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Add a few float shrinking optimizations to SimplifyLibCalls. Unsafe
optimizations are guarded by the -enable-double-float-shrink LLVM option. Last bit of PR13574. Patch by Weiming Zhao <weimingz@codeaurora.org>. llvm-svn: 162368
This commit is contained in:
Chad Rosier
parent
a00a3562bd
commit
1065b2523b
@ -28,6 +28,7 @@
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetData.h"
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@ -38,6 +39,10 @@ using namespace llvm;
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STATISTIC(NumSimplified, "Number of library calls simplified");
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STATISTIC(NumAnnotated, "Number of attributes added to library functions");
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static cl::opt<bool> UnsafeFPShrink("enable-double-float-shrink", cl::Hidden,
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cl::init(false),
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cl::desc("Enable unsafe double to float "
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"shrinking for math lib calls"));
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//===----------------------------------------------------------------------===//
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// Optimizer Base Class
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//===----------------------------------------------------------------------===//
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@ -893,16 +898,56 @@ struct MemSetOpt : public LibCallOptimization {
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//===----------------------------------------------------------------------===//
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//===---------------------------------------===//
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// 'cos*' Optimizations
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// Double -> Float Shrinking Optimizations for Unary Functions like 'floor'
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struct UnaryDoubleFPOpt : public LibCallOptimization {
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bool CheckRetType;
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UnaryDoubleFPOpt(bool CheckReturnType): CheckRetType(CheckReturnType) {}
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 1 || !FT->getReturnType()->isDoubleTy() ||
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!FT->getParamType(0)->isDoubleTy())
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return 0;
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if (CheckRetType) {
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// Check if all the uses for function like 'sin' are converted to float.
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for (Value::use_iterator UseI = CI->use_begin(); UseI != CI->use_end();
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++UseI) {
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FPTruncInst *Cast = dyn_cast<FPTruncInst>(*UseI);
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if (Cast == 0 || !Cast->getType()->isFloatTy())
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return 0;
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}
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}
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// If this is something like 'floor((double)floatval)', convert to floorf.
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FPExtInst *Cast = dyn_cast<FPExtInst>(CI->getArgOperand(0));
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if (Cast == 0 || !Cast->getOperand(0)->getType()->isFloatTy())
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return 0;
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// floor((double)floatval) -> (double)floorf(floatval)
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Value *V = Cast->getOperand(0);
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V = EmitUnaryFloatFnCall(V, Callee->getName(), B, Callee->getAttributes());
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return B.CreateFPExt(V, B.getDoubleTy());
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}
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};
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//===---------------------------------------===//
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// 'cos*' Optimizations
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struct CosOpt : public LibCallOptimization {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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Value *Ret = NULL;
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if (UnsafeFPShrink && Callee->getName() == "cos" &&
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TLI->has(LibFunc::cosf)) {
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UnaryDoubleFPOpt UnsafeUnaryDoubleFP(true);
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Ret = UnsafeUnaryDoubleFP.CallOptimizer(Callee, CI, B);
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}
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FunctionType *FT = Callee->getFunctionType();
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// Just make sure this has 1 argument of FP type, which matches the
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// result type.
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if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
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!FT->getParamType(0)->isFloatingPointTy())
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return 0;
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return Ret;
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// cos(-x) -> cos(x)
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Value *Op1 = CI->getArgOperand(0);
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@ -910,7 +955,7 @@ struct CosOpt : public LibCallOptimization {
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BinaryOperator *BinExpr = cast<BinaryOperator>(Op1);
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return B.CreateCall(Callee, BinExpr->getOperand(1), "cos");
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}
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return 0;
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return Ret;
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}
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};
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@ -919,13 +964,20 @@ struct CosOpt : public LibCallOptimization {
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struct PowOpt : public LibCallOptimization {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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Value *Ret = NULL;
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if (UnsafeFPShrink && Callee->getName() == "pow" &&
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TLI->has(LibFunc::powf)) {
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UnaryDoubleFPOpt UnsafeUnaryDoubleFP(true);
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Ret = UnsafeUnaryDoubleFP.CallOptimizer(Callee, CI, B);
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}
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FunctionType *FT = Callee->getFunctionType();
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// Just make sure this has 2 arguments of the same FP type, which match the
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// result type.
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if (FT->getNumParams() != 2 || FT->getReturnType() != FT->getParamType(0) ||
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FT->getParamType(0) != FT->getParamType(1) ||
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!FT->getParamType(0)->isFloatingPointTy())
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return 0;
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return Ret;
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Value *Op1 = CI->getArgOperand(0), *Op2 = CI->getArgOperand(1);
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if (ConstantFP *Op1C = dyn_cast<ConstantFP>(Op1)) {
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@ -936,7 +988,7 @@ struct PowOpt : public LibCallOptimization {
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}
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ConstantFP *Op2C = dyn_cast<ConstantFP>(Op2);
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if (Op2C == 0) return 0;
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if (Op2C == 0) return Ret;
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if (Op2C->getValueAPF().isZero()) // pow(x, 0.0) -> 1.0
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return ConstantFP::get(CI->getType(), 1.0);
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@ -974,12 +1026,19 @@ struct PowOpt : public LibCallOptimization {
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struct Exp2Opt : public LibCallOptimization {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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Value *Ret = NULL;
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if (UnsafeFPShrink && Callee->getName() == "exp2" &&
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TLI->has(LibFunc::exp2)) {
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UnaryDoubleFPOpt UnsafeUnaryDoubleFP(true);
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Ret = UnsafeUnaryDoubleFP.CallOptimizer(Callee, CI, B);
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}
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FunctionType *FT = Callee->getFunctionType();
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// Just make sure this has 1 argument of FP type, which matches the
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// result type.
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if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
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!FT->getParamType(0)->isFloatingPointTy())
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return 0;
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return Ret;
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Value *Op = CI->getArgOperand(0);
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// Turn exp2(sitofp(x)) -> ldexp(1.0, sext(x)) if sizeof(x) <= 32
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@ -1016,29 +1075,7 @@ struct Exp2Opt : public LibCallOptimization {
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return CI;
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}
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return 0;
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}
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};
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//===---------------------------------------===//
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// Double -> Float Shrinking Optimizations for Unary Functions like 'floor'
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struct UnaryDoubleFPOpt : public LibCallOptimization {
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virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
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FunctionType *FT = Callee->getFunctionType();
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if (FT->getNumParams() != 1 || !FT->getReturnType()->isDoubleTy() ||
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!FT->getParamType(0)->isDoubleTy())
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return 0;
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// If this is something like 'floor((double)floatval)', convert to floorf.
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FPExtInst *Cast = dyn_cast<FPExtInst>(CI->getArgOperand(0));
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if (Cast == 0 || !Cast->getOperand(0)->getType()->isFloatTy())
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return 0;
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// floor((double)floatval) -> (double)floorf(floatval)
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Value *V = Cast->getOperand(0);
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V = EmitUnaryFloatFnCall(V, Callee->getName(), B, Callee->getAttributes());
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return B.CreateFPExt(V, B.getDoubleTy());
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return Ret;
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}
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};
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@ -1534,7 +1571,8 @@ namespace {
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StrToOpt StrTo; StrSpnOpt StrSpn; StrCSpnOpt StrCSpn; StrStrOpt StrStr;
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MemCmpOpt MemCmp; MemCpyOpt MemCpy; MemMoveOpt MemMove; MemSetOpt MemSet;
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// Math Library Optimizations
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CosOpt Cos; PowOpt Pow; Exp2Opt Exp2; UnaryDoubleFPOpt UnaryDoubleFP;
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CosOpt Cos; PowOpt Pow; Exp2Opt Exp2;
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UnaryDoubleFPOpt UnaryDoubleFP, UnsafeUnaryDoubleFP;
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// Integer Optimizations
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FFSOpt FFS; AbsOpt Abs; IsDigitOpt IsDigit; IsAsciiOpt IsAscii;
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ToAsciiOpt ToAscii;
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@ -1547,7 +1585,8 @@ namespace {
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public:
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static char ID; // Pass identification
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SimplifyLibCalls() : FunctionPass(ID), StrCpy(false), StrCpyChk(true),
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StpCpy(false), StpCpyChk(true) {
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StpCpy(false), StpCpyChk(true),
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UnaryDoubleFP(false), UnsafeUnaryDoubleFP(true) {
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initializeSimplifyLibCallsPass(*PassRegistry::getPassRegistry());
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}
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void AddOpt(LibFunc::Func F, LibCallOptimization* Opt);
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@ -1651,11 +1690,35 @@ void SimplifyLibCalls::InitOptimizations() {
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AddOpt(LibFunc::ceil, LibFunc::ceilf, &UnaryDoubleFP);
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AddOpt(LibFunc::fabs, LibFunc::fabsf, &UnaryDoubleFP);
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AddOpt(LibFunc::floor, LibFunc::floorf, &UnaryDoubleFP);
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AddOpt(LibFunc::rint, LibFunc::rintf, &UnaryDoubleFP);
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AddOpt(LibFunc::round, LibFunc::roundf, &UnaryDoubleFP);
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AddOpt(LibFunc::nearbyint, LibFunc::nearbyintf, &UnaryDoubleFP);
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AddOpt(LibFunc::trunc, LibFunc::truncf, &UnaryDoubleFP);
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AddOpt(LibFunc::floor, LibFunc::floorf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::rint, LibFunc::rintf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::round, LibFunc::roundf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::nearbyint, LibFunc::nearbyintf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::trunc, LibFunc::truncf, &UnsafeUnaryDoubleFP);
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if(UnsafeFPShrink) {
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AddOpt(LibFunc::acos, LibFunc::acosf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::acosh, LibFunc::acoshf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::asin, LibFunc::asinf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::asinh, LibFunc::asinhf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::atan, LibFunc::atanf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::atanh, LibFunc::atanhf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::cbrt, LibFunc::cbrtf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::cosh, LibFunc::coshf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::exp, LibFunc::expf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::exp10, LibFunc::exp10f, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::expm1, LibFunc::expm1f, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::log, LibFunc::logf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::log10, LibFunc::log10f, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::log1p, LibFunc::log1pf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::log2, LibFunc::log2f, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::logb, LibFunc::logbf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::sin, LibFunc::sinf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::sinh, LibFunc::sinhf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::sqrt, LibFunc::sqrtf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::tan, LibFunc::tanf, &UnsafeUnaryDoubleFP);
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AddOpt(LibFunc::tanh, LibFunc::tanhf, &UnsafeUnaryDoubleFP);
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}
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// Integer Optimizations
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Optimizations["ffs"] = &FFS;
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