1 ; RUN: opt < %s -instcombine -S | FileCheck %s
3 define void @test1(i32* %P) {
4 store i32 undef, i32* %P
5 store i32 123, i32* undef
6 store i32 124, i32* null
9 ; CHECK-NEXT: store i32 123, i32* undef
10 ; CHECK-NEXT: store i32 undef, i32* null
11 ; CHECK-NEXT: ret void
14 define void @test2(i32* %P) {
15 %X = load i32* %P ; <i32> [#uses=1]
16 %Y = add i32 %X, 0 ; <i32> [#uses=1]
19 ; CHECK-LABEL: @test2(
20 ; CHECK-NEXT: ret void
23 ;; Simple sinking tests
26 define i32 @test3(i1 %C) {
28 br i1 %C, label %Cond, label %Cond2
31 store i32 -987654321, i32* %A
41 ; CHECK-LABEL: @test3(
44 ; CHECK-NEXT: %storemerge = phi i32 [ 47, %Cond2 ], [ -987654321, %Cond ]
45 ; CHECK-NEXT: ret i32 %storemerge
49 define i32 @test4(i1 %C) {
52 br i1 %C, label %Cond, label %Cont
55 store i32 -987654321, i32* %A
61 ; CHECK-LABEL: @test4(
64 ; CHECK-NEXT: %storemerge = phi i32 [ -987654321, %Cond ], [ 47, %0 ]
65 ; CHECK-NEXT: ret i32 %storemerge
69 define void @test5(i1 %C, i32* %P) {
70 store i32 47, i32* %P, align 1
71 br i1 %C, label %Cond, label %Cont
74 store i32 -987654321, i32* %P, align 1
79 ; CHECK-LABEL: @test5(
81 ; CHECK-NEXT: %storemerge = phi i32
82 ; CHECK-NEXT: store i32 %storemerge, i32* %P, align 1
83 ; CHECK-NEXT: ret void
87 ; PR14753 - merging two stores should preserve the TBAA tag.
88 define void @test6(i32 %n, float* %a, i32* %gi) nounwind uwtable ssp {
90 store i32 42, i32* %gi, align 4, !tbaa !0
93 for.cond: ; preds = %for.body, %entry
94 %storemerge = phi i32 [ 0, %entry ], [ %inc, %for.body ]
95 %0 = load i32* %gi, align 4, !tbaa !0
96 %cmp = icmp slt i32 %0, %n
97 br i1 %cmp, label %for.body, label %for.end
99 for.body: ; preds = %for.cond
100 %idxprom = sext i32 %0 to i64
101 %arrayidx = getelementptr inbounds float* %a, i64 %idxprom
102 store float 0.000000e+00, float* %arrayidx, align 4, !tbaa !3
103 %1 = load i32* %gi, align 4, !tbaa !0
104 %inc = add nsw i32 %1, 1
105 store i32 %inc, i32* %gi, align 4, !tbaa !0
108 for.end: ; preds = %for.cond
110 ; CHECK-LABEL: @test6(
112 ; CHECK-NEXT: phi i32 [ 42
113 ; CHECK-NEXT: store i32 %storemerge, i32* %gi, align 4, !tbaa !0
116 !0 = metadata !{metadata !4, metadata !4, i64 0}
117 !1 = metadata !{metadata !"omnipotent char", metadata !2}
118 !2 = metadata !{metadata !"Simple C/C++ TBAA"}
119 !3 = metadata !{metadata !"float", metadata !1}
120 !4 = metadata !{metadata !"int", metadata !1}