forked from OSchip/llvm-project
94 lines
4.4 KiB
LLVM
94 lines
4.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -enable-dse-memoryssa -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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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind
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declare void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* nocapture, i8, i64, i32) nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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declare void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
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declare void @llvm.init.trampoline(i8*, i8*, i8*)
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;; Overwrite of memset by memcpy.
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define void @test17(i8* %P, i8* noalias %Q) nounwind ssp {
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; CHECK-LABEL: @test17(
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; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P:%.*]], i8* [[Q:%.*]], i64 12, i1 false)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memset.p0i8.i64(i8* %P, i8 42, i64 8, i1 false)
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
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ret void
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}
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;; Overwrite of memset by memcpy.
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define void @test17_atomic(i8* %P, i8* noalias %Q) nounwind ssp {
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; CHECK-LABEL: @test17_atomic(
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; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i32 1)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* align 1 %P, i8 42, i64 8, i32 1)
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tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
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ret void
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}
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;; Overwrite of memset by memcpy. Overwrite is stronger atomicity. We can
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;; remove the memset.
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define void @test17_atomic_weaker(i8* %P, i8* noalias %Q) nounwind ssp {
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; CHECK-LABEL: @test17_atomic_weaker(
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; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i32 1)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memset.p0i8.i64(i8* align 1 %P, i8 42, i64 8, i1 false)
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tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
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ret void
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}
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;; Overwrite of memset by memcpy. Overwrite is weaker atomicity. We can remove
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;; the memset.
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define void @test17_atomic_weaker_2(i8* %P, i8* noalias %Q) nounwind ssp {
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; CHECK-LABEL: @test17_atomic_weaker_2(
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; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[Q:%.*]], i64 12, i1 false)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memset.element.unordered.atomic.p0i8.i64(i8* align 1 %P, i8 42, i64 8, i32 1)
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i1 false)
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ret void
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}
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; Should not delete the volatile memset.
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define void @test17v(i8* %P, i8* %Q) nounwind ssp {
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; CHECK-LABEL: @test17v(
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; CHECK-NEXT: tail call void @llvm.memset.p0i8.i64(i8* [[P:%.*]], i8 42, i64 8, i1 true)
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; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P]], i8* [[Q:%.*]], i64 12, i1 false)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memset.p0i8.i64(i8* %P, i8 42, i64 8, i1 true)
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
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ret void
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}
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; According to the current LangRef, memcpy's source and destination cannot
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; overlap, hence the first memcpy is dead.
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;
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; Previously this was not allowed (PR8728), also discussed in PR11763.
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define void @test18(i8* %P, i8* %Q, i8* %R) nounwind ssp {
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; CHECK-LABEL: @test18(
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; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[P:%.*]], i8* [[R:%.*]], i64 12, i1 false)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %Q, i64 12, i1 false)
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %P, i8* %R, i64 12, i1 false)
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ret void
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}
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define void @test18_atomic(i8* %P, i8* %Q, i8* %R) nounwind ssp {
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; CHECK-LABEL: @test18_atomic(
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; CHECK-NEXT: tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 [[P:%.*]], i8* align 1 [[R:%.*]], i64 12, i32 1)
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; CHECK-NEXT: ret void
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;
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tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %Q, i64 12, i32 1)
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tail call void @llvm.memcpy.element.unordered.atomic.p0i8.p0i8.i64(i8* align 1 %P, i8* align 1 %R, i64 12, i32 1)
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ret void
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}
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