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From 33f3c934e3023b85c3774ee0482ec4da2a10a3b5 Mon Sep 17 00:00:00 2001
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From: Stefan Liebler <stli@linux.ibm.com>
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Date: Wed, 11 Dec 2019 15:09:32 +0100
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Subject: [PATCH 24/28] S390: Implement math-barriers math_opt_barrier and
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math_force_eval.
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This patch implements the s390 specific math barriers in order
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to omit the store and load from stack if possible.
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(cherry picked from commit 433a2ba68cd91842546e0f0d43d65835634d570d)
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---
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sysdeps/s390/fpu/math-barriers.h | 46 ++++++++++++++++++++++++++++++++
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1 file changed, 46 insertions(+)
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create mode 100644 sysdeps/s390/fpu/math-barriers.h
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diff --git a/sysdeps/s390/fpu/math-barriers.h b/sysdeps/s390/fpu/math-barriers.h
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new file mode 100644
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index 0000000000..7c3e6b15e0
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--- /dev/null
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+++ b/sysdeps/s390/fpu/math-barriers.h
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@@ -0,0 +1,46 @@
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+/* Control when floating-point expressions are evaluated. s390 version.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef S390_MATH_BARRIERS_H
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+#define S390_MATH_BARRIERS_H 1
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+
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+#ifdef HAVE_S390_VX_GCC_SUPPORT
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+# define ASM_CONSTRAINT_VR "v"
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+#else
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+# define ASM_CONSTRAINT_VR
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+#endif
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+
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+#define math_opt_barrier(x) \
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+ ({ __typeof (x) __x = (x); \
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+ if (__builtin_types_compatible_p (__typeof (x), _Float128)) \
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+ __asm__ ("# math_opt_barrier_f128 %0" : "+fm" (__x)); \
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+ else \
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+ __asm__ ("# math_opt_barrier %0" \
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+ : "+f" ASM_CONSTRAINT_VR "m" (__x)); \
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+ __x; })
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+#define math_force_eval(x) \
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+ ({ __typeof (x) __x = (x); \
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+ if (__builtin_types_compatible_p (__typeof (x), _Float128)) \
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+ __asm__ __volatile__ ("# math_force_eval_f128 %0" \
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+ : : "fm" (__x)); \
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+ else \
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+ __asm__ __volatile__ ("# math_force_eval %0" \
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+ : : "f" ASM_CONSTRAINT_VR "m" (__x)); \
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+ })
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+
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+#endif
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--
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2.18.2
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