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authorAdhemerval Zanella <azanella@linux.vnet.ibm.com>2014-02-17 10:44:08 -0600
committerAdhemerval Zanella <azanella@linux.vnet.ibm.com>2014-02-27 12:58:33 -0600
commitfe13a20c37578f08ce393ccaeb45caeb48815ca5 (patch)
tree62a09dac1baf2a1caf2e8b346733645cc596340f /sysdeps/powerpc/powerpc64/power8
parent1ad8950a3ea4056ed343d681b5146f4b4aa27e10 (diff)
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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.S47
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 0000000000..b00d4d616f
--- /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