130 lines
2.6 KiB
C
130 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _BCACHEFS_BKEY_CMP_H
|
|
#define _BCACHEFS_BKEY_CMP_H
|
|
|
|
#include "bkey.h"
|
|
|
|
#ifdef CONFIG_X86_64
|
|
static inline int __bkey_cmp_bits(const u64 *l, const u64 *r,
|
|
unsigned nr_key_bits)
|
|
{
|
|
long d0, d1, d2, d3;
|
|
int cmp;
|
|
|
|
/* we shouldn't need asm for this, but gcc is being retarded: */
|
|
|
|
asm(".intel_syntax noprefix;"
|
|
"xor eax, eax;"
|
|
"xor edx, edx;"
|
|
"1:;"
|
|
"mov r8, [rdi];"
|
|
"mov r9, [rsi];"
|
|
"sub ecx, 64;"
|
|
"jl 2f;"
|
|
|
|
"cmp r8, r9;"
|
|
"jnz 3f;"
|
|
|
|
"lea rdi, [rdi - 8];"
|
|
"lea rsi, [rsi - 8];"
|
|
"jmp 1b;"
|
|
|
|
"2:;"
|
|
"not ecx;"
|
|
"shr r8, 1;"
|
|
"shr r9, 1;"
|
|
"shr r8, cl;"
|
|
"shr r9, cl;"
|
|
"cmp r8, r9;"
|
|
|
|
"3:\n"
|
|
"seta al;"
|
|
"setb dl;"
|
|
"sub eax, edx;"
|
|
".att_syntax prefix;"
|
|
: "=&D" (d0), "=&S" (d1), "=&d" (d2), "=&c" (d3), "=&a" (cmp)
|
|
: "0" (l), "1" (r), "3" (nr_key_bits)
|
|
: "r8", "r9", "cc", "memory");
|
|
|
|
return cmp;
|
|
}
|
|
#else
|
|
static inline int __bkey_cmp_bits(const u64 *l, const u64 *r,
|
|
unsigned nr_key_bits)
|
|
{
|
|
u64 l_v, r_v;
|
|
|
|
if (!nr_key_bits)
|
|
return 0;
|
|
|
|
/* for big endian, skip past header */
|
|
nr_key_bits += high_bit_offset;
|
|
l_v = *l & (~0ULL >> high_bit_offset);
|
|
r_v = *r & (~0ULL >> high_bit_offset);
|
|
|
|
while (1) {
|
|
if (nr_key_bits < 64) {
|
|
l_v >>= 64 - nr_key_bits;
|
|
r_v >>= 64 - nr_key_bits;
|
|
nr_key_bits = 0;
|
|
} else {
|
|
nr_key_bits -= 64;
|
|
}
|
|
|
|
if (!nr_key_bits || l_v != r_v)
|
|
break;
|
|
|
|
l = next_word(l);
|
|
r = next_word(r);
|
|
|
|
l_v = *l;
|
|
r_v = *r;
|
|
}
|
|
|
|
return cmp_int(l_v, r_v);
|
|
}
|
|
#endif
|
|
|
|
static inline __pure __flatten
|
|
int __bch2_bkey_cmp_packed_format_checked_inlined(const struct bkey_packed *l,
|
|
const struct bkey_packed *r,
|
|
const struct btree *b)
|
|
{
|
|
const struct bkey_format *f = &b->format;
|
|
int ret;
|
|
|
|
EBUG_ON(!bkey_packed(l) || !bkey_packed(r));
|
|
EBUG_ON(b->nr_key_bits != bkey_format_key_bits(f));
|
|
|
|
ret = __bkey_cmp_bits(high_word(f, l),
|
|
high_word(f, r),
|
|
b->nr_key_bits);
|
|
|
|
EBUG_ON(ret != bpos_cmp(bkey_unpack_pos(b, l),
|
|
bkey_unpack_pos(b, r)));
|
|
return ret;
|
|
}
|
|
|
|
static inline __pure __flatten
|
|
int bch2_bkey_cmp_packed_inlined(const struct btree *b,
|
|
const struct bkey_packed *l,
|
|
const struct bkey_packed *r)
|
|
{
|
|
struct bkey unpacked;
|
|
|
|
if (likely(bkey_packed(l) && bkey_packed(r)))
|
|
return __bch2_bkey_cmp_packed_format_checked_inlined(l, r, b);
|
|
|
|
if (bkey_packed(l)) {
|
|
__bkey_unpack_key_format_checked(b, &unpacked, l);
|
|
l = (void *) &unpacked;
|
|
} else if (bkey_packed(r)) {
|
|
__bkey_unpack_key_format_checked(b, &unpacked, r);
|
|
r = (void *) &unpacked;
|
|
}
|
|
|
|
return bpos_cmp(((struct bkey *) l)->p, ((struct bkey *) r)->p);
|
|
}
|
|
|
|
#endif /* _BCACHEFS_BKEY_CMP_H */
|