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shuffle-select-narrow-inseltpoison.ll
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shuffle-select-narrow-inseltpoison.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; Narrow the select operands to eliminate the existing shuffles and replace a wide select with a narrow select.
define <2 x i8> @narrow_shuffle_of_select(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select(
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> poison, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> [[TMP1]], <2 x i8> [[TMP2]]
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}
; The 1st shuffle is not extending with undefs, but demanded elements corrects that.
define <2 x i8> @narrow_shuffle_of_select_overspecified_extend(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_overspecified_extend(
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> poison, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x i8> [[Y:%.*]], <4 x i8> poison, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> [[TMP1]], <2 x i8> [[TMP2]]
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
%widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}
; Verify that undef elements are acceptable for identity shuffle mask. Also check FP types.
define <3 x float> @narrow_shuffle_of_select_undefs(<3 x i1> %cmp, <4 x float> %x, <4 x float> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_undefs(
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x float> [[X:%.*]], <4 x float> poison, <3 x i32> <i32 0, i32 1, i32 undef>
; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x float> [[Y:%.*]], <4 x float> poison, <3 x i32> <i32 0, i32 1, i32 undef>
; CHECK-NEXT: [[R:%.*]] = select <3 x i1> [[CMP:%.*]], <3 x float> [[TMP1]], <3 x float> [[TMP2]]
; CHECK-NEXT: ret <3 x float> [[R]]
;
%widecmp = shufflevector <3 x i1> %cmp, <3 x i1> poison, <4 x i32> <i32 undef, i32 1, i32 2, i32 undef>
%widesel = select <4 x i1> %widecmp, <4 x float> %x, <4 x float> %y
%r = shufflevector <4 x float> %widesel, <4 x float> poison, <3 x i32> <i32 0, i32 1, i32 undef>
ret <3 x float> %r
}
declare void @use(<4 x i8>)
declare void @use_cmp(<4 x i1>)
; Negative test - extra use would require more instructions than we started with.
define <2 x i8> @narrow_shuffle_of_select_use1(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_use1(
; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
; CHECK-NEXT: [[WIDESEL:%.*]] = select <4 x i1> [[WIDECMP]], <4 x i8> [[X:%.*]], <4 x i8> [[Y:%.*]]
; CHECK-NEXT: call void @use(<4 x i8> [[WIDESEL]])
; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i8> [[WIDESEL]], <4 x i8> poison, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y
call void @use(<4 x i8> %widesel)
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}
; Negative test - extra use would require more instructions than we started with.
define <2 x i8> @narrow_shuffle_of_select_use2(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_use2(
; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
; CHECK-NEXT: call void @use_cmp(<4 x i1> [[WIDECMP]])
; CHECK-NEXT: [[WIDESEL:%.*]] = select <4 x i1> [[WIDECMP]], <4 x i8> [[X:%.*]], <4 x i8> [[Y:%.*]]
; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i8> [[WIDESEL]], <4 x i8> poison, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
call void @use_cmp(<4 x i1> %widecmp)
%widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}
; Negative test - mismatched types would require extra shuffling.
define <3 x i8> @narrow_shuffle_of_select_mismatch_types1(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_mismatch_types1(
; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
; CHECK-NEXT: [[WIDESEL:%.*]] = select <4 x i1> [[WIDECMP]], <4 x i8> [[X:%.*]], <4 x i8> [[Y:%.*]]
; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i8> [[WIDESEL]], <4 x i8> poison, <3 x i32> <i32 0, i32 1, i32 2>
; CHECK-NEXT: ret <3 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <3 x i32> <i32 0, i32 1, i32 2>
ret <3 x i8> %r
}
; Negative test - mismatched types would require extra shuffling.
define <3 x i8> @narrow_shuffle_of_select_mismatch_types2(<4 x i1> %cmp, <6 x i8> %x, <6 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_mismatch_types2(
; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <4 x i1> [[CMP:%.*]], <4 x i1> poison, <6 x i32> <i32 0, i32 1, i32 2, i32 undef, i32 undef, i32 undef>
; CHECK-NEXT: [[WIDESEL:%.*]] = select <6 x i1> [[WIDECMP]], <6 x i8> [[X:%.*]], <6 x i8> [[Y:%.*]]
; CHECK-NEXT: [[R:%.*]] = shufflevector <6 x i8> [[WIDESEL]], <6 x i8> poison, <3 x i32> <i32 0, i32 1, i32 2>
; CHECK-NEXT: ret <3 x i8> [[R]]
;
%widecmp = shufflevector <4 x i1> %cmp, <4 x i1> poison, <6 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef>
%widesel = select <6 x i1> %widecmp, <6 x i8> %x, <6 x i8> %y
%r = shufflevector <6 x i8> %widesel, <6 x i8> poison, <3 x i32> <i32 0, i32 1, i32 2>
ret <3 x i8> %r
}
; Narrowing constants does not require creating new narrowing shuffle instructions.
define <2 x i8> @narrow_shuffle_of_select_consts(<2 x i1> %cmp) {
; CHECK-LABEL: @narrow_shuffle_of_select_consts(
; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> <i8 -1, i8 -2>, <2 x i8> <i8 1, i8 2>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widesel = select <4 x i1> %widecmp, <4 x i8> <i8 -1, i8 -2, i8 -3, i8 -4>, <4 x i8> <i8 1, i8 2, i8 3, i8 4>
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}
; PR38691 - https://bugs.llvm.org/show_bug.cgi?id=38691
; If the operands are widened only to be narrowed back, then all of the shuffles are unnecessary.
define <2 x i8> @narrow_shuffle_of_select_with_widened_ops(<2 x i1> %cmp, <2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_with_widened_ops(
; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[CMP:%.*]], <2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]]
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widex = shufflevector <2 x i8> %x, <2 x i8> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widey = shufflevector <2 x i8> %y, <2 x i8> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> poison, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef>
%widesel = select <4 x i1> %widecmp, <4 x i8> %widex, <4 x i8> %widey
%r = shufflevector <4 x i8> %widesel, <4 x i8> poison, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}