1 ; RUN: opt < %s -basicaa -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" 3 4 ; Ensure that the dead store is deleted in this case. It is wholely 5 ; overwritten by the second store. 6 define void @test1(i32 *%V) { 7 %V2 = bitcast i32* %V to i8* ; <i8*> [#uses=1] 8 store i8 0, i8* %V2 9 store i32 1234567, i32* %V 10 ret void 11 ; CHECK: @test1 12 ; CHECK-NEXT: store i32 1234567 13 } 14 15 ; Note that we could do better by merging the two stores into one. 16 define void @test2(i32* %P) { 17 ; CHECK: @test2 18 store i32 0, i32* %P 19 ; CHECK: store i32 20 %Q = bitcast i32* %P to i16* 21 store i16 1, i16* %Q 22 ; CHECK: store i16 23 ret void 24 } 25 26 27 define i32 @test3(double %__x) { 28 ; CHECK: @test3 29 ; CHECK: store double 30 %__u = alloca { [3 x i32] } 31 %tmp.1 = bitcast { [3 x i32] }* %__u to double* 32 store double %__x, double* %tmp.1 33 %tmp.4 = getelementptr { [3 x i32] }* %__u, i32 0, i32 0, i32 1 34 %tmp.5 = load i32* %tmp.4 35 %tmp.6 = icmp slt i32 %tmp.5, 0 36 %tmp.7 = zext i1 %tmp.6 to i32 37 ret i32 %tmp.7 38 } 39 40 ; PR6043 41 define void @test4(i8* %P) { 42 ; CHECK: @test4 43 ; CHECK-NEXT: bitcast 44 ; CHECK-NEXT: store double 45 46 store i8 19, i8* %P ;; dead 47 %A = getelementptr i8* %P, i32 3 48 49 store i8 42, i8* %A ;; dead 50 51 %Q = bitcast i8* %P to double* 52 store double 0.0, double* %Q 53 ret void 54 } 55 56 ; PR8657 57 declare void @test5a(i32*) 58 define void @test5(i32 %i) nounwind ssp { 59 %A = alloca i32 60 %B = bitcast i32* %A to i8* 61 %C = getelementptr i8* %B, i32 %i 62 store i8 10, i8* %C ;; Dead store to variable index. 63 store i32 20, i32* %A 64 65 call void @test5a(i32* %A) 66 ret void 67 ; CHECK: @test5( 68 ; CHECK-NEXT: alloca 69 ; CHECK-NEXT: store i32 20 70 ; CHECK-NEXT: call void @test5a 71 } 72
