#define DEBUG_TYPE "simplify-libcalls"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/BuildLibCalls.h"
-#include "llvm/IRBuilder.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
-#include "llvm/Pass.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Config/config.h" // FIXME: Shouldn't depend on host!
+#include "llvm/DataLayout.h"
+#include "llvm/IRBuilder.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/DataLayout.h"
#include "llvm/Target/TargetLibraryInfo.h"
-#include "llvm/Config/config.h" // FIXME: Shouldn't depend on host!
+#include "llvm/Transforms/Utils/BuildLibCalls.h"
using namespace llvm;
-STATISTIC(NumSimplified, "Number of library calls simplified");
STATISTIC(NumAnnotated, "Number of attributes added to library functions");
//===----------------------------------------------------------------------===//
} // End anonymous namespace.
-//===----------------------------------------------------------------------===//
-// Helper Functions
-//===----------------------------------------------------------------------===//
-
-static bool CallHasFloatingPointArgument(const CallInst *CI) {
- for (CallInst::const_op_iterator it = CI->op_begin(), e = CI->op_end();
- it != e; ++it) {
- if ((*it)->getType()->isFloatingPointTy())
- return true;
- }
- return false;
-}
-
-namespace {
-//===----------------------------------------------------------------------===//
-// Integer Optimizations
-//===----------------------------------------------------------------------===//
-
-//===---------------------------------------===//
-// 'isdigit' Optimizations
-
-struct IsDigitOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- FunctionType *FT = Callee->getFunctionType();
- // We require integer(i32)
- if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
- !FT->getParamType(0)->isIntegerTy(32))
- return 0;
-
- // isdigit(c) -> (c-'0') <u 10
- Value *Op = CI->getArgOperand(0);
- Op = B.CreateSub(Op, B.getInt32('0'), "isdigittmp");
- Op = B.CreateICmpULT(Op, B.getInt32(10), "isdigit");
- return B.CreateZExt(Op, CI->getType());
- }
-};
-
-//===---------------------------------------===//
-// 'isascii' Optimizations
-
-struct IsAsciiOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- FunctionType *FT = Callee->getFunctionType();
- // We require integer(i32)
- if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
- !FT->getParamType(0)->isIntegerTy(32))
- return 0;
-
- // isascii(c) -> c <u 128
- Value *Op = CI->getArgOperand(0);
- Op = B.CreateICmpULT(Op, B.getInt32(128), "isascii");
- return B.CreateZExt(Op, CI->getType());
- }
-};
-
-//===---------------------------------------===//
-// 'toascii' Optimizations
-
-struct ToAsciiOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- FunctionType *FT = Callee->getFunctionType();
- // We require i32(i32)
- if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
- !FT->getParamType(0)->isIntegerTy(32))
- return 0;
-
- // isascii(c) -> c & 0x7f
- return B.CreateAnd(CI->getArgOperand(0),
- ConstantInt::get(CI->getType(),0x7F));
- }
-};
-
-//===----------------------------------------------------------------------===//
-// Formatting and IO Optimizations
-//===----------------------------------------------------------------------===//
-
-//===---------------------------------------===//
-// 'printf' Optimizations
-
-struct PrintFOpt : public LibCallOptimization {
- Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
- IRBuilder<> &B) {
- // Check for a fixed format string.
- StringRef FormatStr;
- if (!getConstantStringInfo(CI->getArgOperand(0), FormatStr))
- return 0;
-
- // Empty format string -> noop.
- if (FormatStr.empty()) // Tolerate printf's declared void.
- return CI->use_empty() ? (Value*)CI :
- ConstantInt::get(CI->getType(), 0);
-
- // Do not do any of the following transformations if the printf return value
- // is used, in general the printf return value is not compatible with either
- // putchar() or puts().
- if (!CI->use_empty())
- return 0;
-
- // printf("x") -> putchar('x'), even for '%'.
- if (FormatStr.size() == 1) {
- Value *Res = EmitPutChar(B.getInt32(FormatStr[0]), B, TD, TLI);
- if (CI->use_empty() || !Res) return Res;
- return B.CreateIntCast(Res, CI->getType(), true);
- }
-
- // printf("foo\n") --> puts("foo")
- if (FormatStr[FormatStr.size()-1] == '\n' &&
- FormatStr.find('%') == std::string::npos) { // no format characters.
- // Create a string literal with no \n on it. We expect the constant merge
- // pass to be run after this pass, to merge duplicate strings.
- FormatStr = FormatStr.drop_back();
- Value *GV = B.CreateGlobalString(FormatStr, "str");
- Value *NewCI = EmitPutS(GV, B, TD, TLI);
- return (CI->use_empty() || !NewCI) ?
- NewCI :
- ConstantInt::get(CI->getType(), FormatStr.size()+1);
- }
-
- // Optimize specific format strings.
- // printf("%c", chr) --> putchar(chr)
- if (FormatStr == "%c" && CI->getNumArgOperands() > 1 &&
- CI->getArgOperand(1)->getType()->isIntegerTy()) {
- Value *Res = EmitPutChar(CI->getArgOperand(1), B, TD, TLI);
-
- if (CI->use_empty() || !Res) return Res;
- return B.CreateIntCast(Res, CI->getType(), true);
- }
-
- // printf("%s\n", str) --> puts(str)
- if (FormatStr == "%s\n" && CI->getNumArgOperands() > 1 &&
- CI->getArgOperand(1)->getType()->isPointerTy()) {
- return EmitPutS(CI->getArgOperand(1), B, TD, TLI);
- }
- return 0;
- }
-
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require one fixed pointer argument and an integer/void result.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
- !(FT->getReturnType()->isIntegerTy() ||
- FT->getReturnType()->isVoidTy()))
- return 0;
-
- if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
- return V;
- }
-
- // printf(format, ...) -> iprintf(format, ...) if no floating point
- // arguments.
- if (TLI->has(LibFunc::iprintf) && !CallHasFloatingPointArgument(CI)) {
- Module *M = B.GetInsertBlock()->getParent()->getParent();
- Constant *IPrintFFn =
- M->getOrInsertFunction("iprintf", FT, Callee->getAttributes());
- CallInst *New = cast<CallInst>(CI->clone());
- New->setCalledFunction(IPrintFFn);
- B.Insert(New);
- return New;
- }
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// 'sprintf' Optimizations
-
-struct SPrintFOpt : public LibCallOptimization {
- Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
- IRBuilder<> &B) {
- // Check for a fixed format string.
- StringRef FormatStr;
- if (!getConstantStringInfo(CI->getArgOperand(1), FormatStr))
- return 0;
-
- // If we just have a format string (nothing else crazy) transform it.
- if (CI->getNumArgOperands() == 2) {
- // Make sure there's no % in the constant array. We could try to handle
- // %% -> % in the future if we cared.
- for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
- if (FormatStr[i] == '%')
- return 0; // we found a format specifier, bail out.
-
- // These optimizations require DataLayout.
- if (!TD) return 0;
-
- // sprintf(str, fmt) -> llvm.memcpy(str, fmt, strlen(fmt)+1, 1)
- B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1),
- ConstantInt::get(TD->getIntPtrType(*Context), // Copy the
- FormatStr.size() + 1), 1); // nul byte.
- return ConstantInt::get(CI->getType(), FormatStr.size());
- }
-
- // The remaining optimizations require the format string to be "%s" or "%c"
- // and have an extra operand.
- if (FormatStr.size() != 2 || FormatStr[0] != '%' ||
- CI->getNumArgOperands() < 3)
- return 0;
-
- // Decode the second character of the format string.
- if (FormatStr[1] == 'c') {
- // sprintf(dst, "%c", chr) --> *(i8*)dst = chr; *((i8*)dst+1) = 0
- if (!CI->getArgOperand(2)->getType()->isIntegerTy()) return 0;
- Value *V = B.CreateTrunc(CI->getArgOperand(2), B.getInt8Ty(), "char");
- Value *Ptr = CastToCStr(CI->getArgOperand(0), B);
- B.CreateStore(V, Ptr);
- Ptr = B.CreateGEP(Ptr, B.getInt32(1), "nul");
- B.CreateStore(B.getInt8(0), Ptr);
-
- return ConstantInt::get(CI->getType(), 1);
- }
-
- if (FormatStr[1] == 's') {
- // These optimizations require DataLayout.
- if (!TD) return 0;
-
- // sprintf(dest, "%s", str) -> llvm.memcpy(dest, str, strlen(str)+1, 1)
- if (!CI->getArgOperand(2)->getType()->isPointerTy()) return 0;
-
- Value *Len = EmitStrLen(CI->getArgOperand(2), B, TD, TLI);
- if (!Len)
- return 0;
- Value *IncLen = B.CreateAdd(Len,
- ConstantInt::get(Len->getType(), 1),
- "leninc");
- B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(2), IncLen, 1);
-
- // The sprintf result is the unincremented number of bytes in the string.
- return B.CreateIntCast(Len, CI->getType(), false);
- }
- return 0;
- }
-
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require two fixed pointer arguments and an integer result.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isPointerTy() ||
- !FT->getReturnType()->isIntegerTy())
- return 0;
-
- if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
- return V;
- }
-
- // sprintf(str, format, ...) -> siprintf(str, format, ...) if no floating
- // point arguments.
- if (TLI->has(LibFunc::siprintf) && !CallHasFloatingPointArgument(CI)) {
- Module *M = B.GetInsertBlock()->getParent()->getParent();
- Constant *SIPrintFFn =
- M->getOrInsertFunction("siprintf", FT, Callee->getAttributes());
- CallInst *New = cast<CallInst>(CI->clone());
- New->setCalledFunction(SIPrintFFn);
- B.Insert(New);
- return New;
- }
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// 'fwrite' Optimizations
-
-struct FWriteOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require a pointer, an integer, an integer, a pointer, returning integer.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 4 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isIntegerTy() ||
- !FT->getParamType(2)->isIntegerTy() ||
- !FT->getParamType(3)->isPointerTy() ||
- !FT->getReturnType()->isIntegerTy())
- return 0;
-
- // Get the element size and count.
- ConstantInt *SizeC = dyn_cast<ConstantInt>(CI->getArgOperand(1));
- ConstantInt *CountC = dyn_cast<ConstantInt>(CI->getArgOperand(2));
- if (!SizeC || !CountC) return 0;
- uint64_t Bytes = SizeC->getZExtValue()*CountC->getZExtValue();
-
- // If this is writing zero records, remove the call (it's a noop).
- if (Bytes == 0)
- return ConstantInt::get(CI->getType(), 0);
-
- // If this is writing one byte, turn it into fputc.
- // This optimisation is only valid, if the return value is unused.
- if (Bytes == 1 && CI->use_empty()) { // fwrite(S,1,1,F) -> fputc(S[0],F)
- Value *Char = B.CreateLoad(CastToCStr(CI->getArgOperand(0), B), "char");
- Value *NewCI = EmitFPutC(Char, CI->getArgOperand(3), B, TD, TLI);
- return NewCI ? ConstantInt::get(CI->getType(), 1) : 0;
- }
-
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// 'fputs' Optimizations
-
-struct FPutsOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require DataLayout.
- if (!TD) return 0;
-
- // Require two pointers. Also, we can't optimize if return value is used.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isPointerTy() ||
- !CI->use_empty())
- return 0;
-
- // fputs(s,F) --> fwrite(s,1,strlen(s),F)
- uint64_t Len = GetStringLength(CI->getArgOperand(0));
- if (!Len) return 0;
- // Known to have no uses (see above).
- return EmitFWrite(CI->getArgOperand(0),
- ConstantInt::get(TD->getIntPtrType(*Context), Len-1),
- CI->getArgOperand(1), B, TD, TLI);
- }
-};
-
-//===---------------------------------------===//
-// 'fprintf' Optimizations
-
-struct FPrintFOpt : public LibCallOptimization {
- Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
- IRBuilder<> &B) {
- // All the optimizations depend on the format string.
- StringRef FormatStr;
- if (!getConstantStringInfo(CI->getArgOperand(1), FormatStr))
- return 0;
-
- // fprintf(F, "foo") --> fwrite("foo", 3, 1, F)
- if (CI->getNumArgOperands() == 2) {
- for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
- if (FormatStr[i] == '%') // Could handle %% -> % if we cared.
- return 0; // We found a format specifier.
-
- // These optimizations require DataLayout.
- if (!TD) return 0;
-
- Value *NewCI = EmitFWrite(CI->getArgOperand(1),
- ConstantInt::get(TD->getIntPtrType(*Context),
- FormatStr.size()),
- CI->getArgOperand(0), B, TD, TLI);
- return NewCI ? ConstantInt::get(CI->getType(), FormatStr.size()) : 0;
- }
-
- // The remaining optimizations require the format string to be "%s" or "%c"
- // and have an extra operand.
- if (FormatStr.size() != 2 || FormatStr[0] != '%' ||
- CI->getNumArgOperands() < 3)
- return 0;
-
- // Decode the second character of the format string.
- if (FormatStr[1] == 'c') {
- // fprintf(F, "%c", chr) --> fputc(chr, F)
- if (!CI->getArgOperand(2)->getType()->isIntegerTy()) return 0;
- Value *NewCI = EmitFPutC(CI->getArgOperand(2), CI->getArgOperand(0), B,
- TD, TLI);
- return NewCI ? ConstantInt::get(CI->getType(), 1) : 0;
- }
-
- if (FormatStr[1] == 's') {
- // fprintf(F, "%s", str) --> fputs(str, F)
- if (!CI->getArgOperand(2)->getType()->isPointerTy() || !CI->use_empty())
- return 0;
- return EmitFPutS(CI->getArgOperand(2), CI->getArgOperand(0), B, TD, TLI);
- }
- return 0;
- }
-
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require two fixed paramters as pointers and integer result.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isPointerTy() ||
- !FT->getReturnType()->isIntegerTy())
- return 0;
-
- if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
- return V;
- }
-
- // fprintf(stream, format, ...) -> fiprintf(stream, format, ...) if no
- // floating point arguments.
- if (TLI->has(LibFunc::fiprintf) && !CallHasFloatingPointArgument(CI)) {
- Module *M = B.GetInsertBlock()->getParent()->getParent();
- Constant *FIPrintFFn =
- M->getOrInsertFunction("fiprintf", FT, Callee->getAttributes());
- CallInst *New = cast<CallInst>(CI->clone());
- New->setCalledFunction(FIPrintFFn);
- B.Insert(New);
- return New;
- }
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// 'puts' Optimizations
-
-struct PutsOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require one fixed pointer argument and an integer/void result.
- FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
- !(FT->getReturnType()->isIntegerTy() ||
- FT->getReturnType()->isVoidTy()))
- return 0;
-
- // Check for a constant string.
- StringRef Str;
- if (!getConstantStringInfo(CI->getArgOperand(0), Str))
- return 0;
-
- if (Str.empty() && CI->use_empty()) {
- // puts("") -> putchar('\n')
- Value *Res = EmitPutChar(B.getInt32('\n'), B, TD, TLI);
- if (CI->use_empty() || !Res) return Res;
- return B.CreateIntCast(Res, CI->getType(), true);
- }
-
- return 0;
- }
-};
-
-} // end anonymous namespace.
-
//===----------------------------------------------------------------------===//
// SimplifyLibCalls Pass Implementation
//===----------------------------------------------------------------------===//
TargetLibraryInfo *TLI;
StringMap<LibCallOptimization*> Optimizations;
- // Integer Optimizations
- IsDigitOpt IsDigit; IsAsciiOpt IsAscii;
- ToAsciiOpt ToAscii;
- // Formatting and IO Optimizations
- SPrintFOpt SPrintF; PrintFOpt PrintF;
- FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
- PutsOpt Puts;
bool Modified; // This is only used by doInitialization.
public:
/// Optimizations - Populate the Optimizations map with all the optimizations
/// we know.
void SimplifyLibCalls::InitOptimizations() {
- // Integer Optimizations
- Optimizations["isdigit"] = &IsDigit;
- Optimizations["isascii"] = &IsAscii;
- Optimizations["toascii"] = &ToAscii;
-
- // Formatting and IO Optimizations
- Optimizations["sprintf"] = &SPrintF;
- Optimizations["printf"] = &PrintF;
- AddOpt(LibFunc::fwrite, &FWrite);
- AddOpt(LibFunc::fputs, &FPuts);
- Optimizations["fprintf"] = &FPrintF;
- Optimizations["puts"] = &Puts;
}
// Something changed!
Changed = true;
- ++NumSimplified;
// Inspect the instruction after the call (which was potentially just
// added) next.
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