projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5ce98c3f | 1 | /* trunc function. PowerPC64 version. |
| f7a9f785 | 2 | Copyright (C) 2004-2016 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> | |
| f964490f | 20 | #include <math_ldbl_opt.h> |
| 5ce98c3f UD |
21 | |
| 22 | .section ".toc","aw" | |
| 23 | .LC0: /* 2**52 */ | |
| 24 | .tc FD_43300000_0[TC],0x4330000000000000 | |
| 5ce98c3f | 25 | .section ".text" |
| 9c84384c | 26 | |
| 5ce98c3f UD |
27 | /* double [fp1] trunc (double x [fp1]) |
| 28 | IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer | |
| 9c84384c | 29 | value, in floating format, nearest to but no larger in magnitude |
| 5ce98c3f UD |
30 | then the argument." |
| 31 | We set "round toward Zero" mode and trunc by adding +-2**52 then | |
| 32 | subtracting +-2**52. */ | |
| 33 | ||
| 4d37c8aa | 34 | EALIGN (__trunc, 4, 0) |
| d7d06f79 | 35 | CALL_MCOUNT 0 |
| 5ce98c3f UD |
36 | mffs fp11 /* Save current FPU rounding mode. */ |
| 37 | lfd fp13,.LC0@toc(2) | |
| 38 | fabs fp0,fp1 | |
| 39 | fsub fp12,fp13,fp13 /* generate 0.0 */ | |
| 40 | fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ | |
| 41 | fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ | |
| 42 | bnllr- cr7 | |
| 43 | mtfsfi 7,1 /* Set rounding toward 0 mode. */ | |
| 44 | ble- cr6,.L4 | |
| 45 | fadd fp1,fp1,fp13 /* x+= TWO52; */ | |
| 46 | fsub fp1,fp1,fp13 /* x-= TWO52; */ | |
| 4d37c8aa UD |
47 | fabs fp1,fp1 /* if (x == 0.0) */ |
| 48 | /* x = 0.0; */ | |
| f964490f | 49 | mtfsf 0x01,fp11 /* restore previous rounding mode. */ |
| 5ce98c3f UD |
50 | blr |
| 51 | .L4: | |
| 52 | bge- cr6,.L9 /* if (x < 0.0) */ | |
| 53 | fsub fp1,fp1,fp13 /* x-= TWO52; */ | |
| 54 | fadd fp1,fp1,fp13 /* x+= TWO52; */ | |
| 4d37c8aa UD |
55 | fnabs fp1,fp1 /* if (x == 0.0) */ |
| 56 | /* x = -0.0; */ | |
| 57 | .L9: | |
| 5ce98c3f | 58 | mtfsf 0x01,fp11 /* restore previous rounding mode. */ |
| 5ce98c3f UD |
59 | blr |
| 60 | END (__trunc) | |
| 61 | ||
| 62 | weak_alias (__trunc, trunc) | |
| 63 | ||
| 64 | #ifdef NO_LONG_DOUBLE | |
| 65 | weak_alias (__trunc, truncl) | |
| 66 | strong_alias (__trunc, __truncl) | |
| 67 | #endif | |
| f964490f RM |
68 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) |
| 69 | compat_symbol (libm, __trunc, truncl, GLIBC_2_1) | |
| 70 | #endif |