mirror of
https://github.com/Sarsoo/csbindgen.git
synced 2024-12-23 15:06:26 +00:00
577 lines
14 KiB
ArmAsm
Vendored
577 lines
14 KiB
ArmAsm
Vendored
/*
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under both the BSD-style license (found in the
|
|
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
|
|
* in the COPYING file in the root directory of this source tree).
|
|
* You may select, at your option, one of the above-listed licenses.
|
|
*/
|
|
|
|
#include "../common/portability_macros.h"
|
|
|
|
/* Stack marking
|
|
* ref: https://wiki.gentoo.org/wiki/Hardened/GNU_stack_quickstart
|
|
*/
|
|
#if defined(__ELF__) && defined(__GNUC__)
|
|
.section .note.GNU-stack,"",%progbits
|
|
#endif
|
|
|
|
#if ZSTD_ENABLE_ASM_X86_64_BMI2
|
|
|
|
/* Calling convention:
|
|
*
|
|
* %rdi contains the first argument: HUF_DecompressAsmArgs*.
|
|
* %rbp isn't maintained (no frame pointer).
|
|
* %rsp contains the stack pointer that grows down.
|
|
* No red-zone is assumed, only addresses >= %rsp are used.
|
|
* All register contents are preserved.
|
|
*
|
|
* TODO: Support Windows calling convention.
|
|
*/
|
|
|
|
ZSTD_HIDE_ASM_FUNCTION(HUF_decompress4X1_usingDTable_internal_fast_asm_loop)
|
|
ZSTD_HIDE_ASM_FUNCTION(HUF_decompress4X2_usingDTable_internal_fast_asm_loop)
|
|
ZSTD_HIDE_ASM_FUNCTION(_HUF_decompress4X2_usingDTable_internal_fast_asm_loop)
|
|
ZSTD_HIDE_ASM_FUNCTION(_HUF_decompress4X1_usingDTable_internal_fast_asm_loop)
|
|
.global HUF_decompress4X1_usingDTable_internal_fast_asm_loop
|
|
.global HUF_decompress4X2_usingDTable_internal_fast_asm_loop
|
|
.global _HUF_decompress4X1_usingDTable_internal_fast_asm_loop
|
|
.global _HUF_decompress4X2_usingDTable_internal_fast_asm_loop
|
|
.text
|
|
|
|
/* Sets up register mappings for clarity.
|
|
* op[], bits[], dtable & ip[0] each get their own register.
|
|
* ip[1,2,3] & olimit alias var[].
|
|
* %rax is a scratch register.
|
|
*/
|
|
|
|
#define op0 rsi
|
|
#define op1 rbx
|
|
#define op2 rcx
|
|
#define op3 rdi
|
|
|
|
#define ip0 r8
|
|
#define ip1 r9
|
|
#define ip2 r10
|
|
#define ip3 r11
|
|
|
|
#define bits0 rbp
|
|
#define bits1 rdx
|
|
#define bits2 r12
|
|
#define bits3 r13
|
|
#define dtable r14
|
|
#define olimit r15
|
|
|
|
/* var[] aliases ip[1,2,3] & olimit
|
|
* ip[1,2,3] are saved every iteration.
|
|
* olimit is only used in compute_olimit.
|
|
*/
|
|
#define var0 r15
|
|
#define var1 r9
|
|
#define var2 r10
|
|
#define var3 r11
|
|
|
|
/* 32-bit var registers */
|
|
#define vard0 r15d
|
|
#define vard1 r9d
|
|
#define vard2 r10d
|
|
#define vard3 r11d
|
|
|
|
/* Calls X(N) for each stream 0, 1, 2, 3. */
|
|
#define FOR_EACH_STREAM(X) \
|
|
X(0); \
|
|
X(1); \
|
|
X(2); \
|
|
X(3)
|
|
|
|
/* Calls X(N, idx) for each stream 0, 1, 2, 3. */
|
|
#define FOR_EACH_STREAM_WITH_INDEX(X, idx) \
|
|
X(0, idx); \
|
|
X(1, idx); \
|
|
X(2, idx); \
|
|
X(3, idx)
|
|
|
|
/* Define both _HUF_* & HUF_* symbols because MacOS
|
|
* C symbols are prefixed with '_' & Linux symbols aren't.
|
|
*/
|
|
_HUF_decompress4X1_usingDTable_internal_fast_asm_loop:
|
|
HUF_decompress4X1_usingDTable_internal_fast_asm_loop:
|
|
ZSTD_CET_ENDBRANCH
|
|
/* Save all registers - even if they are callee saved for simplicity. */
|
|
push %rax
|
|
push %rbx
|
|
push %rcx
|
|
push %rdx
|
|
push %rbp
|
|
push %rsi
|
|
push %rdi
|
|
push %r8
|
|
push %r9
|
|
push %r10
|
|
push %r11
|
|
push %r12
|
|
push %r13
|
|
push %r14
|
|
push %r15
|
|
|
|
/* Read HUF_DecompressAsmArgs* args from %rax */
|
|
movq %rdi, %rax
|
|
movq 0(%rax), %ip0
|
|
movq 8(%rax), %ip1
|
|
movq 16(%rax), %ip2
|
|
movq 24(%rax), %ip3
|
|
movq 32(%rax), %op0
|
|
movq 40(%rax), %op1
|
|
movq 48(%rax), %op2
|
|
movq 56(%rax), %op3
|
|
movq 64(%rax), %bits0
|
|
movq 72(%rax), %bits1
|
|
movq 80(%rax), %bits2
|
|
movq 88(%rax), %bits3
|
|
movq 96(%rax), %dtable
|
|
push %rax /* argument */
|
|
push 104(%rax) /* ilimit */
|
|
push 112(%rax) /* oend */
|
|
push %olimit /* olimit space */
|
|
|
|
subq $24, %rsp
|
|
|
|
.L_4X1_compute_olimit:
|
|
/* Computes how many iterations we can do safely
|
|
* %r15, %rax may be clobbered
|
|
* rbx, rdx must be saved
|
|
* op3 & ip0 mustn't be clobbered
|
|
*/
|
|
movq %rbx, 0(%rsp)
|
|
movq %rdx, 8(%rsp)
|
|
|
|
movq 32(%rsp), %rax /* rax = oend */
|
|
subq %op3, %rax /* rax = oend - op3 */
|
|
|
|
/* r15 = (oend - op3) / 5 */
|
|
movabsq $-3689348814741910323, %rdx
|
|
mulq %rdx
|
|
movq %rdx, %r15
|
|
shrq $2, %r15
|
|
|
|
movq %ip0, %rax /* rax = ip0 */
|
|
movq 40(%rsp), %rdx /* rdx = ilimit */
|
|
subq %rdx, %rax /* rax = ip0 - ilimit */
|
|
movq %rax, %rbx /* rbx = ip0 - ilimit */
|
|
|
|
/* rdx = (ip0 - ilimit) / 7 */
|
|
movabsq $2635249153387078803, %rdx
|
|
mulq %rdx
|
|
subq %rdx, %rbx
|
|
shrq %rbx
|
|
addq %rbx, %rdx
|
|
shrq $2, %rdx
|
|
|
|
/* r15 = min(%rdx, %r15) */
|
|
cmpq %rdx, %r15
|
|
cmova %rdx, %r15
|
|
|
|
/* r15 = r15 * 5 */
|
|
leaq (%r15, %r15, 4), %r15
|
|
|
|
/* olimit = op3 + r15 */
|
|
addq %op3, %olimit
|
|
|
|
movq 8(%rsp), %rdx
|
|
movq 0(%rsp), %rbx
|
|
|
|
/* If (op3 + 20 > olimit) */
|
|
movq %op3, %rax /* rax = op3 */
|
|
addq $20, %rax /* rax = op3 + 20 */
|
|
cmpq %rax, %olimit /* op3 + 20 > olimit */
|
|
jb .L_4X1_exit
|
|
|
|
/* If (ip1 < ip0) go to exit */
|
|
cmpq %ip0, %ip1
|
|
jb .L_4X1_exit
|
|
|
|
/* If (ip2 < ip1) go to exit */
|
|
cmpq %ip1, %ip2
|
|
jb .L_4X1_exit
|
|
|
|
/* If (ip3 < ip2) go to exit */
|
|
cmpq %ip2, %ip3
|
|
jb .L_4X1_exit
|
|
|
|
/* Reads top 11 bits from bits[n]
|
|
* Loads dt[bits[n]] into var[n]
|
|
*/
|
|
#define GET_NEXT_DELT(n) \
|
|
movq $53, %var##n; \
|
|
shrxq %var##n, %bits##n, %var##n; \
|
|
movzwl (%dtable,%var##n,2),%vard##n
|
|
|
|
/* var[n] must contain the DTable entry computed with GET_NEXT_DELT
|
|
* Moves var[n] to %rax
|
|
* bits[n] <<= var[n] & 63
|
|
* op[n][idx] = %rax >> 8
|
|
* %ah is a way to access bits [8, 16) of %rax
|
|
*/
|
|
#define DECODE_FROM_DELT(n, idx) \
|
|
movq %var##n, %rax; \
|
|
shlxq %var##n, %bits##n, %bits##n; \
|
|
movb %ah, idx(%op##n)
|
|
|
|
/* Assumes GET_NEXT_DELT has been called.
|
|
* Calls DECODE_FROM_DELT then GET_NEXT_DELT
|
|
*/
|
|
#define DECODE_AND_GET_NEXT(n, idx) \
|
|
DECODE_FROM_DELT(n, idx); \
|
|
GET_NEXT_DELT(n) \
|
|
|
|
/* // ctz & nbBytes is stored in bits[n]
|
|
* // nbBits is stored in %rax
|
|
* ctz = CTZ[bits[n]]
|
|
* nbBits = ctz & 7
|
|
* nbBytes = ctz >> 3
|
|
* op[n] += 5
|
|
* ip[n] -= nbBytes
|
|
* // Note: x86-64 is little-endian ==> no bswap
|
|
* bits[n] = MEM_readST(ip[n]) | 1
|
|
* bits[n] <<= nbBits
|
|
*/
|
|
#define RELOAD_BITS(n) \
|
|
bsfq %bits##n, %bits##n; \
|
|
movq %bits##n, %rax; \
|
|
andq $7, %rax; \
|
|
shrq $3, %bits##n; \
|
|
leaq 5(%op##n), %op##n; \
|
|
subq %bits##n, %ip##n; \
|
|
movq (%ip##n), %bits##n; \
|
|
orq $1, %bits##n; \
|
|
shlx %rax, %bits##n, %bits##n
|
|
|
|
/* Store clobbered variables on the stack */
|
|
movq %olimit, 24(%rsp)
|
|
movq %ip1, 0(%rsp)
|
|
movq %ip2, 8(%rsp)
|
|
movq %ip3, 16(%rsp)
|
|
|
|
/* Call GET_NEXT_DELT for each stream */
|
|
FOR_EACH_STREAM(GET_NEXT_DELT)
|
|
|
|
.p2align 6
|
|
|
|
.L_4X1_loop_body:
|
|
/* Decode 5 symbols in each of the 4 streams (20 total)
|
|
* Must have called GET_NEXT_DELT for each stream
|
|
*/
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 0)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 1)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 2)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE_AND_GET_NEXT, 3)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE_FROM_DELT, 4)
|
|
|
|
/* Load ip[1,2,3] from stack (var[] aliases them)
|
|
* ip[] is needed for RELOAD_BITS
|
|
* Each will be stored back to the stack after RELOAD
|
|
*/
|
|
movq 0(%rsp), %ip1
|
|
movq 8(%rsp), %ip2
|
|
movq 16(%rsp), %ip3
|
|
|
|
/* Reload each stream & fetch the next table entry
|
|
* to prepare for the next iteration
|
|
*/
|
|
RELOAD_BITS(0)
|
|
GET_NEXT_DELT(0)
|
|
|
|
RELOAD_BITS(1)
|
|
movq %ip1, 0(%rsp)
|
|
GET_NEXT_DELT(1)
|
|
|
|
RELOAD_BITS(2)
|
|
movq %ip2, 8(%rsp)
|
|
GET_NEXT_DELT(2)
|
|
|
|
RELOAD_BITS(3)
|
|
movq %ip3, 16(%rsp)
|
|
GET_NEXT_DELT(3)
|
|
|
|
/* If op3 < olimit: continue the loop */
|
|
cmp %op3, 24(%rsp)
|
|
ja .L_4X1_loop_body
|
|
|
|
/* Reload ip[1,2,3] from stack */
|
|
movq 0(%rsp), %ip1
|
|
movq 8(%rsp), %ip2
|
|
movq 16(%rsp), %ip3
|
|
|
|
/* Re-compute olimit */
|
|
jmp .L_4X1_compute_olimit
|
|
|
|
#undef GET_NEXT_DELT
|
|
#undef DECODE_FROM_DELT
|
|
#undef DECODE
|
|
#undef RELOAD_BITS
|
|
.L_4X1_exit:
|
|
addq $24, %rsp
|
|
|
|
/* Restore stack (oend & olimit) */
|
|
pop %rax /* olimit */
|
|
pop %rax /* oend */
|
|
pop %rax /* ilimit */
|
|
pop %rax /* arg */
|
|
|
|
/* Save ip / op / bits */
|
|
movq %ip0, 0(%rax)
|
|
movq %ip1, 8(%rax)
|
|
movq %ip2, 16(%rax)
|
|
movq %ip3, 24(%rax)
|
|
movq %op0, 32(%rax)
|
|
movq %op1, 40(%rax)
|
|
movq %op2, 48(%rax)
|
|
movq %op3, 56(%rax)
|
|
movq %bits0, 64(%rax)
|
|
movq %bits1, 72(%rax)
|
|
movq %bits2, 80(%rax)
|
|
movq %bits3, 88(%rax)
|
|
|
|
/* Restore registers */
|
|
pop %r15
|
|
pop %r14
|
|
pop %r13
|
|
pop %r12
|
|
pop %r11
|
|
pop %r10
|
|
pop %r9
|
|
pop %r8
|
|
pop %rdi
|
|
pop %rsi
|
|
pop %rbp
|
|
pop %rdx
|
|
pop %rcx
|
|
pop %rbx
|
|
pop %rax
|
|
ret
|
|
|
|
_HUF_decompress4X2_usingDTable_internal_fast_asm_loop:
|
|
HUF_decompress4X2_usingDTable_internal_fast_asm_loop:
|
|
ZSTD_CET_ENDBRANCH
|
|
/* Save all registers - even if they are callee saved for simplicity. */
|
|
push %rax
|
|
push %rbx
|
|
push %rcx
|
|
push %rdx
|
|
push %rbp
|
|
push %rsi
|
|
push %rdi
|
|
push %r8
|
|
push %r9
|
|
push %r10
|
|
push %r11
|
|
push %r12
|
|
push %r13
|
|
push %r14
|
|
push %r15
|
|
|
|
movq %rdi, %rax
|
|
movq 0(%rax), %ip0
|
|
movq 8(%rax), %ip1
|
|
movq 16(%rax), %ip2
|
|
movq 24(%rax), %ip3
|
|
movq 32(%rax), %op0
|
|
movq 40(%rax), %op1
|
|
movq 48(%rax), %op2
|
|
movq 56(%rax), %op3
|
|
movq 64(%rax), %bits0
|
|
movq 72(%rax), %bits1
|
|
movq 80(%rax), %bits2
|
|
movq 88(%rax), %bits3
|
|
movq 96(%rax), %dtable
|
|
push %rax /* argument */
|
|
push %rax /* olimit */
|
|
push 104(%rax) /* ilimit */
|
|
|
|
movq 112(%rax), %rax
|
|
push %rax /* oend3 */
|
|
|
|
movq %op3, %rax
|
|
push %rax /* oend2 */
|
|
|
|
movq %op2, %rax
|
|
push %rax /* oend1 */
|
|
|
|
movq %op1, %rax
|
|
push %rax /* oend0 */
|
|
|
|
/* Scratch space */
|
|
subq $8, %rsp
|
|
|
|
.L_4X2_compute_olimit:
|
|
/* Computes how many iterations we can do safely
|
|
* %r15, %rax may be clobbered
|
|
* rdx must be saved
|
|
* op[1,2,3,4] & ip0 mustn't be clobbered
|
|
*/
|
|
movq %rdx, 0(%rsp)
|
|
|
|
/* We can consume up to 7 input bytes each iteration. */
|
|
movq %ip0, %rax /* rax = ip0 */
|
|
movq 40(%rsp), %rdx /* rdx = ilimit */
|
|
subq %rdx, %rax /* rax = ip0 - ilimit */
|
|
movq %rax, %r15 /* r15 = ip0 - ilimit */
|
|
|
|
/* rdx = rax / 7 */
|
|
movabsq $2635249153387078803, %rdx
|
|
mulq %rdx
|
|
subq %rdx, %r15
|
|
shrq %r15
|
|
addq %r15, %rdx
|
|
shrq $2, %rdx
|
|
|
|
/* r15 = (ip0 - ilimit) / 7 */
|
|
movq %rdx, %r15
|
|
|
|
/* r15 = min(r15, min(oend0 - op0, oend1 - op1, oend2 - op2, oend3 - op3) / 10) */
|
|
movq 8(%rsp), %rax /* rax = oend0 */
|
|
subq %op0, %rax /* rax = oend0 - op0 */
|
|
movq 16(%rsp), %rdx /* rdx = oend1 */
|
|
subq %op1, %rdx /* rdx = oend1 - op1 */
|
|
|
|
cmpq %rax, %rdx
|
|
cmova %rax, %rdx /* rdx = min(%rdx, %rax) */
|
|
|
|
movq 24(%rsp), %rax /* rax = oend2 */
|
|
subq %op2, %rax /* rax = oend2 - op2 */
|
|
|
|
cmpq %rax, %rdx
|
|
cmova %rax, %rdx /* rdx = min(%rdx, %rax) */
|
|
|
|
movq 32(%rsp), %rax /* rax = oend3 */
|
|
subq %op3, %rax /* rax = oend3 - op3 */
|
|
|
|
cmpq %rax, %rdx
|
|
cmova %rax, %rdx /* rdx = min(%rdx, %rax) */
|
|
|
|
movabsq $-3689348814741910323, %rax
|
|
mulq %rdx
|
|
shrq $3, %rdx /* rdx = rdx / 10 */
|
|
|
|
/* r15 = min(%rdx, %r15) */
|
|
cmpq %rdx, %r15
|
|
cmova %rdx, %r15
|
|
|
|
/* olimit = op3 + 5 * r15 */
|
|
movq %r15, %rax
|
|
leaq (%op3, %rax, 4), %olimit
|
|
addq %rax, %olimit
|
|
|
|
movq 0(%rsp), %rdx
|
|
|
|
/* If (op3 + 10 > olimit) */
|
|
movq %op3, %rax /* rax = op3 */
|
|
addq $10, %rax /* rax = op3 + 10 */
|
|
cmpq %rax, %olimit /* op3 + 10 > olimit */
|
|
jb .L_4X2_exit
|
|
|
|
/* If (ip1 < ip0) go to exit */
|
|
cmpq %ip0, %ip1
|
|
jb .L_4X2_exit
|
|
|
|
/* If (ip2 < ip1) go to exit */
|
|
cmpq %ip1, %ip2
|
|
jb .L_4X2_exit
|
|
|
|
/* If (ip3 < ip2) go to exit */
|
|
cmpq %ip2, %ip3
|
|
jb .L_4X2_exit
|
|
|
|
#define DECODE(n, idx) \
|
|
movq %bits##n, %rax; \
|
|
shrq $53, %rax; \
|
|
movzwl 0(%dtable,%rax,4),%r8d; \
|
|
movzbl 2(%dtable,%rax,4),%r15d; \
|
|
movzbl 3(%dtable,%rax,4),%eax; \
|
|
movw %r8w, (%op##n); \
|
|
shlxq %r15, %bits##n, %bits##n; \
|
|
addq %rax, %op##n
|
|
|
|
#define RELOAD_BITS(n) \
|
|
bsfq %bits##n, %bits##n; \
|
|
movq %bits##n, %rax; \
|
|
shrq $3, %bits##n; \
|
|
andq $7, %rax; \
|
|
subq %bits##n, %ip##n; \
|
|
movq (%ip##n), %bits##n; \
|
|
orq $1, %bits##n; \
|
|
shlxq %rax, %bits##n, %bits##n
|
|
|
|
|
|
movq %olimit, 48(%rsp)
|
|
|
|
.p2align 6
|
|
|
|
.L_4X2_loop_body:
|
|
/* We clobber r8, so store it on the stack */
|
|
movq %r8, 0(%rsp)
|
|
|
|
/* Decode 5 symbols from each of the 4 streams (20 symbols total). */
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE, 0)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE, 1)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE, 2)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE, 3)
|
|
FOR_EACH_STREAM_WITH_INDEX(DECODE, 4)
|
|
|
|
/* Reload r8 */
|
|
movq 0(%rsp), %r8
|
|
|
|
FOR_EACH_STREAM(RELOAD_BITS)
|
|
|
|
cmp %op3, 48(%rsp)
|
|
ja .L_4X2_loop_body
|
|
jmp .L_4X2_compute_olimit
|
|
|
|
#undef DECODE
|
|
#undef RELOAD_BITS
|
|
.L_4X2_exit:
|
|
addq $8, %rsp
|
|
/* Restore stack (oend & olimit) */
|
|
pop %rax /* oend0 */
|
|
pop %rax /* oend1 */
|
|
pop %rax /* oend2 */
|
|
pop %rax /* oend3 */
|
|
pop %rax /* ilimit */
|
|
pop %rax /* olimit */
|
|
pop %rax /* arg */
|
|
|
|
/* Save ip / op / bits */
|
|
movq %ip0, 0(%rax)
|
|
movq %ip1, 8(%rax)
|
|
movq %ip2, 16(%rax)
|
|
movq %ip3, 24(%rax)
|
|
movq %op0, 32(%rax)
|
|
movq %op1, 40(%rax)
|
|
movq %op2, 48(%rax)
|
|
movq %op3, 56(%rax)
|
|
movq %bits0, 64(%rax)
|
|
movq %bits1, 72(%rax)
|
|
movq %bits2, 80(%rax)
|
|
movq %bits3, 88(%rax)
|
|
|
|
/* Restore registers */
|
|
pop %r15
|
|
pop %r14
|
|
pop %r13
|
|
pop %r12
|
|
pop %r11
|
|
pop %r10
|
|
pop %r9
|
|
pop %r8
|
|
pop %rdi
|
|
pop %rsi
|
|
pop %rbp
|
|
pop %rdx
|
|
pop %rcx
|
|
pop %rbx
|
|
pop %rax
|
|
ret
|
|
|
|
#endif
|