derek.holloway
7502bf64a4
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80 lines
2.4 KiB
LLVM
80 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=globalopt -S < %s | FileCheck %s
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@G1 = internal global i32 5
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@G2 = internal global i32 5
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@G3 = internal global i32 5
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@G4 = internal global i32 5
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@G5 = internal global i32 5
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define i32 @test1() norecurse {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[G1:%.*]] = alloca i32, align 4
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; CHECK-NEXT: store i32 5, ptr [[G1]], align 4
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; CHECK-NEXT: store i32 4, ptr [[G1]], align 4
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; CHECK-NEXT: [[A:%.*]] = load i32, ptr [[G1]], align 4
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; CHECK-NEXT: ret i32 [[A]]
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;
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store i32 4, ptr @G1
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%a = load i32, ptr @G1
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ret i32 %a
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}
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; The load comes before the store which makes @G2 live before the call.
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define i32 @test2() norecurse {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[A_B:%.*]] = load i1, ptr @G2, align 1
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; CHECK-NEXT: [[A:%.*]] = select i1 [[A_B]], i32 4, i32 5
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; CHECK-NEXT: store i1 true, ptr @G2, align 1
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; CHECK-NEXT: ret i32 [[A]]
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;
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%a = load i32, ptr @G2
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store i32 4, ptr @G2
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ret i32 %a
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}
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; This global is indexed by a GEP - this makes it partial alias and we bail out.
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; FIXME: We don't actually have to bail out in this case.
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define i32 @test3() norecurse {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[A_B:%.*]] = load i1, ptr @G3, align 1
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; CHECK-NEXT: [[A:%.*]] = select i1 [[A_B]], i32 4, i32 5
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; CHECK-NEXT: store i1 true, ptr @G3, align 1
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; CHECK-NEXT: ret i32 [[A]]
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;
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%a = load i32, ptr @G3
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store i32 4, ptr @G3
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ret i32 %a
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}
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; The global is casted away to a larger type then loaded. The store only partially
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; covers the load, so we must not demote.
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define i32 @test4() norecurse {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: store i32 4, ptr @G4, align 4
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; CHECK-NEXT: [[A:%.*]] = load i64, ptr @G4, align 4
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; CHECK-NEXT: [[B:%.*]] = trunc i64 [[A]] to i32
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; CHECK-NEXT: ret i32 [[B]]
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;
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store i32 4, ptr @G4
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%a = load i64, ptr @G4
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%b = trunc i64 %a to i32
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ret i32 %b
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}
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; The global is casted away to a smaller type then loaded. This one is fine.
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define i32 @test5() norecurse {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[G5:%.*]] = alloca i32, align 4
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; CHECK-NEXT: store i32 5, ptr [[G5]], align 4
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; CHECK-NEXT: store i32 4, ptr [[G5]], align 4
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; CHECK-NEXT: [[A:%.*]] = load i16, ptr [[G5]], align 2
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; CHECK-NEXT: [[B:%.*]] = zext i16 [[A]] to i32
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; CHECK-NEXT: ret i32 [[B]]
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;
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store i32 4, ptr @G5
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%a = load i16, ptr @G5
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%b = zext i16 %a to i32
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ret i32 %b
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}
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