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authorWilco Dijkstra <wilco.dijkstra@arm.com>2022-11-15 14:38:55 +0000
committerWilco Dijkstra <wilco.dijkstra@arm.com>2022-11-15 15:08:33 +0000
commitd1288d850944f69a795e4ff444a427eba3fec11b (patch)
tree0357dd0e95cb2e1825217396f7ff76fe6b1a377b /libatomic/configure.tgt
parent5925f0ec54ab5ed773935eec09a602f58fa0ca2c (diff)
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libatomic: Add support for LSE and LSE2
Add support for AArch64 LSE and LSE2 to libatomic. Disable outline atomics, and use LSE ifuncs for 1-8 byte atomics and LSE2 ifuncs for 16-byte atomics. On Neoverse V1, 16-byte atomics are ~4x faster due to avoiding locks. Note this is safe since we swap all 16-byte atomics using the same ifunc, so they either use locks or LSE2 atomics, but never a mix. This also improves ABI compatibility with LLVM: its inlined 16-byte atomics are compatible with the new libatomic if LSE2 is supported. libatomic/ * Makefile.in: Regenerated with automake 1.15.1. * Makefile.am: Add atomic_16.S for AArch64. * configure.tgt: Disable outline atomics in AArch64 build. * config/linux/aarch64/atomic_16.S: New file - implementation of ifuncs for 16-byte atomics. * config/linux/aarch64/host-config.h: Enable ifuncs, use LSE (HWCAP_ATOMICS) for 1-8-byte atomics and LSE2 (HWCAP_USCAT) for 16-byte atomics.
Diffstat (limited to 'libatomic/configure.tgt')
-rw-r--r--libatomic/configure.tgt1
1 files changed, 1 insertions, 0 deletions
diff --git a/libatomic/configure.tgt b/libatomic/configure.tgt
index 86a5947..57f0936 100644
--- a/libatomic/configure.tgt
+++ b/libatomic/configure.tgt
@@ -49,6 +49,7 @@ case "${target_cpu}" in
fi
;;
esac
+ XCFLAGS="${XCFLAGS} -mno-outline-atomics"
;;
arm*)
ARCH=arm