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433a2ba68c
This patch implements the s390 specific math barriers in order to omit the store and load from stack if possible.
47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* 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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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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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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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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#ifndef S390_MATH_BARRIERS_H
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#define S390_MATH_BARRIERS_H 1
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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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#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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#endif
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