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Teach SimplifyLibCalls about stpcpy.

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llvm-svn: 156815
This commit is contained in:
David Majnemer 2012-05-15 11:46:21 +00:00
parent 18c55548e9
commit ea3e1ea334
2 changed files with 97 additions and 7 deletions
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61
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@ -458,6 +458,50 @@ struct StrCpyOpt : public LibCallOptimization {
}
};
//===---------------------------------------===//
// 'stpcpy' Optimizations
struct StpCpyOpt: public LibCallOptimization {
bool OptChkCall; // True if it's optimizing a __stpcpy_chk libcall.
StpCpyOpt(bool c) : OptChkCall(c) {}
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
// Verify the "stpcpy" function prototype.
unsigned NumParams = OptChkCall ? 3 : 2;
FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != NumParams ||
FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
FT->getParamType(0) != B.getInt8PtrTy())
return 0;
// These optimizations require TargetData.
if (!TD) return 0;
Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
if (Dst == Src) // stpcpy(x,x) -> x+strlen(x)
return B.CreateInBoundsGEP(Dst, EmitStrLen(Src, B, TD));
// See if we can get the length of the input string.
uint64_t Len = GetStringLength(Src);
if (Len == 0) return 0;
Value *LenV = ConstantInt::get(TD->getIntPtrType(*Context), Len);
Value *DstEnd = B.CreateGEP(Dst,
ConstantInt::get(TD->getIntPtrType(*Context),
Len - 1));
// We have enough information to now generate the memcpy call to do the
// copy for us. Make a memcpy to copy the nul byte with align = 1.
if (OptChkCall)
EmitMemCpyChk(Dst, Src, LenV, CI->getArgOperand(2), B, TD);
else
B.CreateMemCpy(Dst, Src, LenV, 1);
return DstEnd;
}
};
//===---------------------------------------===//
// 'strncpy' Optimizations
@ -1474,8 +1518,11 @@ namespace {
StringMap<LibCallOptimization*> Optimizations;
// String and Memory LibCall Optimizations
StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrRChrOpt StrRChr;
StrCmpOpt StrCmp; StrNCmpOpt StrNCmp; StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
StrNCpyOpt StrNCpy; StrLenOpt StrLen; StrPBrkOpt StrPBrk;
StrCmpOpt StrCmp; StrNCmpOpt StrNCmp;
StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
StpCpyOpt StpCpy; StpCpyOpt StpCpyChk;
StrNCpyOpt StrNCpy;
StrLenOpt StrLen; StrPBrkOpt StrPBrk;
StrToOpt StrTo; StrSpnOpt StrSpn; StrCSpnOpt StrCSpn; StrStrOpt StrStr;
MemCmpOpt MemCmp; MemCpyOpt MemCpy; MemMoveOpt MemMove; MemSetOpt MemSet;
// Math Library Optimizations
@ -1491,7 +1538,8 @@ namespace {
bool Modified; // This is only used by doInitialization.
public:
static char ID; // Pass identification
SimplifyLibCalls() : FunctionPass(ID), StrCpy(false), StrCpyChk(true) {
SimplifyLibCalls() : FunctionPass(ID), StrCpy(false), StrCpyChk(true),
StpCpy(false), StpCpyChk(true) {
initializeSimplifyLibCallsPass(*PassRegistry::getPassRegistry());
}
void AddOpt(LibFunc::Func F, LibCallOptimization* Opt);
@ -1542,6 +1590,7 @@ void SimplifyLibCalls::InitOptimizations() {
Optimizations["strncmp"] = &StrNCmp;
Optimizations["strcpy"] = &StrCpy;
Optimizations["strncpy"] = &StrNCpy;
Optimizations["stpcpy"] = &StpCpy;
Optimizations["strlen"] = &StrLen;
Optimizations["strpbrk"] = &StrPBrk;
Optimizations["strtol"] = &StrTo;
@ -1561,6 +1610,7 @@ void SimplifyLibCalls::InitOptimizations() {
// _chk variants of String and Memory LibCall Optimizations.
Optimizations["__strcpy_chk"] = &StrCpyChk;
Optimizations["__stpcpy_chk"] = &StpCpyChk;
// Math Library Optimizations
Optimizations["cosf"] = &Cos;
@ -1746,6 +1796,7 @@ void SimplifyLibCalls::inferPrototypeAttributes(Function &F) {
Name == "strtold" ||
Name == "strncat" ||
Name == "strncpy" ||
Name == "stpncpy" ||
Name == "strtoull") {
if (FTy->getNumParams() < 2 ||
!FTy->getParamType(1)->isPointerTy())
@ -2406,10 +2457,6 @@ bool SimplifyLibCalls::doInitialization(Module &M) {
// * sqrt(Nroot(x)) -> pow(x,1/(2*N))
// * sqrt(pow(x,y)) -> pow(|x|,y*0.5)
//
// stpcpy:
// * stpcpy(str, "literal") ->
// llvm.memcpy(str,"literal",strlen("literal")+1,1)
//
// strchr:
// * strchr(p, 0) -> strlen(p)
// tan, tanf, tanl:

43
test/Transforms/SimplifyLibCalls/StpCpy.ll Normal file
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@ -0,0 +1,43 @@
; Test that the StpCpyOptimizer works correctly
; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
; This transformation requires the pointer size, as it assumes that size_t is
; the size of a pointer.
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-n8:16:32"
@hello = constant [6 x i8] c"hello\00"
declare i8* @stpcpy(i8*, i8*)
declare i8* @__stpcpy_chk(i8*, i8*, i32) nounwind
declare i32 @llvm.objectsize.i32(i8*, i1, i32) nounwind readonly
define i32 @t1() {
; CHECK: @t1
%target = alloca [1024 x i8]
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
%rslt1 = call i8* @stpcpy( i8* %arg1, i8* %arg2 )
; CHECK: @llvm.memcpy.p0i8.p0i8.i32
ret i32 0
}
define i32 @t2() {
; CHECK: @t2
%target = alloca [1024 x i8]
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
%tmp1 = call i32 @llvm.objectsize.i32(i8* %arg1, i1 false, i32 0)
%rslt1 = call i8* @__stpcpy_chk(i8* %arg1, i8* %arg2, i32 %tmp1)
; CHECK: @__memcpy_chk
ret i32 0
}
define i8* @t3(i8* %arg) {
; CHECK: @t3
%stpcpy = tail call i8* @stpcpy(i8* %arg, i8* %arg)
; CHECK: [[LEN:%[a-z]+]] = call i32 @strlen(i8* %arg)
; CHECK-NEXT: getelementptr inbounds i8* %arg, i32 [[LEN]]
ret i8* %stpcpy
}