forked from OSchip/llvm-project
88 lines
2.3 KiB
LLVM
88 lines
2.3 KiB
LLVM
; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -enable-dse-partial-store-merging=false -S | FileCheck %s
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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"
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; Ensure that the dead store is deleted in this case. It is wholely
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; overwritten by the second store.
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define void @test1(i32 *%V) {
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%V2 = bitcast i32* %V to i8* ; <i8*> [#uses=1]
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store i8 0, i8* %V2
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store i32 1234567, i32* %V
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ret void
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: store i32 1234567
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}
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; Note that we could do better by merging the two stores into one.
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define void @test2(i32* %P) {
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; CHECK-LABEL: @test2(
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store i32 0, i32* %P
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; CHECK: store i32
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%Q = bitcast i32* %P to i16*
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store i16 1, i16* %Q
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; CHECK: store i16
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ret void
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}
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define i32 @test3(double %__x) {
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; CHECK-LABEL: @test3(
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; CHECK: store double
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%__u = alloca { [3 x i32] }
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%tmp.1 = bitcast { [3 x i32] }* %__u to double*
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store double %__x, double* %tmp.1
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%tmp.4 = getelementptr { [3 x i32] }, { [3 x i32] }* %__u, i32 0, i32 0, i32 1
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%tmp.5 = load i32, i32* %tmp.4
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%tmp.6 = icmp slt i32 %tmp.5, 0
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%tmp.7 = zext i1 %tmp.6 to i32
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ret i32 %tmp.7
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}
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; PR6043
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define void @test4(i8* %P) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: store double
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store i8 19, i8* %P ;; dead
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%A = getelementptr i8, i8* %P, i32 3
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store i8 42, i8* %A ;; dead
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%Q = bitcast i8* %P to double*
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store double 0.0, double* %Q
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ret void
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}
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; PR8657
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declare void @test5a(i32*)
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define void @test5(i32 %i) nounwind ssp {
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%A = alloca i32
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%B = bitcast i32* %A to i8*
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%C = getelementptr i8, i8* %B, i32 %i
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store i8 10, i8* %C ;; Dead store to variable index.
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store i32 20, i32* %A
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call void @test5a(i32* %A)
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ret void
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: alloca
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; CHECK-NEXT: store i32 20
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; CHECK-NEXT: call void @test5a
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}
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declare void @test5a_as1(i32*)
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define void @test5_addrspacecast(i32 %i) nounwind ssp {
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%A = alloca i32
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%B = addrspacecast i32* %A to i8 addrspace(1)*
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%C = getelementptr i8, i8 addrspace(1)* %B, i32 %i
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store i8 10, i8 addrspace(1)* %C ;; Dead store to variable index.
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store i32 20, i32* %A
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call void @test5a(i32* %A)
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ret void
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; CHECK-LABEL: @test5_addrspacecast(
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; CHECK-NEXT: alloca
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; CHECK-NEXT: store i32 20
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; CHECK-NEXT: call void @test5a
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}
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