derek.holloway
7502bf64a4
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40 lines
809 B
LLVM
40 lines
809 B
LLVM
; RUN: opt -passes=dse -S < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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%t = type { i32 }
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@g = global i32 42
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define void @test1(ptr noalias %pp) {
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store i32 1, ptr %pp; <-- This is dead
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%x = load i32, ptr inttoptr (i32 12345 to ptr)
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store i32 %x, ptr %pp
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ret void
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; CHECK-LABEL: define void @test1(
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; CHECK: store
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; CHECK-NOT: store
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; CHECK: ret void
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}
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define void @test3() {
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store i32 1, ptr @g; <-- This is dead.
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store i32 42, ptr @g
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ret void
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; CHECK-LABEL: define void @test3(
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; CHECK: store
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; CHECK-NOT: store
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; CHECK: ret void
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}
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define void @test4(ptr %p) {
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store i32 1, ptr %p
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%x = load i32, ptr @g; <-- %p and @g could alias
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store i32 %x, ptr %p
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ret void
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; CHECK-LABEL: define void @test4(
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; CHECK: store
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; CHECK: store
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; CHECK: ret void
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}
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