1 ; RUN: opt < %s -basicaa -gvn -dse -S | FileCheck %s
2 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"
4 declare void @llvm.memset.i32(i8*, i8, i32, i32)
5 declare void @llvm.memset.i8(i8*, i8, i8, i32)
6 declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
7 declare void @llvm.lifetime.end(i64, i8* nocapture)
9 declare void @external(i32*)
11 define i32 @test0(i8* %P) {
13 call void @external(i32* %A)
17 call void @llvm.memset.i32(i8* %P, i8 0, i32 42, i32 1)
26 declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
33 store i8 2, i8* %B ;; Not written to by memcpy
35 call void @llvm.memcpy.i8(i8* %A, i8* %B, i8 -1, i32 0)
42 define i8 @test2(i8* %P) {
44 %P2 = getelementptr i8* %P, i32 127
45 store i8 1, i8* %P2 ;; Not dead across memset
46 call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
52 define i8 @test2a(i8* %P) {
54 %P2 = getelementptr i8* %P, i32 126
56 ;; FIXME: DSE isn't zapping this dead store.
57 store i8 1, i8* %P2 ;; Dead, clobbered by memset.
59 call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
62 ; CHECK: %A = load i8* %P2
66 define void @test3(i8* %P, i8 %X) {
70 %Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
72 %P2 = getelementptr i8* %P, i32 2
73 store i8 %Y, i8* %P2 ;; Not read by lifetime.end, should be removed.
74 ; CHECK: store i8 2, i8* %P2
75 call void @llvm.lifetime.end(i64 1, i8* %P)
82 define void @test3a(i8* %P, i8 %X) {
84 %Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
86 %P2 = getelementptr i8* %P, i32 2
87 store i8 %Y, i8* %P2 ;; FIXME: Killed by llvm.lifetime.end, should be zapped.
88 ; CHECK: store i8 %Y, i8* %P2
89 call void @llvm.lifetime.end(i64 10, i8* %P)