llvm/test/Transforms/InstSimplify/shufflevector.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s

define <4 x i32> @const_folding(<4 x i32> %x) {
; CHECK-LABEL: @const_folding(
; CHECK-NEXT:    ret <4 x i32> zeroinitializer
;
  %shuf = shufflevector <4 x i32> %x, <4 x i32> zeroinitializer, <4 x i32> <i32 5, i32 4, i32 5, i32 4>
  ret <4 x i32> %shuf
}

define <4 x i32> @const_folding1(<4 x i32> %x) {
; CHECK-LABEL: @const_folding1(
; CHECK-NEXT:    ret <4 x i32> <i32 5, i32 5, i32 5, i32 5>
;
  %shuf = shufflevector <4 x i32> <i32 5, i32 4, i32 5, i32 4>, <4 x i32> %x, <4 x i32> zeroinitializer
  ret <4 x i32> %shuf
}

define <4 x i32> @const_folding_negative(<3 x i32> %x) {
; CHECK-LABEL: @const_folding_negative(
; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <3 x i32> [[X:%.*]], <3 x i32> zeroinitializer, <4 x i32> <i32 2, i32 4, i32 5, i32 4>
; CHECK-NEXT:    ret <4 x i32> [[SHUF]]
;
  %shuf = shufflevector <3 x i32> %x, <3 x i32> zeroinitializer, <4 x i32> <i32 2, i32 4, i32 5, i32 4>
  ret <4 x i32> %shuf
}

define <4 x i32> @splat_operand(<4 x i32> %x) {
; CHECK-LABEL: @splat_operand(
; CHECK-NEXT:    [[SPLAT:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <4 x i32> [[SPLAT]], <4 x i32> undef, <4 x i32> <i32 0, i32 3, i32 2, i32 1>
; CHECK-NEXT:    ret <4 x i32> [[SHUF]]
;
  %splat = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> zeroinitializer
  %shuf = shufflevector <4 x i32> %splat, <4 x i32> undef, <4 x i32> <i32 0, i32 3, i32 2, i32 1>
  ret <4 x i32> %shuf
}

define <4 x i32> @undef_mask(<4 x i32> %x) {
; CHECK-LABEL: @undef_mask(
; CHECK-NEXT:    ret <4 x i32> undef
;
  %shuf = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> undef
  ret <4 x i32> %shuf
}

define <4 x i32> @identity_mask_0(<4 x i32> %x) {
; CHECK-LABEL: @identity_mask_0(
; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT:    ret <4 x i32> [[SHUF]]
;
  %shuf = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
  ret <4 x i32> %shuf
}

define <4 x i32> @identity_mask_1(<4 x i32> %x) {
; CHECK-LABEL: @identity_mask_1(
; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <4 x i32> undef, <4 x i32> [[X:%.*]], <4 x i32> <i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT:    ret <4 x i32> [[SHUF]]
;
  %shuf = shufflevector <4 x i32> undef, <4 x i32> %x, <4 x i32> <i32 4, i32 5, i32 6, i32 7>
  ret <4 x i32> %shuf
}

define <4 x i32> @pseudo_identity_mask(<4 x i32> %x) {
; CHECK-LABEL: @pseudo_identity_mask(
; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> [[X]], <4 x i32> <i32 0, i32 1, i32 2, i32 7>
; CHECK-NEXT:    ret <4 x i32> [[SHUF]]
;
  %shuf = shufflevector <4 x i32> %x, <4 x i32> %x, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
  ret <4 x i32> %shuf
}

define <4 x i32> @const_operand(<4 x i32> %x) {
; CHECK-LABEL: @const_operand(
; CHECK-NEXT:    ret <4 x i32> <i32 42, i32 45, i32 44, i32 43>
;
  %shuf = shufflevector <4 x i32> <i32 42, i32 43, i32 44, i32 45>, <4 x i32> %x, <4 x i32> <i32 0, i32 3, i32 2, i32 1>
  ret <4 x i32> %shuf
}

define <4 x i32> @merge(<4 x i32> %x) {
; CHECK-LABEL: @merge(
; CHECK-NEXT:    [[LOWER:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <2 x i32> <i32 1, i32 0>
; CHECK-NEXT:    [[UPPER:%.*]] = shufflevector <4 x i32> [[X]], <4 x i32> undef, <2 x i32> <i32 2, i32 3>
; CHECK-NEXT:    [[MERGED:%.*]] = shufflevector <2 x i32> [[UPPER]], <2 x i32> [[LOWER]], <4 x i32> <i32 3, i32 2, i32 0, i32 1>
; CHECK-NEXT:    ret <4 x i32> [[MERGED]]
;
  %lower = shufflevector <4 x i32> %x, <4 x i32> undef, <2 x i32> <i32 1, i32 0>
  %upper = shufflevector <4 x i32> %x, <4 x i32> undef, <2 x i32> <i32 2, i32 3>
  %merged = shufflevector <2 x i32> %upper, <2 x i32> %lower, <4 x i32> <i32 3, i32 2, i32 0, i32 1>
  ret <4 x i32> %merged
}