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; RUN: opt < %s -instcombine -S | FileCheck %s
define void @test1(i32* %P) {
store i32 undef, i32* %P
store i32 123, i32* undef
store i32 124, i32* null
ret void
; CHECK-LABEL: @test1(
; CHECK-NEXT: store i32 123, i32* undef
; CHECK-NEXT: store i32 undef, i32* null
; CHECK-NEXT: ret void
}
define void @test2(i32* %P) {
%X = load i32* %P ; <i32> [#uses=1]
%Y = add i32 %X, 0 ; <i32> [#uses=1]
store i32 %Y, i32* %P
ret void
; CHECK-LABEL: @test2(
; CHECK-NEXT: ret void
}
;; Simple sinking tests
; "if then else"
define i32 @test3(i1 %C) {
%A = alloca i32
br i1 %C, label %Cond, label %Cond2
Cond:
store i32 -987654321, i32* %A
br label %Cont
Cond2:
store i32 47, i32* %A
br label %Cont
Cont:
%V = load i32* %A
ret i32 %V
; CHECK-LABEL: @test3(
; CHECK-NOT: alloca
; CHECK: Cont:
; CHECK-NEXT: %storemerge = phi i32 [ 47, %Cond2 ], [ -987654321, %Cond ]
; CHECK-NEXT: ret i32 %storemerge
}
; "if then"
define i32 @test4(i1 %C) {
%A = alloca i32
store i32 47, i32* %A
br i1 %C, label %Cond, label %Cont
Cond:
store i32 -987654321, i32* %A
br label %Cont
Cont:
%V = load i32* %A
ret i32 %V
; CHECK-LABEL: @test4(
; CHECK-NOT: alloca
; CHECK: Cont:
; CHECK-NEXT: %storemerge = phi i32 [ -987654321, %Cond ], [ 47, %0 ]
; CHECK-NEXT: ret i32 %storemerge
}
; "if then"
define void @test5(i1 %C, i32* %P) {
store i32 47, i32* %P, align 1
br i1 %C, label %Cond, label %Cont
Cond:
store i32 -987654321, i32* %P, align 1
br label %Cont
Cont:
ret void
; CHECK-LABEL: @test5(
; CHECK: Cont:
; CHECK-NEXT: %storemerge = phi i32
; CHECK-NEXT: store i32 %storemerge, i32* %P, align 1
; CHECK-NEXT: ret void
}
; PR14753 - merging two stores should preserve the TBAA tag.
define void @test6(i32 %n, float* %a, i32* %gi) nounwind uwtable ssp {
entry:
store i32 42, i32* %gi, align 4, !tbaa !0
br label %for.cond
for.cond: ; preds = %for.body, %entry
%storemerge = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i32* %gi, align 4, !tbaa !0
%cmp = icmp slt i32 %0, %n
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%idxprom = sext i32 %0 to i64
%arrayidx = getelementptr inbounds float* %a, i64 %idxprom
store float 0.000000e+00, float* %arrayidx, align 4, !tbaa !3
%1 = load i32* %gi, align 4, !tbaa !0
%inc = add nsw i32 %1, 1
store i32 %inc, i32* %gi, align 4, !tbaa !0
br label %for.cond
for.end: ; preds = %for.cond
ret void
; CHECK-LABEL: @test6(
; CHECK: for.cond:
; CHECK-NEXT: phi i32 [ 42
; CHECK-NEXT: store i32 %storemerge, i32* %gi, align 4, !tbaa !0
}
!0 = !{!4, !4, i64 0}
!1 = !{!"omnipotent char", !2}
!2 = !{!"Simple C/C++ TBAA"}
!3 = !{!"float", !1}
!4 = !{!"int", !1}
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