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bcachefs: rewrote prefetch asm in gas syntax for clang compatibility

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Signed-off-by: Brett Holman <bpholman5@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Brett Holman 2021-05-21 16:45:38 -06:00 • committed by Kent Overstreet
parent 1ce0cf5fe9
commit 2eba51a69a
1 changed files with 5 additions and 7 deletions
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12
fs/bcachefs/bset.c
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@ -1181,13 +1181,11 @@ static struct bkey_packed *bset_search_write_set(const struct btree *b,
static inline void prefetch_four_cachelines(void *p)
{
#if (CONFIG_X86_64 && !defined(__clang__))
asm(".intel_syntax noprefix;"
"prefetcht0 [%0 - 127 + 64 * 0];"
"prefetcht0 [%0 - 127 + 64 * 1];"
"prefetcht0 [%0 - 127 + 64 * 2];"
"prefetcht0 [%0 - 127 + 64 * 3];"
".att_syntax prefix;"
#if CONFIG_X86_64
asm("prefetcht0 (-127 + 64 * 0)(%0);"
"prefetcht0 (-127 + 64 * 1)(%0);"
"prefetcht0 (-127 + 64 * 2)(%0);"
"prefetcht0 (-127 + 64 * 3)(%0);"
:
: "r" (p + 127));
#else