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Diffstat (limited to 'ports/sysdeps/alpha/reml.S')
| -rw-r--r-- | ports/sysdeps/alpha/reml.S | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/ports/sysdeps/alpha/reml.S b/ports/sysdeps/alpha/reml.S new file mode 100644 index 0000000000..e590760963 --- /dev/null +++ b/ports/sysdeps/alpha/reml.S @@ -0,0 +1,86 @@ +/* Copyright (C) 2004 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@twiddle.net> + 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 remainder. 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 the division for all input values except zero. + All we have to do is compute the remainder via multiply-and-subtract. + + 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 __reml + .type __reml, @funcnoplt + .usepv __reml, no + + cfi_startproc + cfi_return_column (RA) +__reml: + 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) + mull RV, Y, RV + 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) + subl X, RV, RV + ret $31, (RA), 1 + + cfi_endproc + .size __reml, .-__reml + + DO_DIVBYZERO |