projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 7adcbafe | 1 | /* Copyright (C) 1989-2022 Free Software Foundation, Inc. |
| 661eb8f9 MM |
2 | |
| 3 | This file is part of GCC. | |
| 4 | ||
| 5 | GCC is free software; you can redistribute it and/or modify it under | |
| 6 | the terms of the GNU General Public License as published by the Free | |
| 7 | Software Foundation; either version 3, or (at your option) any later | |
| 8 | version. | |
| 9 | ||
| 10 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 12 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 13 | for more details. | |
| 14 | ||
| 15 | Under Section 7 of GPL version 3, you are granted additional | |
| 16 | permissions described in the GCC Runtime Library Exception, version | |
| 17 | 3.1, as published by the Free Software Foundation. | |
| 18 | ||
| 19 | You should have received a copy of the GNU General Public License and | |
| 20 | a copy of the GCC Runtime Library Exception along with this program; | |
| 21 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 22 | <http://www.gnu.org/licenses/>. */ | |
| 23 | ||
| 24 | #include "soft-fp.h" | |
| 25 | #include "quad-float128.h" | |
| 26 | ||
| 27 | /* __powikf3 can be compiled 3 different ways: | |
| 28 | ||
| 29 | 1) If the assembler does not have support for the IEEE 128-bit insns | |
| 30 | (xsaddqp, etc.) it is just compiled as __powikf2. | |
| 31 | ||
| 32 | 2) If the assembler has IEEE 128-bit floating point support, and __powikf2 | |
| 33 | is not previously defined, it is defined as __powikf2_sw. | |
| 34 | ||
| 35 | 3) If the assembler has IEEE 128-bit floating point support, and __powikf2 | |
| 36 | is included by _powikf2-hw.c, which defines __powikf2 as __powikf2_hw. The | |
| 37 | __powikf2_hw.c is compiled with -mcpu=power9 and it automatically uses the | |
| 38 | IEEE 128-bit instructions. | |
| 39 | ||
| 40 | For #2/#3, float128-ifunc.c defines an ifunc function for __powikf2, that | |
| 41 | will use the software version on power7/power8 systems, and the hardware | |
| 42 | version on power9 systems. | |
| 43 | ||
| 44 | The code is cloned from the code in libgcc2.c (which handles the standard | |
| 45 | SF, DF, TF, and XF types). */ | |
| 46 | ||
| 47 | #if defined(FLOAT128_HW_INSNS) && !defined(__powikf2) | |
| 48 | #define __powikf2 __powikf2_sw | |
| 49 | #endif | |
| 50 | ||
| 51 | TFtype | |
| 52 | __powikf2 (TFtype x, SItype_ppc m) | |
| 53 | { | |
| 54 | unsigned int n = m < 0 ? -m : m; | |
| 55 | TFtype y = n % 2 ? x : 1; | |
| 56 | while (n >>= 1) | |
| 57 | { | |
| 58 | x = x * x; | |
| 59 | if (n % 2) | |
| 60 | y = y * x; | |
| 61 | } | |
| 62 | return m < 0 ? 1/y : y; | |
| 63 | } |