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Make atomics faster on aarch64

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This change implements the compiler runtime for ARM v8.1 ISE atomics and
gets rid of the mandatory -mno-outline-atomics flag. It can dramatically
speed things up, on newer ARM CPUs, as indicated by the changed lines in
test/libc/thread/footek_test.c. In llamafile dispatching on hwcap atomic
also shaved microseconds off synchronization barriers.
This commit is contained in:
Justine Tunney 2024-08-16 11:05:37 -07:00
parent de0cde8def
commit 11d9fb521d
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GPG key ID: BE714B4575D6E328
12 changed files with 2053 additions and 71 deletions
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2
tool/build/fixupobj.c
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@ -245,7 +245,7 @@ static void CheckPrivilegedCrossReferences(void) {
if (~shdr->sh_flags & SHF_EXECINSTR)
continue; // data reference
if ((secname = GetElfString(elf, esize, secstrs, shdr->sh_name)) &&
strcmp(".privileged", secname)) {
!startswith(secname, ".privileged")) {
tinyprint(2, epath,
": code in .privileged section "
"references symbol '",