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rat.go (669B)

      1 // Copyright (c) 2014 The mathutil Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package mathutil // import "modernc.org/mathutil"
      6 
      7 // QCmpUint32 compares a/b and c/d and returns:
      8 //
      9 //   -1 if a/b <  c/d
     10 //    0 if a/b == c/d
     11 //   +1 if a/b >  c/d
     12 //
     13 func QCmpUint32(a, b, c, d uint32) int {
     14 	switch x, y := uint64(a)*uint64(d), uint64(b)*uint64(c); {
     15 	case x < y:
     16 		return -1
     17 	case x == y:
     18 		return 0
     19 	default: // x > y
     20 		return 1
     21 	}
     22 }
     23 
     24 // QScaleUint32 returns a such that a/b >= c/d.
     25 func QScaleUint32(b, c, d uint32) (a uint64) {
     26 	return 1 + (uint64(b)*uint64(c))/uint64(d)
     27 }