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[PATCH] powerpc: Add a POWER8 implementation for GET|SET_FLOAT_WORD
- From: "Tulio Magno Quites Machado Filho" <tuliom at linux dot vnet dot ibm dot com>
- To: libc-alpha at sourceware dot org
- Date: Tue, 20 Dec 2016 16:33:44 -0200
- Subject: [PATCH] powerpc: Add a POWER8 implementation for GET|SET_FLOAT_WORD
- Authentication-results: sourceware.org; auth=none
Provides a POWER8-specific implementation for GET_FLOAT_WORD and
SET_FLOAT_WORD that is able to extract or set a float using only VSR and
GPR.
2016-12-20 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/power8/fpu/math_private.h (GET_FLOAT_WORD):
(SET_FLOAT_WORD): New macros.
---
.../powerpc/powerpc64/power8/fpu/math_private.h | 48 ++++++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100644 sysdeps/powerpc/powerpc64/power8/fpu/math_private.h
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/math_private.h b/sysdeps/powerpc/powerpc64/power8/fpu/math_private.h
new file mode 100644
index 0000000..74fa4c6
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power8/fpu/math_private.h
@@ -0,0 +1,48 @@
+/* Private inline math functions for POWER8.
+ Copyright (C) 2016 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/>. */
+
+/* Move a float to a GPR using VSX instructions available in the POWER
+ ISA 2.07. */
+#define GET_FLOAT_WORD(i,d) \
+ do { \
+ float tmpd = d; \
+ double tmp; \
+ long tmpi; \
+ __asm__ ("xscvdpspn %x1, %x2\n\t" \
+ "mfvsrd %0, %x1\n\t" \
+ : "=wr" (tmpi), \
+ "=wa" (tmp) \
+ : "wa" (tmpd) ); \
+ i = tmpi >> 32; \
+ } while(0)
+
+/* Move a float from GPR using VSX instructions available in the POWER
+ ISA 2.07. */
+#define SET_FLOAT_WORD(d,i) \
+ do { \
+ long tmpi = i; \
+ float tmpd; \
+ tmpi = tmpi << 32; \
+ __asm__ ("mtvsrd %x0, %1\n\t" \
+ "xscvspdpn %x0, %x0\n\t" \
+ : "=wa" (tmpd) \
+ : "wr" (tmpi) ); \
+ d = tmpd; \
+ } while(0)
+
+#include_next <math_private.h>
--
2.1.0