; 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 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: @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: @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: @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] }* %__u, i32 0, i32 0, i32 1 | |
%tmp.5 = load 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: @test4 | |
; CHECK-NEXT: bitcast | |
; CHECK-NEXT: store double | |
store i8 19, i8* %P ;; dead | |
%A = getelementptr 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* %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: @test5( | |
; CHECK-NEXT: alloca | |
; CHECK-NEXT: store i32 20 | |
; CHECK-NEXT: call void @test5a | |
} |