN: opt -S -instcombine < %s | FileCheck %s

declare void @v4float_user(<4 x float>) #0



define float @extract_one_select(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
; CHECK-LABEL: @extract_one_select(
; CHECK-NOT: select i1 {{.*}}, <4 x float>
  %cmp = icmp ne i32 %c, 0
  %sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
  %extract = extractelement <4 x float> %sel, i32 2
  ret float %extract
}

; Multiple extractelements
define <2 x float> @extract_two_select(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
; CHECK-LABEL: @extract_two_select(
; CHECK: select i1 {{.*}}, <4 x float>
  %cmp = icmp ne i32 %c, 0
  %sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
  %extract1 = extractelement <4 x float> %sel, i32 1
  %extract2 = extractelement <4 x float> %sel, i32 2
  %build1 = insertelement <2 x float> undef, float %extract1, i32 0
  %build2 = insertelement <2 x float> %build1, float %extract2, i32 1
  ret <2 x float> %build2
}

; Select has an extra non-extractelement user, don't change it
define float @extract_one_select_user(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
; CHECK-LABEL: @extract_one_select_user(
; CHECK: select i1 {{.*}}, <4 x float>
  %cmp = icmp ne i32 %c, 0
  %sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
  %extract = extractelement <4 x float> %sel, i32 2
  call void @v4float_user(<4 x float> %sel)
  ret float %extract
}

define float @extract_one_vselect_user(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
; CHECK-LABEL: @extract_one_vselect_user(
; CHECK: select <4 x i1> {{.*}}, <4 x float>
  %cmp = icmp ne <4 x i32> %c, zeroinitializer
  %sel = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
  %extract = extractelement <4 x float> %sel, i32 2
  call void @v4float_user(<4 x float> %sel)
  ret float %extract
}

; Extract from a vector select
define float @extract_one_vselect(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
; CHECK-LABEL: @extract_one_vselect(
; CHECK-NOT: select <4 x i1>
  %cmp = icmp ne <4 x i32> %c, zeroinitializer
  %select = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
  %extract = extractelement <4 x float> %select, i32 0
  ret float %extract
}

; Multiple extractelements from a vector select
define <2 x float> @extract_two_vselect(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
; CHECK-LABEL: @extract_two_vselect(
; CHECK-NOT: select i1 {{.*}}, <4 x float>
  %cmp = icmp ne <4 x i32> %c, zeroinitializer
  %sel = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
  %extract1 = extractelement <4 x float> %sel, i32 1
  %extract2 = extractelement <4 x float> %sel, i32 2
  %build1 = insertelement <2 x float> undef, float %extract1, i32 0
  %build2 = insertelement <2 x float> %build1, float %extract2, i32 1
  ret <2 x float> %build2
}

; All the vector selects should be decomposed into scalar selects
; Test multiple extractelements
define <4 x float> @simple_vector_select(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
; CHECK-LABEL: @simple_vector_select(
; CHECK-NOT: select i1 {{.*}}, <4 x float>
entry:
  %0 = extractelement <4 x i32> %c, i32 0
  %tobool = icmp ne i32 %0, 0
  %a.sink = select i1 %tobool, <4 x float> %a, <4 x float> %b
  %1 = extractelement <4 x float> %a.sink, i32 0
  %2 = insertelement <4 x float> undef, float %1, i32 0
  %3 = extractelement <4 x i32> %c, i32 1
  %tobool1 = icmp ne i32 %3, 0
  %a.sink1 = select i1 %tobool1, <4 x float> %a, <4 x float> %b
  %4 = extractelement <4 x float> %a.sink1, i32 1
  %5 = insertelement <4 x float> %2, float %4, i32 1
  %6 = extractelement <4 x i32> %c, i32 2
  %tobool6 = icmp ne i32 %6, 0
  %a.sink2 = select i1 %tobool6, <4 x float> %a, <4 x float> %b
  %7 = extractelement <4 x float> %a.sink2, i32 2
  %8 = insertelement <4 x float> %5, float %7, i32 2
  %9 = extractelement <4 x i32> %c, i32 3
  %tobool11 = icmp ne i32 %9, 0
  %a.sink3 = select i1 %tobool11, <4 x float> %a, <4 x float> %b
  %10 = extractelement <4 x float> %a.sink3, i32 3
  %11 = insertelement <4 x float> %8, float %10, i32 3
  ret <4 x float> %11
}

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" }