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The powers that be have decided that LLVM IR should now support 16-bit

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"half precision" floating-point with a first-class type.

This patch adds basic IR support (but not codegen support).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146786 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2011-12-17 00:04:22 +00:00
parent 2e1b0c0cd9
commit ce16339930
18 changed files with 123 additions and 56 deletions
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lib/AsmParser/LLParser.cpp
+9 -6
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@@ -2483,13 +2483,16 @@ bool LLParser::ConvertValIDToValue(Type *Ty, ValID &ID, Value *&V,
!ConstantFP::isValueValidForType(Ty, ID.APFloatVal))
return Error(ID.Loc, "floating point constant invalid for type");
// The lexer has no type info, so builds all float and double FP constants
// as double. Fix this here. Long double does not need this.
if (&ID.APFloatVal.getSemantics() == &APFloat::IEEEdouble &&
Ty->isFloatTy()) {
// The lexer has no type info, so builds all half, float, and double FP
// constants as double. Fix this here. Long double does not need this.
if (&ID.APFloatVal.getSemantics() == &APFloat::IEEEdouble) {
bool Ignored;
ID.APFloatVal.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven,
&Ignored);
if (Ty->isHalfTy())
ID.APFloatVal.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven,
&Ignored);
else if (Ty->isFloatTy())
ID.APFloatVal.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven,
&Ignored);
}
V = ConstantFP::get(Context, ID.APFloatVal);