| ; RUN: opt < %s -basic-aa -dse -enable-dse-partial-store-merging=false -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 void @test1(i32 *%V) { |
| %V2 = bitcast i32* %V to i8* ; <i8*> [#uses=1] |
| store i8 0, i8* %V2 |
| store i32 1234567, i32* %V |
| 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 |
| } |