https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 0dd3ee31125508cd67f7e7172247f05b7fd1753a authored by Linus Torvalds on 07 January 2024, 20:18:38 UTC
Linux 6.7
Linux 6.7
Tip revision: 0dd3ee3
udivsi3.S
/* SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0 */
#include <linux/linkage.h>
#include <asm/asmmacro.h>
#include <asm/core.h>
ENTRY(__udivsi3)
abi_entry_default
#if XCHAL_HAVE_DIV32
quou a2, a2, a3
#else
bltui a3, 2, .Lle_one /* check if the divisor <= 1 */
mov a6, a2 /* keep dividend in a6 */
do_nsau a5, a6, a2, a7 /* dividend_shift = nsau (dividend) */
do_nsau a4, a3, a2, a7 /* divisor_shift = nsau (divisor) */
bgeu a5, a4, .Lspecial
sub a4, a4, a5 /* count = divisor_shift - dividend_shift */
ssl a4
sll a3, a3 /* divisor <<= count */
movi a2, 0 /* quotient = 0 */
/* test-subtract-and-shift loop; one quotient bit on each iteration */
#if XCHAL_HAVE_LOOPS
loopnez a4, .Lloopend
#endif /* XCHAL_HAVE_LOOPS */
.Lloop:
bltu a6, a3, .Lzerobit
sub a6, a6, a3
addi a2, a2, 1
.Lzerobit:
slli a2, a2, 1
srli a3, a3, 1
#if !XCHAL_HAVE_LOOPS
addi a4, a4, -1
bnez a4, .Lloop
#endif /* !XCHAL_HAVE_LOOPS */
.Lloopend:
bltu a6, a3, .Lreturn
addi a2, a2, 1 /* increment quotient if dividend >= divisor */
.Lreturn:
abi_ret_default
.Lle_one:
beqz a3, .Lerror /* if divisor == 1, return the dividend */
abi_ret_default
.Lspecial:
/* return dividend >= divisor */
bltu a6, a3, .Lreturn0
movi a2, 1
abi_ret_default
.Lerror:
/* Divide by zero: Use an illegal instruction to force an exception.
The subsequent "DIV0" string can be recognized by the exception
handler to identify the real cause of the exception. */
ill
.ascii "DIV0"
.Lreturn0:
movi a2, 0
#endif /* XCHAL_HAVE_DIV32 */
abi_ret_default
ENDPROC(__udivsi3)
EXPORT_SYMBOL(__udivsi3)