[Fixed Point Arithmetic] Fixed Point and Integer Conversions
This patch includes the necessary code for converting between a fixed point type and integer.
This also includes constant expression evaluation for conversions with these types.
Differential Revision: https://reviews.llvm.org/D56900
llvm-svn: 355462
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 44ccb74..1a21ad25 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -9776,6 +9776,7 @@
case CK_AddressSpaceConversion:
case CK_IntToOCLSampler:
case CK_FixedPointCast:
+ case CK_IntegralToFixedPoint:
llvm_unreachable("invalid cast kind for integral value");
case CK_BitCast:
@@ -9810,6 +9811,19 @@
return Success(IntResult, E);
}
+ case CK_FixedPointToIntegral: {
+ APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SrcType));
+ if (!EvaluateFixedPoint(SubExpr, Src, Info))
+ return false;
+ bool Overflowed;
+ llvm::APSInt Result = Src.convertToInt(
+ Info.Ctx.getIntWidth(DestType),
+ DestType->isSignedIntegerOrEnumerationType(), &Overflowed);
+ if (Overflowed && !HandleOverflow(Info, E, Result, DestType))
+ return false;
+ return Success(Result, E);
+ }
+
case CK_FixedPointToBoolean: {
// Unsigned padding does not affect this.
APValue Val;
@@ -9970,6 +9984,20 @@
return false;
return Success(Result, E);
}
+ case CK_IntegralToFixedPoint: {
+ APSInt Src;
+ if (!EvaluateInteger(SubExpr, Src, Info))
+ return false;
+
+ bool Overflowed;
+ APFixedPoint IntResult = APFixedPoint::getFromIntValue(
+ Src, Info.Ctx.getFixedPointSemantics(DestType), &Overflowed);
+
+ if (Overflowed && !HandleOverflow(Info, E, IntResult, DestType))
+ return false;
+
+ return Success(IntResult, E);
+ }
case CK_NoOp:
case CK_LValueToRValue:
return ExprEvaluatorBaseTy::VisitCastExpr(E);
@@ -10371,6 +10399,8 @@
case CK_IntToOCLSampler:
case CK_FixedPointCast:
case CK_FixedPointToBoolean:
+ case CK_FixedPointToIntegral:
+ case CK_IntegralToFixedPoint:
llvm_unreachable("invalid cast kind for complex value");
case CK_LValueToRValue: