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glibc/ports/sysdeps/alpha/divl.S
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/* Copyright (C) 2004 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library. If not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include "div_libc.h" | |
/* 32-bit signed int divide. This is not a normal C function. Argument | |
registers are t10 and t11, the result goes in t12. Only t12 and AT may | |
be clobbered. | |
The FPU can handle all input values except zero. Whee! | |
The FPCR save/restore is due to the fact that the EV6 _will_ set FPCR_INE | |
for cvttq/c even without /sui being set. It will not, however, properly | |
raise the exception, so we don't have to worry about FPCR_INED being clear | |
and so dying by SIGFPE. */ | |
#ifndef EXTEND | |
#define EXTEND(S,D) sextl S, D | |
#endif | |
.text | |
.align 4 | |
.globl __divl | |
.type __divl, @funcnoplt | |
.usepv __divl, no | |
cfi_startproc | |
cfi_return_column (RA) | |
__divl: | |
lda sp, -FRAME(sp) | |
cfi_def_cfa_offset (FRAME) | |
CALL_MCOUNT | |
stt $f0, 0(sp) | |
excb | |
beq Y, DIVBYZERO | |
stt $f1, 8(sp) | |
stt $f2, 16(sp) | |
cfi_rel_offset ($f0, 0) | |
cfi_rel_offset ($f1, 8) | |
cfi_rel_offset ($f2, 16) | |
mf_fpcr $f2 | |
EXTEND (X, RV) | |
EXTEND (Y, AT) | |
_ITOFT2 RV, $f0, 24, AT, $f1, 32 | |
cvtqt $f0, $f0 | |
cvtqt $f1, $f1 | |
divt/c $f0, $f1, $f0 | |
cvttq/c $f0, $f0 | |
excb | |
mt_fpcr $f2 | |
_FTOIT $f0, RV, 24 | |
ldt $f0, 0(sp) | |
ldt $f1, 8(sp) | |
ldt $f2, 16(sp) | |
lda sp, FRAME(sp) | |
cfi_restore ($f0) | |
cfi_restore ($f1) | |
cfi_restore ($f2) | |
cfi_def_cfa_offset (0) | |
sextl RV, RV | |
ret $31, (RA), 1 | |
cfi_endproc | |
.size __divl, .-__divl | |
DO_DIVBYZERO |