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[ConstantFolding] Refactor math functions to use LLVM ones (NFC)

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When possible, replace calls to library routines on the host with equivalent
ones in LLVM.

Differential revision: https://reviews.llvm.org/D67459

llvm-svn: 371677
This commit is contained in:
Evandro Menezes 2019-09-11 21:46:57 +00:00
parent c58a95b452
commit b12327bff7
1 changed files with 43 additions and 38 deletions
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81
lib/Analysis/ConstantFolding.cpp
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@ -1718,40 +1718,37 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy())
return nullptr;
if (IntrinsicID == Intrinsic::round) {
APFloat V = Op->getValueAPF();
V.roundToIntegral(APFloat::rmNearestTiesToAway);
return ConstantFP::get(Ty->getContext(), V);
// Use internal versions of these intrinsics.
APFloat U = Op->getValueAPF();
if (IntrinsicID == Intrinsic::nearbyint || IntrinsicID == Intrinsic::rint) {
U.roundToIntegral(APFloat::rmNearestTiesToEven);
return ConstantFP::get(Ty->getContext(), U);
}
if (IntrinsicID == Intrinsic::floor) {
APFloat V = Op->getValueAPF();
V.roundToIntegral(APFloat::rmTowardNegative);
return ConstantFP::get(Ty->getContext(), V);
if (IntrinsicID == Intrinsic::round) {
U.roundToIntegral(APFloat::rmNearestTiesToAway);
return ConstantFP::get(Ty->getContext(), U);
}
if (IntrinsicID == Intrinsic::ceil) {
APFloat V = Op->getValueAPF();
V.roundToIntegral(APFloat::rmTowardPositive);
return ConstantFP::get(Ty->getContext(), V);
U.roundToIntegral(APFloat::rmTowardPositive);
return ConstantFP::get(Ty->getContext(), U);
}
if (IntrinsicID == Intrinsic::floor) {
U.roundToIntegral(APFloat::rmTowardNegative);
return ConstantFP::get(Ty->getContext(), U);
}
if (IntrinsicID == Intrinsic::trunc) {
APFloat V = Op->getValueAPF();
V.roundToIntegral(APFloat::rmTowardZero);
return ConstantFP::get(Ty->getContext(), V);
U.roundToIntegral(APFloat::rmTowardZero);
return ConstantFP::get(Ty->getContext(), U);
}
if (IntrinsicID == Intrinsic::rint) {
APFloat V = Op->getValueAPF();
V.roundToIntegral(APFloat::rmNearestTiesToEven);
return ConstantFP::get(Ty->getContext(), V);
}
if (IntrinsicID == Intrinsic::nearbyint) {
APFloat V = Op->getValueAPF();
V.roundToIntegral(APFloat::rmNearestTiesToEven);
return ConstantFP::get(Ty->getContext(), V);
if (IntrinsicID == Intrinsic::fabs) {
U.clearSign();
return ConstantFP::get(Ty->getContext(), U);
}
/// We only fold functions with finite arguments. Folding NaN and inf is
@ -1768,8 +1765,6 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
switch (IntrinsicID) {
default: break;
case Intrinsic::fabs:
return ConstantFoldFP(fabs, V, Ty);
case Intrinsic::log:
return ConstantFoldFP(log, V, Ty);
case Intrinsic::log2:
@ -1796,7 +1791,6 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
LibFunc Func = NotLibFunc;
TLI->getLibFunc(Name, Func);
switch (Func) {
default:
break;
@ -1821,8 +1815,10 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
break;
case LibFunc_ceil:
case LibFunc_ceilf:
if (TLI->has(Func))
return ConstantFoldFP(ceil, V, Ty);
if (TLI->has(Func)) {
U.roundToIntegral(APFloat::rmTowardPositive);
return ConstantFP::get(Ty->getContext(), U);
}
break;
case LibFunc_cos:
case LibFunc_cosf:
@ -1853,16 +1849,21 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
break;
case LibFunc_fabs:
case LibFunc_fabsf:
if (TLI->has(Func))
return ConstantFoldFP(fabs, V, Ty);
if (TLI->has(Func)) {
U.clearSign();
return ConstantFP::get(Ty->getContext(), U);
}
break;
case LibFunc_floor:
case LibFunc_floorf:
if (TLI->has(Func))
return ConstantFoldFP(floor, V, Ty);
if (TLI->has(Func)) {
U.roundToIntegral(APFloat::rmTowardNegative);
return ConstantFP::get(Ty->getContext(), U);
}
break;
case LibFunc_log:
case LibFunc_logf:
case LibFunc_log_finite:
case LibFunc_logf_finite:
if (V > 0.0 && TLI->has(Func))
@ -1878,8 +1879,10 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
break;
case LibFunc_round:
case LibFunc_roundf:
if (TLI->has(Func))
return ConstantFoldFP(round, V, Ty);
if (TLI->has(Func)) {
U.roundToIntegral(APFloat::rmNearestTiesToAway);
return ConstantFP::get(Ty->getContext(), U);
}
break;
case LibFunc_sin:
case LibFunc_sinf:
@ -2040,9 +2043,11 @@ static Constant *ConstantFoldScalarCall2(StringRef Name,
break;
case LibFunc_fmod:
case LibFunc_fmodf:
if (TLI->has(Func))
// TODO: What about hosts that lack a C99 library?
return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty);
if (TLI->has(Func)) {
APFloat V = Op1->getValueAPF();
if (APFloat::opStatus::opOK == V.mod(Op2->getValueAPF()))
return ConstantFP::get(Ty->getContext(), V);
}
break;
case LibFunc_atan2:
case LibFunc_atan2f: