1ddb3a369f
This adjusts the description of `llvm.memcpy` to also allow operands to be equal. This is in line with what Clang currently expects. This change is intended to be temporary and followed by re-introduce a variant with the non-overlapping guarantee for cases where we can actually ensure that property in the front-end. See the links below for more details: http://lists.llvm.org/pipermail/cfe-dev/2020-August/066614.html and PR11763. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D86815
17 lines
617 B
LLVM
17 lines
617 B
LLVM
; RUN: opt -disable-output -basic-aa -enable-new-pm=0 -print-memoryssa %s 2>&1 | FileCheck %s
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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define void @source_clobber(i8* %a, i8* %b) {
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; CHECK-LABEL: @source_clobber(
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; CHECK-NEXT: ; 1 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a, i8* %b, i64 128, i1 false)
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; CHECK-NEXT: ; MemoryUse(1) MayAlias
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; CHECK-NEXT: [[X:%.*]] = load i8, i8* %b
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; CHECK-NEXT: ret void
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;
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a, i8* %b, i64 128, i1 false)
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%x = load i8, i8* %b
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ret void
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}
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