derek.holloway
7502bf64a4
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41 lines
1.2 KiB
LLVM
41 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=dse < %s | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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declare void @llvm.lifetime.start.p0(ptr nocapture) nounwind
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declare void @llvm.lifetime.end.p0(ptr nocapture) nounwind
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declare void @llvm.memset.p0.i8(ptr nocapture, i8, i8, i1) nounwind
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define void @test1() {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[A:%.*]] = alloca i8, align 1
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr [[A]])
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; CHECK-NEXT: ret void
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;
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%A = alloca i8
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store i8 0, ptr %A ;; Written to by memset
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call void @llvm.lifetime.end.p0(ptr %A)
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call void @llvm.memset.p0.i8(ptr %A, i8 0, i8 -1, i1 false)
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ret void
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}
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define void @test2(ptr %P) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[Q:%.*]] = alloca i32, align 4
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr [[Q]])
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr [[Q]])
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; CHECK-NEXT: ret void
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;
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%Q = alloca i32
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call void @llvm.lifetime.start.p0(ptr %Q)
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store i32 0, ptr %Q ;; This store is dead.
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call void @llvm.lifetime.end.p0(ptr %Q)
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ret void
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}
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declare void @use(ptr) readonly
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