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[ConstantFolding] Refactor functions not available before C99 (NFC) 

Note the cases when calling a function at compile time may fail if the host
does not support the C99 run time library.

llvm-svn: 371236
This commit is contained in:
Evandro Menezes 2019-09-06 18:24:21 +00:00
parent fab40fce3f
commit 7feb812ccd
1 changed files with 6 additions and 1 deletions
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7
llvm/lib/Analysis/ConstantFolding.cpp
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@ -1773,13 +1773,16 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
case Intrinsic::log:
return ConstantFoldFP(log, V, Ty);
case Intrinsic::log2:
// TODO: What about hosts that lack a C99 library?
return ConstantFoldFP(Log2, V, Ty);
case Intrinsic::log10:
// TODO: What about hosts that lack a C99 library?
return ConstantFoldFP(log10, V, Ty);
case Intrinsic::exp:
return ConstantFoldFP(exp, V, Ty);
case Intrinsic::exp2:
return ConstantFoldFP(exp2, V, Ty);
// Fold exp2(x) as pow(2, x), in case the host lacks a C99 library.
return ConstantFoldBinaryFP(pow, 2.0, V, Ty);
case Intrinsic::sin:
return ConstantFoldFP(sin, V, Ty);
case Intrinsic::cos:
@ -1870,6 +1873,7 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
case LibFunc_log10_finite:
case LibFunc_log10f_finite:
if (V > 0.0 && TLI->has(Func))
// TODO: What about hosts that lack a C99 library?
return ConstantFoldFP(log10, V, Ty);
break;
case LibFunc_round:
@ -2037,6 +2041,7 @@ static Constant *ConstantFoldScalarCall2(StringRef Name,
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);
break;
case LibFunc_atan2: