https://gcc.gnu.org/g:e35e53994a61377ca7c472e5a0c158b6eb18665e
commit r16-7728-ge35e53994a61377ca7c472e5a0c158b6eb18665e Author: Andre Vehreschild <[email protected]> Date: Mon Sep 1 14:11:27 2025 +0200 Fortran: Detect working CLZL or use alternative. libgfortran/ChangeLog: * caf/shmem/allocator.c (next_power_of_two): Use sane clzl implementation or alternative. Diff: --- libgfortran/caf/shmem/allocator.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/libgfortran/caf/shmem/allocator.c b/libgfortran/caf/shmem/allocator.c index d900167cfc24..3ea4d50e045a 100644 --- a/libgfortran/caf/shmem/allocator.c +++ b/libgfortran/caf/shmem/allocator.c @@ -25,6 +25,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see /* Main allocation routine, works like malloc. Round up allocations to the next power of two and keep free lists in buckets. */ +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + #include "libgfortran.h" #include "allocator.h" @@ -74,8 +78,16 @@ allocator_init_supervisor (allocator *a, allocator_shared *s, shared_memory sm) static size_t next_power_of_two (size_t size) { +#ifdef HAVE_SANE_BUILTIN_CLZL assert (size); +#if (__INTPTR_WIDTH__ == 64) return 1 << (VOIDP_BITS - __builtin_clzl (size - 1)); +#else + return 1 << (VOIDP_BITS - __builtin_clz (size - 1)); +#endif +#else + return 1 << (int)ceil(log2(size)); +#endif } shared_mem_ptr
