| 1 | /* Copyright (C) 2004-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include "div_libc.h" |
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| 19 | |
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| 20 | /* 32-bit signed int remainder. This is not a normal C function. Argument |
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| 21 | registers are t10 and t11, the result goes in t12. Only t12 and AT may |
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| 22 | be clobbered. |
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| 23 | |
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| 24 | The FPU can handle the division for all input values except zero. |
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| 25 | All we have to do is compute the remainder via multiply-and-subtract. |
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| 26 | |
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| 27 | The FPCR save/restore is due to the fact that the EV6 _will_ set FPCR_INE |
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| 28 | for cvttq/c even without /sui being set. It will not, however, properly |
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| 29 | raise the exception, so we don't have to worry about FPCR_INED being clear |
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| 30 | and so dying by SIGFPE. */ |
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| 31 | |
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| 32 | #ifndef EXTEND |
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| 33 | #define EXTEND(S,D) sextl S, D |
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| 34 | #endif |
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| 35 | |
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| 36 | .text |
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| 37 | .align 4 |
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| 38 | .globl __reml |
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| 39 | .type __reml, @funcnoplt |
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| 40 | .usepv __reml, no |
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| 41 | |
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| 42 | cfi_startproc |
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| 43 | cfi_return_column (RA) |
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| 44 | __reml: |
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| 45 | lda sp, -FRAME(sp) |
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| 46 | cfi_def_cfa_offset (FRAME) |
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| 47 | CALL_MCOUNT |
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| 48 | stt $f0, 0(sp) |
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| 49 | excb |
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| 50 | beq Y, DIVBYZERO |
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| 51 | |
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| 52 | stt $f1, 8(sp) |
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| 53 | stt $f2, 16(sp) |
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| 54 | cfi_rel_offset ($f0, 0) |
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| 55 | cfi_rel_offset ($f1, 8) |
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| 56 | cfi_rel_offset ($f2, 16) |
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| 57 | mf_fpcr $f2 |
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| 58 | |
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| 59 | EXTEND (X, RV) |
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| 60 | EXTEND (Y, AT) |
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| 61 | _ITOFT2 RV, $f0, 24, AT, $f1, 32 |
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| 62 | cvtqt $f0, $f0 |
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| 63 | cvtqt $f1, $f1 |
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| 64 | divt/c $f0, $f1, $f0 |
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| 65 | cvttq/c $f0, $f0 |
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| 66 | excb |
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| 67 | mt_fpcr $f2 |
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| 68 | _FTOIT $f0, RV, 24 |
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| 69 | |
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| 70 | ldt $f0, 0(sp) |
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| 71 | mull RV, Y, RV |
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| 72 | ldt $f1, 8(sp) |
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| 73 | ldt $f2, 16(sp) |
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| 74 | lda sp, FRAME(sp) |
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| 75 | cfi_restore ($f0) |
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| 76 | cfi_restore ($f1) |
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| 77 | cfi_restore ($f2) |
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| 78 | cfi_def_cfa_offset (0) |
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| 79 | subl X, RV, RV |
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| 80 | ret $31, (RA), 1 |
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| 81 | |
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| 82 | cfi_endproc |
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| 83 | .size __reml, .-__reml |
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| 84 | |
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| 85 | DO_DIVBYZERO |
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| 86 | |
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