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[InstCombine] Add test for displaced shift fold with or disjoint (NFC)

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This commit is contained in:
Nikita Popov 2023-12-07 14:55:59 +01:00
parent e825cc4eba
commit 04697aa18a
1 changed files with 32 additions and 0 deletions
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32
llvm/test/Transforms/InstCombine/binop-of-displaced-shifts.ll
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@ -328,3 +328,35 @@ define <2 x i8> @shl_or_non_splat_out_of_range(<2 x i8> %x) {
%binop = or <2 x i8> %shift, %shift2
ret <2 x i8> %binop
}
define i8 @shl_or_with_or_disjoint_instead_of_add(i8 %x) {
; CHECK-LABEL: define i8 @shl_or_with_or_disjoint_instead_of_add
; CHECK-SAME: (i8 [[X:%.*]]) {
; CHECK-NEXT: [[SHIFT:%.*]] = shl i8 16, [[X]]
; CHECK-NEXT: [[ADD:%.*]] = or disjoint i8 [[X]], 1
; CHECK-NEXT: [[SHIFT2:%.*]] = shl i8 3, [[ADD]]
; CHECK-NEXT: [[BINOP:%.*]] = or i8 [[SHIFT]], [[SHIFT2]]
; CHECK-NEXT: ret i8 [[BINOP]]
;
%shift = shl i8 16, %x
%add = or disjoint i8 %x, 1
%shift2 = shl i8 3, %add
%binop = or i8 %shift, %shift2
ret i8 %binop
}
define i8 @shl_or_with_or_instead_of_add(i8 %x) {
; CHECK-LABEL: define i8 @shl_or_with_or_instead_of_add
; CHECK-SAME: (i8 [[X:%.*]]) {
; CHECK-NEXT: [[SHIFT:%.*]] = shl i8 16, [[X]]
; CHECK-NEXT: [[ADD:%.*]] = or i8 [[X]], 1
; CHECK-NEXT: [[SHIFT2:%.*]] = shl i8 3, [[ADD]]
; CHECK-NEXT: [[BINOP:%.*]] = or i8 [[SHIFT]], [[SHIFT2]]
; CHECK-NEXT: ret i8 [[BINOP]]
;
%shift = shl i8 16, %x
%add = or i8 %x, 1
%shift2 = shl i8 3, %add
%binop = or i8 %shift, %shift2
ret i8 %binop
}