| /* truncf function. PowerPC32 version. |
| Copyright (C) 2004, 2006 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, write to the Free |
| Software Foundation, Inc., 1 Franklin Street, Fifth Floor, Boston MA |
| 02110-1301 USA. */ |
| |
| #include <sysdep.h> |
| |
| .section .rodata.cst4,"aM",@progbits,4 |
| .align 2 |
| .LC0: /* 2**23 */ |
| .long 0x4b000000 |
| |
| /* float [fp1] truncf (float 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**23 then |
| subtracting +-2**23. */ |
| |
| .section ".text" |
| ENTRY (__truncf) |
| mffs fp11 /* Save current FPU rounding mode. */ |
| #ifdef SHARED |
| mflr r11 |
| cfi_register(lr,r11) |
| bcl 20,31,1f |
| 1: mflr r9 |
| addis r9,r9,.LC0-1b@ha |
| lfs fp13,.LC0-1b@l(r9) |
| mtlr r11 |
| cfi_same_value (lr) |
| #else |
| lis r9,.LC0@ha |
| lfs fp13,.LC0@l(r9) |
| #endif |
| fabs fp0,fp1 |
| fsubs fp12,fp13,fp13 /* generate 0.0 */ |
| fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ |
| fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ |
| bnllr- cr7 |
| mtfsfi 7,1 /* Set rounding toward 0 mode. */ |
| ble- cr6,.L4 |
| fadds fp1,fp1,fp13 /* x+= TWO23; */ |
| fsubs fp1,fp1,fp13 /* x-= TWO23; */ |
| fabs fp1,fp1 /* if (x == 0.0) */ |
| /* x = 0.0; */ |
| mtfsf 0x01,fp11 /* restore previous rounding mode. */ |
| blr |
| .L4: |
| bge- cr6,.L9 /* if (x < 0.0) */ |
| fsubs fp1,fp1,fp13 /* x-= TWO23; */ |
| fadds fp1,fp1,fp13 /* x+= TWO23; */ |
| fnabs fp1,fp1 /* if (x == 0.0) */ |
| /* x = -0.0; */ |
| .L9: |
| mtfsf 0x01,fp11 /* restore previous rounding mode. */ |
| blr |
| END (__truncf) |
| |
| weak_alias (__truncf, truncf) |
| |
