9d172c8e9c
This switches to using DSE + MemorySSA by default again, after fixing the issues reported after the first commit. Notable fixesfc82006331,a0017c2bc2. This reverts commit3a59628f3c.
36 lines
1.0 KiB
LLVM
36 lines
1.0 KiB
LLVM
; RUN: opt -S -basic-aa -dse < %s | FileCheck %s
|
|
|
|
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"
|
|
|
|
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
|
|
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
|
|
declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i1) nounwind
|
|
|
|
define void @test1() {
|
|
; CHECK-LABEL: @test1(
|
|
%A = alloca i8
|
|
|
|
store i8 0, i8* %A ;; Written to by memset
|
|
call void @llvm.lifetime.end.p0i8(i64 1, i8* %A)
|
|
; CHECK: lifetime.end
|
|
|
|
call void @llvm.memset.p0i8.i8(i8* %A, i8 0, i8 -1, i1 false)
|
|
; CHECK-NOT: memset
|
|
|
|
ret void
|
|
; CHECK: ret void
|
|
}
|
|
|
|
define void @test2(i32* %P) {
|
|
; CHECK: test2
|
|
%Q = getelementptr i32, i32* %P, i32 1
|
|
%R = bitcast i32* %Q to i8*
|
|
call void @llvm.lifetime.start.p0i8(i64 4, i8* %R)
|
|
; CHECK: lifetime.start
|
|
store i32 0, i32* %Q ;; This store is dead.
|
|
; CHECK-NOT: store
|
|
call void @llvm.lifetime.end.p0i8(i64 4, i8* %R)
|
|
; CHECK: lifetime.end
|
|
ret void
|
|
}
|