projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f9f70e68 | 1 | /* trunc function. PowerPC32 version. |
| 04277e02 | 2 | Copyright (C) 2004-2019 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> | |
| f964490f | 20 | #include <math_ldbl_opt.h> |
| 51ea3b20 | 21 | #include <libm-alias-double.h> |
| f9f70e68 | 22 | |
| b0e196a4 UD |
23 | .section .rodata.cst4,"aM",@progbits,4 |
| 24 | .align 2 | |
| f9f70e68 | 25 | .LC0: /* 2**52 */ |
| b0e196a4 | 26 | .long 0x59800000 |
| f9f70e68 UD |
27 | |
| 28 | /* double [fp1] trunc (double x [fp1]) | |
| 29 | IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer | |
| 9c84384c | 30 | value, in floating format, nearest to but no larger in magnitude |
| f9f70e68 UD |
31 | then the argument." |
| 32 | We set "round toward Zero" mode and trunc by adding +-2**52 then | |
| 33 | subtracting +-2**52. */ | |
| 34 | ||
| f7d78e18 | 35 | .section ".text" |
| f9f70e68 | 36 | ENTRY (__trunc) |
| f9f70e68 UD |
37 | #ifdef SHARED |
| 38 | mflr r11 | |
| a7e91561 | 39 | cfi_register(lr,r11) |
| 91d2a845 WS |
40 | SETUP_GOT_ACCESS(r9,got_label) |
| 41 | addis r9,r9,.LC0-got_label@ha | |
| 42 | lfs fp13,.LC0-got_label@l(r9) | |
| a7e91561 UD |
43 | mtlr r11 |
| 44 | cfi_same_value (lr) | |
| f9f70e68 UD |
45 | #else |
| 46 | lis r9,.LC0@ha | |
| b0e196a4 | 47 | lfs fp13,.LC0@l(r9) |
| f9f70e68 UD |
48 | #endif |
| 49 | fabs fp0,fp1 | |
| 50 | fsub fp12,fp13,fp13 /* generate 0.0 */ | |
| 51 | fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ | |
| 1f921a93 JM |
52 | mffs fp11 /* Save current FPU rounding mode and |
| 53 | "inexact" state. */ | |
| f9f70e68 | 54 | fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ |
| debf7618 | 55 | bnl- cr7,.L10 |
| f9f70e68 UD |
56 | mtfsfi 7,1 /* Set rounding toward 0 mode. */ |
| 57 | ble- cr6,.L4 | |
| 58 | fadd fp1,fp1,fp13 /* x+= TWO52; */ | |
| 59 | fsub fp1,fp1,fp13 /* x-= TWO52; */ | |
| 4d37c8aa UD |
60 | fabs fp1,fp1 /* if (x == 0.0) */ |
| 61 | /* x = 0.0; */ | |
| 1f921a93 JM |
62 | mtfsf 0xff,fp11 /* Restore previous rounding mode and |
| 63 | "inexact" state. */ | |
| f9f70e68 UD |
64 | blr |
| 65 | .L4: | |
| 66 | bge- cr6,.L9 /* if (x < 0.0) */ | |
| 67 | fsub fp1,fp1,fp13 /* x-= TWO52; */ | |
| 68 | fadd fp1,fp1,fp13 /* x+= TWO52; */ | |
| 4d37c8aa UD |
69 | fnabs fp1,fp1 /* if (x == 0.0) */ |
| 70 | /* x = -0.0; */ | |
| 71 | .L9: | |
| 1f921a93 JM |
72 | mtfsf 0xff,fp11 /* Restore previous rounding mode and |
| 73 | "inexact" state. */ | |
| f9f70e68 | 74 | blr |
| debf7618 JM |
75 | .L10: |
| 76 | /* Ensure sNaN input is converted to qNaN. */ | |
| 77 | fcmpu cr7,fp1,fp1 | |
| 78 | beqlr cr7 | |
| 79 | fadd fp1,fp1,fp1 | |
| 80 | blr | |
| f9f70e68 UD |
81 | END (__trunc) |
| 82 | ||
| 51ea3b20 | 83 | libm_alias_double (__trunc, trunc) |