[3/4] x86-64: Add IEEE 754 exp2f with FMA
Commit Message
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
Add e_exp2f-fma.
(CFLAGS-e_exp2f-fma.c): New.
* sysdeps/x86_64/fpu/multiarch/e_exp2f-fma.c: New file.
* sysdeps/x86_64/fpu/multiarch/e_exp2f.c: Likewise.
---
sysdeps/x86_64/fpu/multiarch/Makefile | 3 ++-
sysdeps/x86_64/fpu/multiarch/e_exp2f-fma.c | 6 ++++++
sysdeps/x86_64/fpu/multiarch/e_exp2f.c | 33 ++++++++++++++++++++++++++++++
3 files changed, 41 insertions(+), 1 deletion(-)
create mode 100644 sysdeps/x86_64/fpu/multiarch/e_exp2f-fma.c
create mode 100644 sysdeps/x86_64/fpu/multiarch/e_exp2f.c
Comments
Please indicate the performance gain from use of FMA.
@@ -37,8 +37,9 @@ CFLAGS-slowpow-fma.c = -mfma -mavx2
CFLAGS-s_sin-fma.c = -mfma -mavx2
CFLAGS-s_tan-fma.c = -mfma -mavx2
-libm-sysdep_routines += e_expf-fma
+libm-sysdep_routines += e_exp2f-fma e_expf-fma
+CFLAGS-e_exp2f-fma.c = -mfma -mavx2
CFLAGS-e_expf-fma.c = -mfma -mavx2
libm-sysdep_routines += e_exp-fma4 e_log-fma4 e_pow-fma4 s_atan-fma4 \
new file mode 100644
@@ -0,0 +1,6 @@
+#undef strong_alias
+#define strong_alias(ignored1, ignored2)
+
+#define __ieee754_exp2f __ieee754_exp2f_fma
+
+#include <sysdeps/ieee754/flt-32/e_exp2f.c>
new file mode 100644
@@ -0,0 +1,33 @@
+/* Multiple versions of IEEE 754 exp2f.
+ Copyright (C) 2017 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/>. */
+
+extern float __redirect_ieee754_exp2f (float);
+
+#define SYMBOL_NAME ieee754_exp2f
+#include "ifunc-fma.h"
+
+libc_ifunc_redirected (__redirect_ieee754_exp2f, __ieee754_exp2f,
+ IFUNC_SELECTOR ());
+strong_alias (__ieee754_exp2f, __exp2f_finite)
+
+#undef strong_alias
+#define strong_alias(ignored1, ignored2)
+
+#define __ieee754_exp2f __ieee754_exp2f_sse2
+
+#include <sysdeps/ieee754/flt-32/e_exp2f.c>