search for: directed_roundings

Displaying 2 results from an estimated 2 matches for "directed_roundings".

2020 Sep 04
2
Misleading documentation on FP to integer conversion instructions?
The LLVM IR reference manual states, for fptosi: "The ‘fptosi’ instruction converts its floating-point <http://llvm.org/docs/LangRef.html#t-floating> operand into the nearest (rounding towards zero) signed integer value." I interpreted this to mean that it rounds: The nearest integer to 0.3 is 0. The nearest integer to 0.9 is 1. The nearest integer to 0.5 is either 0 or 1. And
2020 Sep 04
4
Misleading documentation on FP to integer conversion instructions?
...lt is prescribed to be 0. > > In actuality, the instruction truncates, returning 0 for all cases. > > Should this be reworded, perhaps to use the word "truncate”? > > > “Rounding towards zero” is a term of art from IEEE 754. See > https://en.wikipedia.org/wiki/IEEE_754#Directed_roundings > > I agree that the documentation could be made more accessible by *also* > using the colloquial term “truncation”, but round-towards-zero is the > correct name for this behavior and should be retained. > > —Owen > _______________________________________________ > LLVM Deve...