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authorJoseph Myers <joseph@codesourcery.com>2018-05-09 00:15:10 +0000
committerJoseph Myers <joseph@codesourcery.com>2018-05-09 00:15:10 +0000
commitaaee3cd88ed58f332f261021d78d071db6265e85 (patch)
tree3254deb770eb255134f227e145a7716d3e6c56d2 /include
parent0555c47719d1f75b0fb378f0578367a8ea112d29 (diff)
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Move math_narrow_eval to separate math-narrow-eval.h.
This patch continues cleaning up the math_private.h header, which contains lots of different definitions many of which are only needed by a limited subset of files using that header (and some of which are overridden by architectures that only want to override selected parts of the header), by moving the math_narrow_eval macro out to a separate math-narrow-eval.h header, only included by those files that need it. That header is placed in include/ (since it's used in stdlib/, not just files built in math/, but no sysdeps variants are needed at present). Tested for x86_64, and with build-many-glibcs.py. (Installed stripped shared libraries change because of line numbers in assertions in strtod_l.c.) * include/math-narrow-eval.h: New file. Contents moved from .... * sysdeps/generic/math_private.h: ... here. (math_narrow_eval): Remove macro. Moved to math-narrow-eval.h. [FLT_EVAL_METHOD != 0] (excess_precision): Likewise. * math/s_fdim_template.c: Include <math-narrow-eval.h>. * stdlib/strtod_l.c: Likewise. * sysdeps/i386/fpu/s_f32xaddf64.c: Likewise. * sysdeps/i386/fpu/s_f32xsubf64.c: Likewise. * sysdeps/i386/fpu/s_fdim.c: Likewise. * sysdeps/ieee754/dbl-64/e_cosh.c: Likewise. * sysdeps/ieee754/dbl-64/e_gamma_r.c: Likewise. * sysdeps/ieee754/dbl-64/e_j1.c: Likewise. * sysdeps/ieee754/dbl-64/e_jn.c: Likewise. * sysdeps/ieee754/dbl-64/e_lgamma_r.c: Likewise. * sysdeps/ieee754/dbl-64/e_sinh.c: Likewise. * sysdeps/ieee754/dbl-64/gamma_productf.c: Likewise. * sysdeps/ieee754/dbl-64/k_rem_pio2.c: Likewise. * sysdeps/ieee754/dbl-64/lgamma_neg.c: Likewise. * sysdeps/ieee754/dbl-64/s_erf.c: Likewise. * sysdeps/ieee754/dbl-64/s_llrint.c: Likewise. * sysdeps/ieee754/dbl-64/s_lrint.c: Likewise. * sysdeps/ieee754/flt-32/e_coshf.c: Likewise. * sysdeps/ieee754/flt-32/e_exp2f.c: Likewise. * sysdeps/ieee754/flt-32/e_expf.c: Likewise. * sysdeps/ieee754/flt-32/e_gammaf_r.c: Likewise. * sysdeps/ieee754/flt-32/e_j1f.c: Likewise. * sysdeps/ieee754/flt-32/e_jnf.c: Likewise. * sysdeps/ieee754/flt-32/e_lgammaf_r.c: Likewise. * sysdeps/ieee754/flt-32/e_sinhf.c: Likewise. * sysdeps/ieee754/flt-32/k_rem_pio2f.c: Likewise. * sysdeps/ieee754/flt-32/lgamma_negf.c: Likewise. * sysdeps/ieee754/flt-32/s_erff.c: Likewise. * sysdeps/ieee754/flt-32/s_llrintf.c: Likewise. * sysdeps/ieee754/flt-32/s_lrintf.c: Likewise. * sysdeps/ieee754/ldbl-96/gamma_product.c: Likewise.
Diffstat (limited to 'include')
-rw-r--r--include/math-narrow-eval.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/include/math-narrow-eval.h b/include/math-narrow-eval.h
new file mode 100644
index 0000000000..4361aa06c0
--- /dev/null
+++ b/include/math-narrow-eval.h
@@ -0,0 +1,47 @@
+/* Narrow floating-point values to their semantic type.
+ Copyright (C) 2015-2018 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/>. */
+
+#ifndef _MATH_NARROW_EVAL_H
+#define _MATH_NARROW_EVAL_H 1
+
+#include <float.h>
+
+/* math_narrow_eval reduces its floating-point argument to the range
+ and precision of its semantic type. (The original evaluation may
+ still occur with excess range and precision, so the result may be
+ affected by double rounding.) */
+#if FLT_EVAL_METHOD == 0
+# define math_narrow_eval(x) (x)
+#else
+# if FLT_EVAL_METHOD == 1
+# define excess_precision(type) __builtin_types_compatible_p (type, float)
+# else
+# define excess_precision(type) (__builtin_types_compatible_p (type, float) \
+ || __builtin_types_compatible_p (type, \
+ double))
+# endif
+# define math_narrow_eval(x) \
+ ({ \
+ __typeof (x) math_narrow_eval_tmp = (x); \
+ if (excess_precision (__typeof (math_narrow_eval_tmp))) \
+ __asm__ ("" : "+m" (math_narrow_eval_tmp)); \
+ math_narrow_eval_tmp; \
+ })
+#endif
+
+#endif /* math-narrow-eval.h */