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