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79 lines
1.6 KiB
LLVM
79 lines
1.6 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test1(i32 %X, i8 %A) {
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%shift.upgrd.1 = zext i8 %A to i32 ; <i32> [#uses=1]
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; can be logical shift.
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%Y = ashr i32 %X, %shift.upgrd.1 ; <i32> [#uses=1]
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%Z = and i32 %Y, 1 ; <i32> [#uses=1]
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ret i32 %Z
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; CHECK: @test1
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; CHECK: lshr i32 %X, %shift.upgrd.1
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}
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define i32 @test2(i8 %tmp) {
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%tmp3 = zext i8 %tmp to i32 ; <i32> [#uses=1]
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%tmp4 = add i32 %tmp3, 7 ; <i32> [#uses=1]
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%tmp5 = ashr i32 %tmp4, 3 ; <i32> [#uses=1]
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ret i32 %tmp5
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; CHECK: @test2
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; CHECK: lshr i32 %tmp4, 3
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}
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define i64 @test3(i1 %X, i64 %Y, i1 %Cond) {
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br i1 %Cond, label %T, label %F
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T:
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%X2 = sext i1 %X to i64
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br label %C
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F:
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%Y2 = ashr i64 %Y, 63
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br label %C
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C:
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%P = phi i64 [%X2, %T], [%Y2, %F]
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%S = ashr i64 %P, 12
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ret i64 %S
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; CHECK: @test3
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; CHECK: %P = phi i64
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; CHECK-NEXT: ret i64 %P
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}
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define i64 @test4(i1 %X, i64 %Y, i1 %Cond) {
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br i1 %Cond, label %T, label %F
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T:
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%X2 = sext i1 %X to i64
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br label %C
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F:
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%Y2 = ashr i64 %Y, 63
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br label %C
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C:
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%P = phi i64 [%X2, %T], [%Y2, %F]
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%R = shl i64 %P, 12
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%S = ashr i64 %R, 12
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ret i64 %S
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; CHECK: @test4
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; CHECK: %P = phi i64
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; CHECK-NEXT: ret i64 %P
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}
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; rdar://7732987
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define i32 @test5(i32 %Y) {
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br i1 undef, label %A, label %C
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A:
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br i1 undef, label %B, label %D
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B:
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br label %D
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C:
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br i1 undef, label %D, label %E
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D:
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%P = phi i32 [0, %A], [0, %B], [%Y, %C]
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%S = ashr i32 %P, 16
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ret i32 %S
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; CHECK: @test5
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; CHECK: %P = phi i32
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; CHECK-NEXT: ashr i32 %P, 16
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E:
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ret i32 0
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}
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