| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2004-2015 Free Software Foundation, Inc. |
| 2 | Contributed by Richard Henderson <rth@twiddle.net> |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "div_libc.h" |
| 20 | |
| 21 | /* 32-bit signed int remainder. This is not a normal C function. Argument |
| 22 | registers are t10 and t11, the result goes in t12. Only t12 and AT may |
| 23 | be clobbered. |
| 24 | |
| 25 | The FPU can handle the division for all input values except zero. |
| 26 | All we have to do is compute the remainder via multiply-and-subtract. |
| 27 | |
| 28 | The FPCR save/restore is due to the fact that the EV6 _will_ set FPCR_INE |
| 29 | for cvttq/c even without /sui being set. It will not, however, properly |
| 30 | raise the exception, so we don't have to worry about FPCR_INED being clear |
| 31 | and so dying by SIGFPE. */ |
| 32 | |
| 33 | #ifndef EXTEND |
| 34 | #define EXTEND(S,D) sextl S, D |
| 35 | #endif |
| 36 | |
| 37 | .text |
| 38 | .align 4 |
| 39 | .globl __reml |
| 40 | .type __reml, @funcnoplt |
| 41 | .usepv __reml, no |
| 42 | |
| 43 | cfi_startproc |
| 44 | cfi_return_column (RA) |
| 45 | __reml: |
| 46 | lda sp, -FRAME(sp) |
| 47 | cfi_def_cfa_offset (FRAME) |
| 48 | CALL_MCOUNT |
| 49 | stt $f0, 0(sp) |
| 50 | excb |
| 51 | beq Y, DIVBYZERO |
| 52 | |
| 53 | stt $f1, 8(sp) |
| 54 | stt $f2, 16(sp) |
| 55 | cfi_rel_offset ($f0, 0) |
| 56 | cfi_rel_offset ($f1, 8) |
| 57 | cfi_rel_offset ($f2, 16) |
| 58 | mf_fpcr $f2 |
| 59 | |
| 60 | EXTEND (X, RV) |
| 61 | EXTEND (Y, AT) |
| 62 | _ITOFT2 RV, $f0, 24, AT, $f1, 32 |
| 63 | cvtqt $f0, $f0 |
| 64 | cvtqt $f1, $f1 |
| 65 | divt/c $f0, $f1, $f0 |
| 66 | cvttq/c $f0, $f0 |
| 67 | excb |
| 68 | mt_fpcr $f2 |
| 69 | _FTOIT $f0, RV, 24 |
| 70 | |
| 71 | ldt $f0, 0(sp) |
| 72 | mull RV, Y, RV |
| 73 | ldt $f1, 8(sp) |
| 74 | ldt $f2, 16(sp) |
| 75 | lda sp, FRAME(sp) |
| 76 | cfi_restore ($f0) |
| 77 | cfi_restore ($f1) |
| 78 | cfi_restore ($f2) |
| 79 | cfi_def_cfa_offset (0) |
| 80 | subl X, RV, RV |
| 81 | ret $31, (RA), 1 |
| 82 | |
| 83 | cfi_endproc |
| 84 | .size __reml, .-__reml |
| 85 | |
| 86 | DO_DIVBYZERO |