9d172c8e9c
This switches to using DSE + MemorySSA by default again, after fixing the issues reported after the first commit. Notable fixes fc8200633122, a0017c2bc258. This reverts commit 3a59628f3cc26eb085acfc9cbdc97243ef71a6c5.
88 lines
2.3 KiB
LLVM
88 lines
2.3 KiB
LLVM
; RUN: opt < %s -basic-aa -dse -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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