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Ignore lifetime intrinsics in use list for MemCpyOptimizer. Patch by Luqman Aden, review by Hal Finkel.

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llvm-svn: 216865
This commit is contained in:
Nick Lewycky 2014-09-01 06:03:11 +00:00
parent ea9374b1f2
commit 979b095131
2 changed files with 32 additions and 0 deletions
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4
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -679,6 +679,10 @@ bool MemCpyOpt::performCallSlotOptzn(Instruction *cpy,
srcUseList.push_back(UU); srcUseList.push_back(UU);
else else
return false; return false;
} else if (const IntrinsicInst *IT = dyn_cast<IntrinsicInst>(U)) {
if (IT->getIntrinsicID() != Intrinsic::lifetime_start &&
IT->getIntrinsicID() != Intrinsic::lifetime_end)
continue;
} else if (U != C && U != cpy) { } else if (U != C && U != cpy) {
return false; return false;
} }

28
test/Transforms/MemCpyOpt/memcpy-to-memset-with-lifetimes.ll Normal file
View File

@ -0,0 +1,28 @@
; RUN: opt -basicaa -memcpyopt -instcombine -S < %s | FileCheck %s
target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @foo([8 x i64]* noalias nocapture sret dereferenceable(64)) {
entry-block:
%a = alloca [8 x i64], align 8
%1 = bitcast [8 x i64]* %a to i8*
call void @llvm.lifetime.start(i64 64, i8* %1)
call void @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 64, i32 8, i1 false)
%2 = bitcast [8 x i64]* %0 to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %2, i8* %1, i64 64, i32 8, i1 false)
call void @llvm.lifetime.end(i64 64, i8* %1)
ret void
; CHECK-LABEL: @foo(
; CHECK: %1 = bitcast
; CHECK: call void @llvm.memset
; CHECK-NOT: call void @llvm.memcpy
; CHECK: ret void
}
declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind