7a9389330e
gcc/: * gcc.c (default_compilers): Add entry for ".go". * common.opt: Add -static-libgo as a driver option. * doc/install.texi (Configuration): Mention libgo as an option for --enable-shared. Mention go as an option for --enable-languages. * doc/invoke.texi (Overall Options): Mention .go as a file name suffix. Mention go as a -x option. * doc/frontends.texi (G++ and GCC): Mention Go as a supported language. * doc/sourcebuild.texi (Top Level): Mention libgo. * doc/standards.texi (Standards): Add section on Go language. Move references for other languages into their own section. * doc/contrib.texi (Contributors): Mention that I contributed the Go frontend. gcc/testsuite/: * lib/go.exp: New file. * lib/go-dg.exp: New file. * lib/go-torture.exp: New file. * lib/target-supports.exp (check_compile): Match // Go. From-SVN: r167407
49 lines
973 B
Go
49 lines
973 B
Go
// Copyright 2009-2010 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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package math
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/*
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Floating-point mod function.
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*/
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// Fmod returns the floating-point remainder of x/y.
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// The magnitude of the result is less than y and its
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// sign agrees with that of x.
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//
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// Special cases are:
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// if x is not finite, Fmod returns NaN
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// if y is 0 or NaN, Fmod returns NaN
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func Fmod(x, y float64) float64 {
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// TODO(rsc): Remove manual inlining of IsNaN, IsInf
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// when compiler does it for us.
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if y == 0 || x > MaxFloat64 || x < -MaxFloat64 || x != x || y != y { // y == 0 || IsInf(x, 0) || IsNaN(x) || IsNan(y)
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return NaN()
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}
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if y < 0 {
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y = -y
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}
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yfr, yexp := Frexp(y)
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sign := false
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r := x
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if x < 0 {
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r = -x
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sign = true
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}
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for r >= y {
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rfr, rexp := Frexp(r)
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if rfr < yfr {
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rexp = rexp - 1
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}
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r = r - Ldexp(y, rexp-yexp)
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}
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if sign {
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r = -r
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}
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return r
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}
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