tree 7e346e387f88420cff4da113e1a1d9ac23223ed3
parent 7e149e40c7a2d8049ecd28d1f83f64cc197cc128
author Derek Mauro <dmauro@google.com> 1714752862 -0700
committer Copybara-Service <copybara-worker@google.com> 1714752927 -0700

Use __builtin_ctzg and __builtin_clzg in the implementations of
CountTrailingZeroesNonzero16 and CountLeadingZeroes16 when they are
available.

GCC 14 and Clang 19 adds these new builtins. The g-suffix is for
"generic". The s-suffix on __builtin_ctzs and __builtin_clzs is for
"short". GCC never implemented the short versions and #1664 reports
GCC 14 (pre-release) gives an error here, although this may be a
pre-release bug.

Fixes #1664

PiperOrigin-RevId: 630408249
Change-Id: I4aedcc82b85430f50d025f8eb1cab089c6fcd1bc