-; RUN: opt < %s -dse -S | \
-; RUN: not grep {store i8}
+; 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"
+
; Ensure that the dead store is deleted in this case. It is wholely
; overwritten by the second store.
-define i32 @test() {
- %V = alloca i32 ; <i32*> [#uses=3]
+define void @test1(i32 *%V) {
%V2 = bitcast i32* %V to i8* ; <i8*> [#uses=1]
store i8 0, i8* %V2
store i32 1234567, i32* %V
- %X = load i32* %V ; <i32> [#uses=1]
- ret i32 %X
+ ret void
+; CHECK-LABEL: @test1(
+; CHECK-NEXT: store i32 1234567
+}
+
+; Note that we could do better by merging the two stores into one.
+define void @test2(i32* %P) {
+; CHECK-LABEL: @test2(
+ store i32 0, i32* %P
+; CHECK: store i32
+ %Q = bitcast i32* %P to i16*
+ store i16 1, i16* %Q
+; CHECK: store i16
+ ret void
+}
+
+
+define i32 @test3(double %__x) {
+; CHECK-LABEL: @test3(
+; CHECK: store double
+ %__u = alloca { [3 x i32] }
+ %tmp.1 = bitcast { [3 x i32] }* %__u to double*
+ store double %__x, double* %tmp.1
+ %tmp.4 = getelementptr { [3 x i32] }, { [3 x i32] }* %__u, i32 0, i32 0, i32 1
+ %tmp.5 = load i32, i32* %tmp.4
+ %tmp.6 = icmp slt i32 %tmp.5, 0
+ %tmp.7 = zext i1 %tmp.6 to i32
+ ret i32 %tmp.7
+}
+
+; PR6043
+define void @test4(i8* %P) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT: bitcast
+; CHECK-NEXT: store double
+
+ store i8 19, i8* %P ;; dead
+ %A = getelementptr i8, i8* %P, i32 3
+
+ store i8 42, i8* %A ;; dead
+
+ %Q = bitcast i8* %P to double*
+ store double 0.0, double* %Q
+ ret void
+}
+
+; PR8657
+declare void @test5a(i32*)
+define void @test5(i32 %i) nounwind ssp {
+ %A = alloca i32
+ %B = bitcast i32* %A to i8*
+ %C = getelementptr i8, i8* %B, i32 %i
+ store i8 10, i8* %C ;; Dead store to variable index.
+ store i32 20, i32* %A
+
+ call void @test5a(i32* %A)
+ ret void
+; CHECK-LABEL: @test5(
+; CHECK-NEXT: alloca
+; CHECK-NEXT: store i32 20
+; CHECK-NEXT: call void @test5a
}
+declare void @test5a_as1(i32*)
+define void @test5_addrspacecast(i32 %i) nounwind ssp {
+ %A = alloca i32
+ %B = addrspacecast i32* %A to i8 addrspace(1)*
+ %C = getelementptr i8, i8 addrspace(1)* %B, i32 %i
+ store i8 10, i8 addrspace(1)* %C ;; Dead store to variable index.
+ store i32 20, i32* %A
+
+ call void @test5a(i32* %A)
+ ret void
+; CHECK-LABEL: @test5_addrspacecast(
+; CHECK-NEXT: alloca
+; CHECK-NEXT: store i32 20
+; CHECK-NEXT: call void @test5a
+}