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GNU C Library master sources branch ibm/2.24/master updated. glibc-2.24-19-g0271fac
- From: tuliom at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 21 Oct 2016 18:21:47 -0000
- Subject: GNU C Library master sources branch ibm/2.24/master updated. glibc-2.24-19-g0271fac
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=0271fac6ade279ccb3f5201443f0a48aff7bed53
commit 0271fac6ade279ccb3f5201443f0a48aff7bed53
Author: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Date: Tue Oct 18 15:30:23 2016 -0200
powerpc: Add a POWER8 implementation for GET|SET_FLOAT_WORD
Provides a POWER8 implementation for GET_FLOAT_WORD and SET_FLOAT_WORD
that is able to extract or set a float using only VSR and GPR.
This is a workaround for GCC bug #70568.
diff --git a/ChangeLog b/ChangeLog
index b0c1d93..7a68f49 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-10-18 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.
+
2016-09-19 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
[BZ #20615]
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..fe00c73
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power8/fpu/math_private.h
@@ -0,0 +1,49 @@
+/* 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/>. */
+
+/* The compiler isn't extracting this without going through memory, so
+ we use some VSX scalar instructions to convert to the 32b format
+ and move to a GPR. */
+#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)
+
+/* To ensure that we don't go through memory, we use some VSX scalar
+ instructions to move VSR and to convert to the 32b format. */
+#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>
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 5 ++
.../powerpc/powerpc64/power8/fpu/math_private.h | 49 ++++++++++++++++++++
2 files changed, 54 insertions(+), 0 deletions(-)
create mode 100644 sysdeps/powerpc/powerpc64/power8/fpu/math_private.h
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