projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5ce98c3f | 1 | /* truncf function. PowerPC64 version. |
| 04277e02 | 2 | Copyright (C) 2004-2019 Free Software Foundation, Inc. |
| 5ce98c3f 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/>. */ | |
| 5ce98c3f UD |
18 | |
| 19 | #include <sysdep.h> | |
| 216933b2 | 20 | #include <libm-alias-float.h> |
| 5ce98c3f UD |
21 | |
| 22 | .section ".toc","aw" | |
| 76a66d51 | 23 | .p2align 3 |
| 5ce98c3f | 24 | .LC0: /* 2**23 */ |
| 76a66d51 AB |
25 | .long 0x4b000000 |
| 26 | .long 0x0 | |
| 5ce98c3f | 27 | .section ".text" |
| 9c84384c | 28 | |
| 5ce98c3f UD |
29 | /* float [fp1] truncf (float x [fp1]) |
| 30 | IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer | |
| 9c84384c | 31 | value, in floating format, nearest to but no larger in magnitude |
| 5ce98c3f UD |
32 | then the argument." |
| 33 | We set "round toward Zero" mode and trunc by adding +-2**23 then | |
| 34 | subtracting +-2**23. */ | |
| 35 | ||
| d5b41185 | 36 | ENTRY (__truncf, 4) |
| d7d06f79 | 37 | CALL_MCOUNT 0 |
| 4d37c8aa | 38 | lfs fp13,.LC0@toc(2) |
| 5ce98c3f UD |
39 | fabs fp0,fp1 |
| 40 | fsubs fp12,fp13,fp13 /* generate 0.0 */ | |
| 41 | fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ | |
| b4d80349 JM |
42 | mffs fp11 /* Save current FPU rounding mode and |
| 43 | "inexact" state. */ | |
| 5ce98c3f | 44 | fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ |
| f6ef0657 | 45 | bnl- cr7,.L10 |
| 5ce98c3f UD |
46 | mtfsfi 7,1 /* Set rounding toward 0 mode. */ |
| 47 | ble- cr6,.L4 | |
| 48 | fadds fp1,fp1,fp13 /* x+= TWO23; */ | |
| 49 | fsubs fp1,fp1,fp13 /* x-= TWO23; */ | |
| 4d37c8aa UD |
50 | fabs fp1,fp1 /* if (x == 0.0) */ |
| 51 | /* x = 0.0; */ | |
| b4d80349 JM |
52 | mtfsf 0xff,fp11 /* Restore previous rounding mode and |
| 53 | "inexact" state. */ | |
| 5ce98c3f UD |
54 | blr |
| 55 | .L4: | |
| 56 | bge- cr6,.L9 /* if (x < 0.0) */ | |
| 57 | fsubs fp1,fp1,fp13 /* x-= TWO23; */ | |
| 58 | fadds fp1,fp1,fp13 /* x+= TWO23; */ | |
| 4d37c8aa UD |
59 | fnabs fp1,fp1 /* if (x == 0.0) */ |
| 60 | /* x = -0.0; */ | |
| 61 | .L9: | |
| b4d80349 JM |
62 | mtfsf 0xff,fp11 /* Restore previous rounding mode and |
| 63 | "inexact" state. */ | |
| 5ce98c3f | 64 | blr |
| f6ef0657 JM |
65 | .L10: |
| 66 | /* Ensure sNaN input is converted to qNaN. */ | |
| 67 | fcmpu cr7,fp1,fp1 | |
| 68 | beqlr cr7 | |
| 69 | fadds fp1,fp1,fp1 | |
| 70 | blr | |
| 5ce98c3f UD |
71 | END (__truncf) |
| 72 | ||
| 216933b2 | 73 | libm_alias_float (__trunc, trunc) |
| 5ce98c3f | 74 |