projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f9f70e68 | 1 | /* truncf function. PowerPC32 version. |
| d4697bc9 | 2 | Copyright (C) 2004-2014 Free Software Foundation, Inc. |
| f9f70e68 UD |
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 | |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| f9f70e68 UD |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | ||
| 4d37c8aa | 21 | .section .rodata.cst4,"aM",@progbits,4 |
| 99c7f870 | 22 | .align 2 |
| f9f70e68 | 23 | .LC0: /* 2**23 */ |
| 4d37c8aa | 24 | .long 0x4b000000 |
| f9f70e68 UD |
25 | |
| 26 | /* float [fp1] truncf (float x [fp1]) | |
| 27 | IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer | |
| 9c84384c | 28 | value, in floating format, nearest to but no larger in magnitude |
| f9f70e68 UD |
29 | then the argument." |
| 30 | We set "round toward Zero" mode and trunc by adding +-2**23 then | |
| 31 | subtracting +-2**23. */ | |
| 32 | ||
| f7d78e18 | 33 | .section ".text" |
| f9f70e68 UD |
34 | ENTRY (__truncf) |
| 35 | mffs fp11 /* Save current FPU rounding mode. */ | |
| 36 | #ifdef SHARED | |
| 37 | mflr r11 | |
| a7e91561 | 38 | cfi_register(lr,r11) |
| 91d2a845 WS |
39 | SETUP_GOT_ACCESS(r9,got_label) |
| 40 | addis r9,r9,.LC0-got_label@ha | |
| 41 | lfs fp13,.LC0-got_label@l(r9) | |
| a7e91561 UD |
42 | mtlr r11 |
| 43 | cfi_same_value (lr) | |
| f9f70e68 UD |
44 | #else |
| 45 | lis r9,.LC0@ha | |
| 4d37c8aa | 46 | lfs fp13,.LC0@l(r9) |
| f9f70e68 UD |
47 | #endif |
| 48 | fabs fp0,fp1 | |
| 49 | fsubs fp12,fp13,fp13 /* generate 0.0 */ | |
| 50 | fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ | |
| 51 | fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ | |
| 52 | bnllr- cr7 | |
| 53 | mtfsfi 7,1 /* Set rounding toward 0 mode. */ | |
| 54 | ble- cr6,.L4 | |
| 55 | fadds fp1,fp1,fp13 /* x+= TWO23; */ | |
| 56 | fsubs fp1,fp1,fp13 /* x-= TWO23; */ | |
| 4d37c8aa UD |
57 | fabs fp1,fp1 /* if (x == 0.0) */ |
| 58 | /* x = 0.0; */ | |
| f964490f | 59 | mtfsf 0x01,fp11 /* restore previous rounding mode. */ |
| f9f70e68 UD |
60 | blr |
| 61 | .L4: | |
| 62 | bge- cr6,.L9 /* if (x < 0.0) */ | |
| 63 | fsubs fp1,fp1,fp13 /* x-= TWO23; */ | |
| 64 | fadds fp1,fp1,fp13 /* x+= TWO23; */ | |
| 4d37c8aa UD |
65 | fnabs fp1,fp1 /* if (x == 0.0) */ |
| 66 | /* x = -0.0; */ | |
| 67 | .L9: | |
| f9f70e68 | 68 | mtfsf 0x01,fp11 /* restore previous rounding mode. */ |
| f9f70e68 UD |
69 | blr |
| 70 | END (__truncf) | |
| 71 | ||
| 72 | weak_alias (__truncf, truncf) | |
| 73 |