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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-02-17 10:44:08 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-02-27 12:58:33 -0600 |
| commit | fe13a20c37578f08ce393ccaeb45caeb48815ca5 (patch) | |
| tree | 62a09dac1baf2a1caf2e8b346733645cc596340f /sysdeps/powerpc/powerpc64/power8 | |
| parent | 1ad8950a3ea4056ed343d681b5146f4b4aa27e10 (diff) | |
| download | glibc-fe13a20c37578f08ce393ccaeb45caeb48815ca5.zip glibc-fe13a20c37578f08ce393ccaeb45caeb48815ca5.tar.gz glibc-fe13a20c37578f08ce393ccaeb45caeb48815ca5.tar.bz2 | |
PowerPC: llround/llroundf POWER8 optimization
This patch add a optimized llround/llroundf implementation for POWER8
using the new Move From VSR Doubleword instruction to gains some
cycles from FP to GRP register move.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power8')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S new file mode 100644 index 0000000..b00d4d6 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S @@ -0,0 +1,47 @@ +/* llround function. POWER8 PowerPC64 version. + Copyright (C) 2014 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> + +#define MFVSRD_R3_V1 .byte 0x7c,0x23,0x00,0x66 /* mfvsrd r3,vs1 */ + +/* long long [r3] llround (float x [fp1]) */ + +ENTRY (__llround) + CALL_MCOUNT 0 + frin fp1,fp1 /* Round to nearest +-0.5. */ + fctidz fp1,fp1 /* Convert To Integer DW round toward 0. */ + MFVSRD_R3_V1 + blr +END (__llround) + +strong_alias (__llround, __lround) +weak_alias (__llround, llround) +weak_alias (__lround, lround) + +#ifdef NO_LONG_DOUBLE +weak_alias (__llround, llroundl) +strong_alias (__llround, __llroundl) +weak_alias (__lround, lroundl) +strong_alias (__lround, __lroundl) +#endif +#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) +compat_symbol (libm, __llround, llroundl, GLIBC_2_1) +compat_symbol (libm, __lround, lroundl, GLIBC_2_1) +#endif |