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instcombine: Migrate strcat and strncat optimizations
This patch migrates the strcat and strncat optimizations from the simplify-libcalls pass into the instcombine library call simplifier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165874 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
parent
5e8904576a
commit
73d8a5864f
@ -133,105 +133,7 @@ static bool IsOnlyUsedInEqualityComparison(Value *V, Value *With) {
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// String and Memory LibCall Optimizations
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//===----------------------------------------------------------------------===//
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//===---------------------------------------===//
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// 'strcat' Optimizations
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namespace {
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struct StrCatOpt : public LibCallOptimization {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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// Verify the "strcat" function prototype.
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FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 2 ||
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FT->getReturnType() != B.getInt8PtrTy() ||
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FT->getParamType(0) != FT->getReturnType() ||
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FT->getParamType(1) != FT->getReturnType())
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return 0;
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// Extract some information from the instruction
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Value *Dst = CI->getArgOperand(0);
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Value *Src = CI->getArgOperand(1);
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// See if we can get the length of the input string.
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uint64_t Len = GetStringLength(Src);
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if (Len == 0) return 0;
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--Len; // Unbias length.
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// Handle the simple, do-nothing case: strcat(x, "") -> x
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if (Len == 0)
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return Dst;
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// These optimizations require DataLayout.
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if (!TD) return 0;
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return EmitStrLenMemCpy(Src, Dst, Len, B);
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}
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Value *EmitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B) {
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// We need to find the end of the destination string. That's where the
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// memory is to be moved to. We just generate a call to strlen.
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Value *DstLen = EmitStrLen(Dst, B, TD, TLI);
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if (!DstLen)
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return 0;
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// Now that we have the destination's length, we must index into the
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// destination's pointer to get the actual memcpy destination (end of
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// the string .. we're concatenating).
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Value *CpyDst = B.CreateGEP(Dst, DstLen, "endptr");
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// We have enough information to now generate the memcpy call to do the
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// concatenation for us. Make a memcpy to copy the nul byte with align = 1.
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B.CreateMemCpy(CpyDst, Src,
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ConstantInt::get(TD->getIntPtrType(*Context), Len + 1), 1);
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return Dst;
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}
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};
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//===---------------------------------------===//
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// 'strncat' Optimizations
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struct StrNCatOpt : public StrCatOpt {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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// Verify the "strncat" function prototype.
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FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 3 ||
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FT->getReturnType() != B.getInt8PtrTy() ||
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FT->getParamType(0) != FT->getReturnType() ||
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FT->getParamType(1) != FT->getReturnType() ||
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!FT->getParamType(2)->isIntegerTy())
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return 0;
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// Extract some information from the instruction
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Value *Dst = CI->getArgOperand(0);
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Value *Src = CI->getArgOperand(1);
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uint64_t Len;
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// We don't do anything if length is not constant
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if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getArgOperand(2)))
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Len = LengthArg->getZExtValue();
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else
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return 0;
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// See if we can get the length of the input string.
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uint64_t SrcLen = GetStringLength(Src);
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if (SrcLen == 0) return 0;
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--SrcLen; // Unbias length.
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// Handle the simple, do-nothing cases:
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// strncat(x, "", c) -> x
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// strncat(x, c, 0) -> x
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if (SrcLen == 0 || Len == 0) return Dst;
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// These optimizations require DataLayout.
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if (!TD) return 0;
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// We don't optimize this case
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if (Len < SrcLen) return 0;
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// strncat(x, s, c) -> strcat(x, s)
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// s is constant so the strcat can be optimized further
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return EmitStrLenMemCpy(Src, Dst, SrcLen, B);
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}
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};
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//===---------------------------------------===//
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// 'strchr' Optimizations
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@ -1564,7 +1466,7 @@ namespace {
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StringMap<LibCallOptimization*> Optimizations;
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// String and Memory LibCall Optimizations
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StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrRChrOpt StrRChr;
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StrChrOpt StrChr; StrRChrOpt StrRChr;
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StrCmpOpt StrCmp; StrNCmpOpt StrNCmp;
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StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
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StpCpyOpt StpCpy; StpCpyOpt StpCpyChk;
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@ -1639,8 +1541,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
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/// we know.
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void SimplifyLibCalls::InitOptimizations() {
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// String and Memory LibCall Optimizations
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Optimizations["strcat"] = &StrCat;
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Optimizations["strncat"] = &StrNCat;
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Optimizations["strchr"] = &StrChr;
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Optimizations["strrchr"] = &StrRChr;
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Optimizations["strcmp"] = &StrCmp;
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@ -222,6 +222,104 @@ struct StrNCpyChkOpt : public InstFortifiedLibCallOptimization {
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}
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};
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//===----------------------------------------------------------------------===//
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// String and Memory Library Call Optimizations
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//===----------------------------------------------------------------------===//
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struct StrCatOpt : public LibCallOptimization {
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virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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// Verify the "strcat" function prototype.
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FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 2 ||
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FT->getReturnType() != B.getInt8PtrTy() ||
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FT->getParamType(0) != FT->getReturnType() ||
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FT->getParamType(1) != FT->getReturnType())
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return 0;
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// Extract some information from the instruction
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Value *Dst = CI->getArgOperand(0);
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Value *Src = CI->getArgOperand(1);
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// See if we can get the length of the input string.
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uint64_t Len = GetStringLength(Src);
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if (Len == 0) return 0;
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--Len; // Unbias length.
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// Handle the simple, do-nothing case: strcat(x, "") -> x
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if (Len == 0)
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return Dst;
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// These optimizations require DataLayout.
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if (!TD) return 0;
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return emitStrLenMemCpy(Src, Dst, Len, B);
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}
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Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len,
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IRBuilder<> &B) {
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// We need to find the end of the destination string. That's where the
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// memory is to be moved to. We just generate a call to strlen.
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Value *DstLen = EmitStrLen(Dst, B, TD, TLI);
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if (!DstLen)
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return 0;
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// Now that we have the destination's length, we must index into the
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// destination's pointer to get the actual memcpy destination (end of
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// the string .. we're concatenating).
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Value *CpyDst = B.CreateGEP(Dst, DstLen, "endptr");
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// We have enough information to now generate the memcpy call to do the
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// concatenation for us. Make a memcpy to copy the nul byte with align = 1.
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B.CreateMemCpy(CpyDst, Src,
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ConstantInt::get(TD->getIntPtrType(*Context), Len + 1), 1);
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return Dst;
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}
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};
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struct StrNCatOpt : public StrCatOpt {
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virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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// Verify the "strncat" function prototype.
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FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 3 ||
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FT->getReturnType() != B.getInt8PtrTy() ||
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FT->getParamType(0) != FT->getReturnType() ||
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FT->getParamType(1) != FT->getReturnType() ||
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!FT->getParamType(2)->isIntegerTy())
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return 0;
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// Extract some information from the instruction
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Value *Dst = CI->getArgOperand(0);
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Value *Src = CI->getArgOperand(1);
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uint64_t Len;
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// We don't do anything if length is not constant
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if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getArgOperand(2)))
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Len = LengthArg->getZExtValue();
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else
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return 0;
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// See if we can get the length of the input string.
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uint64_t SrcLen = GetStringLength(Src);
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if (SrcLen == 0) return 0;
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--SrcLen; // Unbias length.
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// Handle the simple, do-nothing cases:
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// strncat(x, "", c) -> x
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// strncat(x, c, 0) -> x
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if (SrcLen == 0 || Len == 0) return Dst;
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// These optimizations require DataLayout.
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if (!TD) return 0;
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// We don't optimize this case
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if (Len < SrcLen) return 0;
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// strncat(x, s, c) -> strcat(x, s)
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// s is constant so the strcat can be optimized further
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return emitStrLenMemCpy(Src, Dst, SrcLen, B);
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}
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};
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} // End anonymous namespace.
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namespace llvm {
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@ -239,6 +337,10 @@ class LibCallSimplifierImpl {
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StrCpyChkOpt StrCpyChk;
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StrNCpyChkOpt StrNCpyChk;
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// String and memory library call optimizations.
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StrCatOpt StrCat;
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StrNCatOpt StrNCat;
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void initOptimizations();
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public:
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LibCallSimplifierImpl(const DataLayout *TD, const TargetLibraryInfo *TLI) {
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@ -258,6 +360,10 @@ void LibCallSimplifierImpl::initOptimizations() {
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Optimizations["__stpcpy_chk"] = &StrCpyChk;
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Optimizations["__strncpy_chk"] = &StrNCpyChk;
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Optimizations["__stpncpy_chk"] = &StrNCpyChk;
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// String and memory library call optimizations.
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Optimizations["strcat"] = &StrCat;
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Optimizations["strncat"] = &StrNCat;
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}
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Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {
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38
test/Transforms/InstCombine/strcat-1.ll
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38
test/Transforms/InstCombine/strcat-1.ll
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@ -0,0 +1,38 @@
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; Test that the strcat libcall simplifier works correctly per the
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; bug found in PR3661.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@hello = constant [6 x i8] c"hello\00"
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@null = constant [1 x i8] zeroinitializer
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@null_hello = constant [7 x i8] c"\00hello\00"
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declare i8* @strcat(i8*, i8*)
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declare i32 @puts(i8*)
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define i32 @main() {
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; CHECK: @main
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; CHECK-NOT: call i8* @strcat
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; CHECK: call i32 @puts
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%target = alloca [1024 x i8]
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%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
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store i8 0, i8* %arg1
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; rslt1 = strcat(target, "hello\00")
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%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
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%rslt1 = call i8* @strcat(i8* %arg1, i8* %arg2)
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; rslt2 = strcat(rslt1, "\00")
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%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0
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%rslt2 = call i8* @strcat(i8* %rslt1, i8* %arg3)
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; rslt3 = strcat(rslt2, "\00hello\00")
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%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0
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%rslt3 = call i8* @strcat(i8* %rslt2, i8* %arg4)
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call i32 @puts( i8* %rslt3 )
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ret i32 0
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}
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32
test/Transforms/InstCombine/strcat-2.ll
Normal file
32
test/Transforms/InstCombine/strcat-2.ll
Normal file
@ -0,0 +1,32 @@
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; Test that the strcat libcall simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@hello = constant [6 x i8] c"hello\00"
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@empty = constant [1 x i8] c"\00"
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@a = common global [32 x i8] zeroinitializer, align 1
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declare i8* @strcat(i8*, i8*)
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define void @test_simplify1() {
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; CHECK: @test_simplify1
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; CHECK-NOT: call i8* @strcat
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; CHECK: ret void
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%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
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%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
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call i8* @strcat(i8* %dst, i8* %src)
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ret void
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}
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define void @test_simplify2() {
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; CHECK: @test_simplify2
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; CHECK-NEXT: ret void
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%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
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%src = getelementptr [1 x i8]* @empty, i32 0, i32 0
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call i8* @strcat(i8* %dst, i8* %src)
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ret void
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}
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22
test/Transforms/InstCombine/strcat-3.ll
Normal file
22
test/Transforms/InstCombine/strcat-3.ll
Normal file
@ -0,0 +1,22 @@
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; Test that the strcat libcall simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@hello = constant [6 x i8] c"hello\00"
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@empty = constant [1 x i8] c"\00"
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@a = common global [32 x i8] zeroinitializer, align 1
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declare i16* @strcat(i8*, i8*)
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define void @test_nosimplify1() {
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; CHECK: @test_nosimplify1
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; CHECK: call i16* @strcat
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; CHECK: ret void
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%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
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%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
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call i16* @strcat(i8* %dst, i8* %src)
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ret void
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}
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37
test/Transforms/InstCombine/strncat-1.ll
Normal file
37
test/Transforms/InstCombine/strncat-1.ll
Normal file
@ -0,0 +1,37 @@
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; Test that the strncat libcall simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@hello = constant [6 x i8] c"hello\00"
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@null = constant [1 x i8] zeroinitializer
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@null_hello = constant [7 x i8] c"\00hello\00"
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declare i8* @strncat(i8*, i8*, i32)
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declare i32 @puts(i8*)
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define i32 @main() {
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; CHECK: @main
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; CHECK-NOT: call i8* @strncat
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; CHECK: call i32 @puts
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%target = alloca [1024 x i8]
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%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
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store i8 0, i8* %arg1
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; rslt1 = strncat(target, "hello\00")
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%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
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%rslt1 = call i8* @strncat(i8* %arg1, i8* %arg2, i32 6)
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; rslt2 = strncat(rslt1, "\00")
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%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0
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%rslt2 = call i8* @strncat(i8* %rslt1, i8* %arg3, i32 42)
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; rslt3 = strncat(rslt2, "\00hello\00")
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%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0
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%rslt3 = call i8* @strncat(i8* %rslt2, i8* %arg4, i32 42)
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call i32 @puts(i8* %rslt3)
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ret i32 0
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}
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53
test/Transforms/InstCombine/strncat-2.ll
Normal file
53
test/Transforms/InstCombine/strncat-2.ll
Normal file
@ -0,0 +1,53 @@
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; Test that the strncat libcall simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@hello = constant [6 x i8] c"hello\00"
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@empty = constant [1 x i8] c"\00"
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@a = common global [32 x i8] zeroinitializer, align 1
|
||||
|
||||
declare i8* @strncat(i8*, i8*, i32)
|
||||
|
||||
define void @test_simplify1() {
|
||||
; CHECK: @test_simplify1
|
||||
; CHECK-NOT: call i8* @strncat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 13)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_simplify2() {
|
||||
; CHECK: @test_simplify2
|
||||
; CHECK-NEXT: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [1 x i8]* @empty, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 13)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_simplify3() {
|
||||
; CHECK: @test_simplify3
|
||||
; CHECK-NEXT: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 0)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_nosimplify1() {
|
||||
; CHECK: @test_nosimplify1
|
||||
; CHECK: call i8* @strncat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 1)
|
||||
ret void
|
||||
}
|
||||
22
test/Transforms/InstCombine/strncat-3.ll
Normal file
22
test/Transforms/InstCombine/strncat-3.ll
Normal file
@ -0,0 +1,22 @@
|
||||
; Test that the strncat libcall simplifier works correctly.
|
||||
;
|
||||
; RUN: opt < %s -instcombine -S | FileCheck %s
|
||||
|
||||
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@empty = constant [1 x i8] c"\00"
|
||||
@a = common global [32 x i8] zeroinitializer, align 1
|
||||
|
||||
declare i16* @strncat(i8*, i8*, i32)
|
||||
|
||||
define void @test_nosimplify1() {
|
||||
; CHECK: @test_nosimplify1
|
||||
; CHECK: call i16* @strncat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i16* @strncat(i8* %dst, i8* %src, i32 13)
|
||||
ret void
|
||||
}
|
||||
@ -1,33 +0,0 @@
|
||||
; Test that the StrCatOptimizer works correctly
|
||||
; PR3661
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: not grep "call.*strcat"
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: grep "puts.*%arg1"
|
||||
|
||||
; This transformation requires the pointer size, as it assumes that size_t is
|
||||
; the size of a pointer.
|
||||
target datalayout = "-p:64:64:64"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1]
|
||||
@null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1]
|
||||
@null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1]
|
||||
|
||||
declare i8* @strcat(i8*, i8*)
|
||||
|
||||
declare i32 @puts(i8*)
|
||||
|
||||
define i32 @main() {
|
||||
%target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2]
|
||||
store i8 0, i8* %arg1
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt1 = call i8* @strcat( i8* %arg1, i8* %arg2 ) ; <i8*> [#uses=1]
|
||||
%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt2 = call i8* @strcat( i8* %rslt1, i8* %arg3 ) ; <i8*> [#uses=1]
|
||||
%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt3 = call i8* @strcat( i8* %rslt2, i8* %arg4 ) ; <i8*> [#uses=1]
|
||||
call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0]
|
||||
ret i32 0
|
||||
}
|
||||
|
||||
@ -1,31 +0,0 @@
|
||||
; Test that the StrNCatOptimizer works correctly
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: not grep "call.*strncat"
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: grep "puts.*%arg1"
|
||||
|
||||
; This transformation requires the pointer size, as it assumes that size_t is
|
||||
; the size of a pointer.
|
||||
target datalayout = "-p:64:64:64"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1]
|
||||
@null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1]
|
||||
@null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1]
|
||||
|
||||
declare i8* @strncat(i8*, i8*, i32)
|
||||
|
||||
declare i32 @puts(i8*)
|
||||
|
||||
define i32 @main() {
|
||||
%target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2]
|
||||
store i8 0, i8* %arg1
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt1 = call i8* @strncat( i8* %arg1, i8* %arg2, i32 6 ) ; <i8*> [#uses=1]
|
||||
%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt2 = call i8* @strncat( i8* %rslt1, i8* %arg3, i32 42 ) ; <i8*> [#uses=1]
|
||||
%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt3 = call i8* @strncat( i8* %rslt2, i8* %arg4, i32 42 ) ; <i8*> [#uses=1]
|
||||
call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0]
|
||||
ret i32 0
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user