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authorDimitry Andric <dim@FreeBSD.org>2017-12-18 20:10:56 +0000
committerDimitry Andric <dim@FreeBSD.org>2017-12-18 20:10:56 +0000
commit044eb2f6afba375a914ac9d8024f8f5142bb912e (patch)
tree1475247dc9f9fe5be155ebd4c9069c75aadf8c20 /lib/CodeGen/Analysis.cpp
parenteb70dddbd77e120e5d490bd8fbe7ff3f8fa81c6b (diff)
Notes
Diffstat (limited to 'lib/CodeGen/Analysis.cpp')
-rw-r--r--lib/CodeGen/Analysis.cpp27
1 files changed, 22 insertions, 5 deletions
diff --git a/lib/CodeGen/Analysis.cpp b/lib/CodeGen/Analysis.cpp
index c2aecc651b79..0731ae575437 100644
--- a/lib/CodeGen/Analysis.cpp
+++ b/lib/CodeGen/Analysis.cpp
@@ -14,7 +14,9 @@
#include "llvm/CodeGen/Analysis.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/TargetInstrInfo.h"
+#include "llvm/CodeGen/TargetLowering.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
@@ -24,9 +26,6 @@
#include "llvm/IR/Module.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetSubtargetInfo.h"
#include "llvm/Transforms/Utils/GlobalStatus.h"
using namespace llvm;
@@ -565,6 +564,24 @@ bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
return false;
const Value *RetVal = Ret->getOperand(0), *CallVal = I;
+ // Intrinsic like llvm.memcpy has no return value, but the expanded
+ // libcall may or may not have return value. On most platforms, it
+ // will be expanded as memcpy in libc, which returns the first
+ // argument. On other platforms like arm-none-eabi, memcpy may be
+ // expanded as library call without return value, like __aeabi_memcpy.
+ const CallInst *Call = cast<CallInst>(I);
+ if (Function *F = Call->getCalledFunction()) {
+ Intrinsic::ID IID = F->getIntrinsicID();
+ if (((IID == Intrinsic::memcpy &&
+ TLI.getLibcallName(RTLIB::MEMCPY) == StringRef("memcpy")) ||
+ (IID == Intrinsic::memmove &&
+ TLI.getLibcallName(RTLIB::MEMMOVE) == StringRef("memmove")) ||
+ (IID == Intrinsic::memset &&
+ TLI.getLibcallName(RTLIB::MEMSET) == StringRef("memset"))) &&
+ RetVal == Call->getArgOperand(0))
+ return true;
+ }
+
SmallVector<unsigned, 4> RetPath, CallPath;
SmallVector<CompositeType *, 4> RetSubTypes, CallSubTypes;
@@ -651,7 +668,7 @@ llvm::getFuncletMembership(const MachineFunction &MF) {
int EntryBBNumber = MF.front().getNumber();
bool IsSEH = isAsynchronousEHPersonality(
- classifyEHPersonality(MF.getFunction()->getPersonalityFn()));
+ classifyEHPersonality(MF.getFunction().getPersonalityFn()));
const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
SmallVector<const MachineBasicBlock *, 16> FuncletBlocks;