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
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
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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// Floor returns the greatest integer value less than or equal to x.
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//
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// Special cases are:
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// Floor(+Inf) = +Inf
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// Floor(-Inf) = -Inf
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// Floor(NaN) = NaN
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func Floor(x 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 x == 0 || x != x || x > MaxFloat64 || x < -MaxFloat64 { // x == 0 || IsNaN(x) || IsInf(x, 0)
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return x
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}
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if x < 0 {
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d, fract := Modf(-x)
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if fract != 0.0 {
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d = d + 1
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}
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return -d
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}
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d, _ := Modf(x)
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return d
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}
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// Ceil returns the least integer value greater than or equal to x.
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//
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// Special cases are:
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// Ceil(+Inf) = +Inf
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// Ceil(-Inf) = -Inf
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// Ceil(NaN) = NaN
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func Ceil(x float64) float64 { return -Floor(-x) }
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// Trunc returns the integer value of x.
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//
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// Special cases are:
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// Trunc(+Inf) = +Inf
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// Trunc(-Inf) = -Inf
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// Trunc(NaN) = NaN
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func Trunc(x 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 x == 0 || x != x || x > MaxFloat64 || x < -MaxFloat64 { // x == 0 || IsNaN(x) || IsInf(x, 0)
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return x
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}
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d, _ := Modf(x)
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return d
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}
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