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cmd/compile: special-case const comparisons against zero

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Constant comparisons against 0 are reasonably common.
Special-case and avoid allocating a new zero value each time.

Change-Id: I6c526c8ab30ef7f0fef59110133c764b7b90ba05
Reviewed-on: https://go-review.googlesource.com/20956
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Robert Griesemer 2016-03-21 10:52:03 -07:00
parent d3253876f2
commit 07749aef98
3 changed files with 11 additions and 10 deletions
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10
src/cmd/compile/internal/gc/mpfloat.go
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@ -116,11 +116,11 @@ func (a *Mpflt) Cmp(b *Mpflt) int {
return a.Val.Cmp(&b.Val)
}
func (b *Mpflt) CmpFloat64(c float64) int {
var a Mpflt
a.SetFloat64(c)
return b.Cmp(&a)
func (a *Mpflt) CmpFloat64(c float64) int {
if c == 0 {
return a.Val.Sign() // common case shortcut
}
return a.Val.Cmp(big.NewFloat(c))
}
func (a *Mpflt) Float64() float64 {