File: issue17005.go

package info (click to toggle)
gcc-arm-none-eabi 15%3A14.2.rel1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,099,328 kB
  • sloc: cpp: 3,627,108; ansic: 2,571,498; ada: 834,230; f90: 235,082; makefile: 79,231; asm: 74,984; xml: 51,692; exp: 39,736; sh: 33,298; objc: 15,629; python: 15,069; fortran: 14,429; pascal: 7,003; awk: 5,070; perl: 3,106; ml: 285; lisp: 253; lex: 204; haskell: 135
file content (46 lines) | stat: -rw-r--r-- 798 bytes parent folder | download | duplicates (35) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
 
// compile

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This tickles (a version of) the PPC64 back end to
// emit a BVS instruction.

package foo

type Flag int

const (
	Identity  Flag = iota - 2 // H is the identity matrix; no rotation is needed.
	Rescaling                 // H specifies rescaling.
)

type DrotmParams struct {
	Flag
}

func Drotmg(d1, d2, x1, y1 float64) (p DrotmParams, rd1, rd2, rx1 float64) {

	const (
		gam    = 4.0
		gamsq  = 16.0
		rgamsq = 5e-8
	)

	if d1 < 0 {
		p.Flag = Rescaling
		return
	}

	for rd1 <= rgamsq || rd1 >= gamsq {
		if rd1 <= rgamsq {
			rd1 *= gam * gam
			rx1 /= gam
		} else {
			rd1 /= gam * gam
			rx1 *= gam
		}
	}
	return
}