[Fixed Point Arithmetic] Add APFixedPoint to APValue
This adds APFixedPoint to the union of values that can be represented with an APValue.
Differential Revision: https://reviews.llvm.org/D56746
llvm-svn: 351368
diff --git a/clang/lib/Basic/FixedPoint.cpp b/clang/lib/Basic/FixedPoint.cpp
index 0aaa9af..e3cffe6 100644
--- a/clang/lib/Basic/FixedPoint.cpp
+++ b/clang/lib/Basic/FixedPoint.cpp
@@ -137,4 +137,31 @@
ResultIsSaturated, ResultHasUnsignedPadding);
}
+void APFixedPoint::toString(llvm::SmallVectorImpl<char> &Str) const {
+ llvm::APSInt Val = getValue();
+ unsigned Scale = getScale();
+
+ if (Val.isSigned() && Val.isNegative() && Val != -Val) {
+ Val = -Val;
+ Str.push_back('-');
+ }
+
+ llvm::APSInt IntPart = Val >> Scale;
+
+ // Add 4 digits to hold the value after multiplying 10 (the radix)
+ unsigned Width = Val.getBitWidth() + 4;
+ llvm::APInt FractPart = Val.zextOrTrunc(Scale).zext(Width);
+ llvm::APInt FractPartMask = llvm::APInt::getAllOnesValue(Scale).zext(Width);
+ llvm::APInt RadixInt = llvm::APInt(Width, 10);
+
+ IntPart.toString(Str, /*radix=*/10);
+ Str.push_back('.');
+ do {
+ (FractPart * RadixInt)
+ .lshr(Scale)
+ .toString(Str, /*radix=*/10, Val.isSigned());
+ FractPart = (FractPart * RadixInt) & FractPartMask;
+ } while (FractPart != 0);
+}
+
} // namespace clang