| /* trunc function. PowerPC64 version. |
| Copyright (C) 2004-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <math_ldbl_opt.h> |
| #include <libm-alias-double.h> |
| |
| .section ".toc","aw" |
| .LC0: /* 2**52 */ |
| .tc FD_43300000_0[TC],0x4330000000000000 |
| .section ".text" |
| |
| /* double [fp1] trunc (double x [fp1]) |
| IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer |
| value, in floating format, nearest to but no larger in magnitude |
| then the argument." |
| We set "round toward Zero" mode and trunc by adding +-2**52 then |
| subtracting +-2**52. */ |
| |
| ENTRY (__trunc, 4) |
| CALL_MCOUNT 0 |
| lfd fp13,.LC0@toc(2) |
| fabs fp0,fp1 |
| fsub fp12,fp13,fp13 /* generate 0.0 */ |
| fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ |
| mffs fp11 /* Save current FPU rounding mode and |
| "inexact" state. */ |
| fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ |
| bnl- cr7,.L10 |
| mtfsfi 7,1 /* Set rounding toward 0 mode. */ |
| ble- cr6,.L4 |
| fadd fp1,fp1,fp13 /* x+= TWO52; */ |
| fsub fp1,fp1,fp13 /* x-= TWO52; */ |
| fabs fp1,fp1 /* if (x == 0.0) */ |
| /* x = 0.0; */ |
| mtfsf 0xff,fp11 /* Restore previous rounding mode and |
| "inexact" state. */ |
| blr |
| .L4: |
| bge- cr6,.L9 /* if (x < 0.0) */ |
| fsub fp1,fp1,fp13 /* x-= TWO52; */ |
| fadd fp1,fp1,fp13 /* x+= TWO52; */ |
| fnabs fp1,fp1 /* if (x == 0.0) */ |
| /* x = -0.0; */ |
| .L9: |
| mtfsf 0xff,fp11 /* Restore previous rounding mode and |
| "inexact" state. */ |
| blr |
| .L10: |
| /* Ensure sNaN input is converted to qNaN. */ |
| fcmpu cr7,fp1,fp1 |
| beqlr cr7 |
| fadd fp1,fp1,fp1 |
| blr |
| END (__trunc) |
| |
| libm_alias_double (__trunc, trunc) |
