This is the mail archive of the fortran@gcc.gnu.org mailing list for the GNU Fortran project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[fortran, patch] LEADZ and TRAILZ for integer(kind=16)


Attached patch improves the code generated for the LEADZ and TRAILZ intrinsics. For integer(kind=16), which is larger than C long long type, no builtin is present in the middle-end. Currently, we called library clz128/ctz128 functions in libgfortran.

The patch allows to directly generate code inline, which does basic arithmetic and call the middle-end long long builtins. This leads to better and faster code.

The question I have is: what should be done with the libgfortran functions? I think, for backward compatibility, we need to keep them, but I may be wrong.


Bootstrapped and regtested on x86_64-linux. OK to commit? (potentially with libgfortran functions removal, if deemed suitable)

FX
 


Attachment: clz_ctz.ChangeLog
Description: Binary data

Attachment: clz_ctz.diff
Description: Binary data


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]