derek.holloway
7502bf64a4
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61 lines
1.5 KiB
LLVM
61 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=mem2reg < %s -S | FileCheck %s
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declare i32 @def(i32)
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declare i1 @use(i32)
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; Special case of a single-BB alloca does not apply here since the load
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; is affected by the following store. Expect this case to be identified
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; and a PHI node to be created.
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define void @test1() {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[T_0:%.*]] = phi i32 [ undef, [[ENTRY:%.*]] ], [ [[N:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[C:%.*]] = call i1 @use(i32 [[T_0]])
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; CHECK-NEXT: [[N]] = call i32 @def(i32 7)
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; CHECK-NEXT: br i1 [[C]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%t = alloca i32
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br label %loop
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loop:
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%v = load i32, ptr %t
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%c = call i1 @use(i32 %v)
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%n = call i32 @def(i32 7)
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store i32 %n, ptr %t
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br i1 %c, label %loop, label %exit
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exit:
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ret void
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}
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; Same as above, except there is no following store. The alloca should just be
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; replaced with an undef
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define void @test2() {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[C:%.*]] = call i1 @use(i32 undef)
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; CHECK-NEXT: br i1 [[C]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%t = alloca i32
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br label %loop
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loop:
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%v = load i32, ptr %t
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%c = call i1 @use(i32 %v)
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br i1 %c, label %loop, label %exit
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exit:
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ret void
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}
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