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