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llvm-6502/test/Transforms/DeadStoreElimination/lifetime.ll
Dan Gohman c1be92f3bb Make BasicAliasAnalysis a normal AliasAnalysis implementation which
does normal initialization and normal chaining. Change the default
AliasAnalysis implementation to NoAlias.

Update StandardCompileOpts.h and friends to explicitly request
BasicAliasAnalysis.

Update tests to explicitly request -basicaa.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116720 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-18 18:04:47 +00:00

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LLVM

; RUN: opt -S -basicaa -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(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
declare void @llvm.memset.i8(i8*, i8, i8, i32)
define void @test1() {
; CHECK: @test1
%A = alloca i8
store i8 0, i8* %A ;; Written to by memset
call void @llvm.lifetime.end(i64 1, i8* %A)
; CHECK: lifetime.end
call void @llvm.memset.i8(i8* %A, i8 0, i8 -1, i32 0)
; CHECK-NOT: memset
ret void
; CHECK: ret void
}
define void @test2(i32* %P) {
; CHECK: test2
%Q = getelementptr i32* %P, i32 1
%R = bitcast i32* %Q to i8*
call void @llvm.lifetime.start(i64 4, i8* %R)
; CHECK: lifetime.start
store i32 0, i32* %Q ;; This store is dead.
; CHECK-NOT: store
call void @llvm.lifetime.end(i64 4, i8* %R)
; CHECK: lifetime.end
ret void
}