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03bc2a070d
Summary: If the only use of a value is a start or end lifetime intrinsic then mark the intrinsic as trivially dead. This should allow for that value to then be removed as well. Currently, this only works for allocas, globals, and arguments. Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D79355
74 lines
2.5 KiB
LLVM
74 lines
2.5 KiB
LLVM
; RUN: opt -debugify -dce -S < %s | FileCheck %s
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; RUN: opt -passes='module(debugify),function(dce)' -S < %s | FileCheck %s
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; CHECK-LABEL: @test
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define void @test() {
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%add = add i32 1, 2
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[add:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_stack_value))
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%sub = sub i32 %add, 1
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[sub:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value))
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; CHECK-NEXT: ret void
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ret void
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}
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
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; CHECK-LABEL: @test_lifetime_alloca
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define i32 @test_lifetime_alloca() {
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; Check that lifetime intrinsics are removed along with the pointer.
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; CHECK-NEXT: @llvm.dbg.value
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: llvm.lifetime.start
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; CHECK-NOT: llvm.lifetime.end
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%i = alloca i8, align 4
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* %i)
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* %i)
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ret i32 0
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}
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; CHECK-LABEL: @test_lifetime_arg
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define i32 @test_lifetime_arg(i8*) {
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; Check that lifetime intrinsics are removed along with the pointer.
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; CHECK-NEXT: llvm.dbg.value
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: llvm.lifetime.start
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; CHECK-NOT: llvm.lifetime.end
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* %0)
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* %0)
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ret i32 0
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}
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@glob = global i8 1
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; CHECK-LABEL: @test_lifetime_global
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define i32 @test_lifetime_global() {
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; Check that lifetime intrinsics are removed along with the pointer.
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; CHECK-NEXT: llvm.dbg.value
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: llvm.lifetime.start
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; CHECK-NOT: llvm.lifetime.end
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* @glob)
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* @glob)
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ret i32 0
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}
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; CHECK-LABEL: @test_lifetime_bitcast
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define i32 @test_lifetime_bitcast(i32*) {
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; Check that lifetime intrinsics are NOT removed when the pointer is a bitcast.
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; It's not uncommon for two bitcasts to be made: one for lifetime, one for use.
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; TODO: Support the above case.
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: llvm.dbg.value
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; CHECK-NEXT: llvm.lifetime.start
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; CHECK-NEXT: llvm.lifetime.end
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; CHECK-NEXT: ret i32 0
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%2 = bitcast i32* %0 to i8*
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call void @llvm.lifetime.start.p0i8(i64 -1, i8* %2)
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call void @llvm.lifetime.end.p0i8(i64 -1, i8* %2)
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ret i32 0
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}
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; CHECK: [[add]] = !DILocalVariable
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; CHECK: [[sub]] = !DILocalVariable
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