https://gcc.gnu.org/g:022cfc9137405abd5054943da68c4e9aa303d775
commit r16-7019-g022cfc9137405abd5054943da68c4e9aa303d775 Author: Xin Wang <[email protected]> Date: Sat Jan 24 23:54:46 2026 +0000 libgcc: Use UTItype with mode(TI) for 16-byte atomics The use of UOItype with mode(OI) for 16-byte atomic operations is non-standard. The OI mode is not defined in machmode.def and exists only as an ad-hoc construct in libgcc/sync.c. This patch replaces it with UTItype using mode(TI), which is the standard GCC machine mode for 16-byte integers (Tetra Integer). The size argument is also corrected from 8 to 16 to match the actual operand width. libgcc/ChangeLog: * sync.c: Replace UOItype with UTItype and use mode(TI) pass 16, not 8, to DEFINE macro. Signed-off-by: Xin Wang <[email protected]> Diff: --- libgcc/sync.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/libgcc/sync.c b/libgcc/sync.c index 1cb816613196..18b91164a809 100644 --- a/libgcc/sync.c +++ b/libgcc/sync.c @@ -124,10 +124,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see /* Find an appropriate type TYPE for SIZE and invoke DEFINE (FN, SIZE, TYPE). - The types chosen here may be incorrect for some targets. - For example, targets with 16-byte atomicity support might not - support OImode. We would need some kind of target-specific - override if that becomes a problem. */ + The types chosen here are based on standard GCC modes. + If a target supports atomic operations for a given SIZE but lacks + the corresponding mode, a target-specific override will be needed. */ #if SIZE == 1 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 @@ -151,8 +150,8 @@ DEFINE (FN, 8, UDItype) #elif SIZE == 16 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 -typedef unsigned int UOItype __attribute__((mode (OI))); -DEFINE (FN, 8, UOItype) +typedef unsigned int UTItype __attribute__((mode (TI))); +DEFINE (FN, 16, UTItype) #endif
