mirror of git://git.musl-libc.org/musl
61b1e75f7d
sh needs runtime-selected atomic backends since there are a number of supported models that use non-forwards-compatible (non-smp-compatible) atomic mechanisms. previously, the code paths for this were highly inefficient since they involved C function calls with multiple branches in the callee and heavy spills in the caller. the new code performs calls the runtime-selected asm fragment from inline asm with extremely minimal clobbers, rather than using a function call. for the sh4a case where the atomic mechanism is known and there is no forward-compatibility issue, the movli.l and movco.l instructions are provided as a_ll and a_sc, allowing the new shared atomic.h to generate efficient inline versions of all the basic atomic operations without needing a cas loop. |
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.. | ||
bits | ||
src | ||
atomic_arch.h | ||
crt_arch.h | ||
ksigaction.h | ||
pthread_arch.h | ||
reloc.h | ||
syscall_arch.h |