mirror of git://gcc.gnu.org/git/gcc.git
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* go-cdiv.c -- complex division routines
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Copyright 2013 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include <complex.h>
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#include <math.h>
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/* Calls to these functions are generated by the Go frontend for
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division of complex64 or complex128. We use these because Go's
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complex division expects slightly different results from the GCC
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default. When dividing NaN+1.0i / 0+0i, Go expects NaN+NaNi but
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GCC generates NaN+Infi. NaN+Infi seems wrong seems the rules of
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C99 Annex G specify that if either side of a complex number is Inf,
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the the whole number is Inf, but an operation involving NaN ought
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to result in NaN, not Inf. */
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complex float
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__go_complex64_div (complex float a, complex float b)
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{
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if (__builtin_expect (b == 0, 0))
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{
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if (!isinf (crealf (a))
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&& !isinf (cimagf (a))
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&& (isnan (crealf (a)) || isnan (cimagf (a))))
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{
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/* Pass "1" to nanf to match math/bits.go. */
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return nanf("1") + nanf("1")*I;
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}
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}
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return a / b;
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}
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complex double
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__go_complex128_div (complex double a, complex double b)
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{
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if (__builtin_expect (b == 0, 0))
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{
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if (!isinf (creal (a))
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&& !isinf (cimag (a))
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&& (isnan (creal (a)) || isnan (cimag (a))))
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{
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/* Pass "1" to nan to match math/bits.go. */
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return nan("1") + nan("1")*I;
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}
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}
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return a / b;
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}
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