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| author | Jakub Jelinek <jakub@redhat.com> | 2024-01-31 19:17:27 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2024-01-31 19:17:27 +0100 |
| commit | da89496337b97e6a2aaf1e81d55cf998f6db1070 (patch) | |
| tree | 387c162fccd66a88e5663ee69e0ee131f183615d /NEWS | |
| parent | 903cd866060555c77abbf70d0d85994ec5a18193 (diff) | |
| download | glibc-da89496337b97e6a2aaf1e81d55cf998f6db1070.zip glibc-da89496337b97e6a2aaf1e81d55cf998f6db1070.tar.gz glibc-da89496337b97e6a2aaf1e81d55cf998f6db1070.tar.bz2 | |
Use gcc __builtin_stdc_* builtins in stdbit.h if possible
The following patch uses the GCC 14 __builtin_stdc_* builtins in stdbit.h
for the type-generic macros, so that when compiled with GCC 14 or later,
it supports not just 8/16/32/64-bit unsigned integers, but also 128-bit
(if target supports them) and unsigned _BitInt (any supported precision).
And so that the macros don't expand arguments multiple times and can be
evaluated in constant expressions.
The new testcase is gcc's gcc/testsuite/gcc.dg/builtin-stdc-bit-1.c
adjusted to test stdbit.h and the type-generic macros in there instead
of the builtins and adjusted to use glibc test framework rather than
gcc style tests with __builtin_abort ().
Signed-off-by: Jakub Jelinek <jakub@redhat.com>
Reviewed-by: Joseph Myers <josmyers@redhat.com>
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 5 |
1 files changed, 4 insertions, 1 deletions
@@ -9,7 +9,10 @@ Version 2.40 Major new features: - [Add new features here] +* The <stdbit.h> header type-generic macros have been changed when using + GCC 14.1 or later to use __builtin_stdc_bit_ceil etc. built-in functions + in order to support unsigned __int128 and/or unsigned _BitInt(N) operands + with arbitrary precisions when supported by the target. Deprecated and removed features, and other changes affecting compatibility: |