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cmd/compile: remove manually implemented popcount in _gen/main.go

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Change-Id: I7b4da26bace15c2b632c2dbfe56cc2799bbfdb02
Reviewed-on: https://go-review.googlesource.com/c/go/+/450058
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
This commit is contained in:
Jorropo 2022-11-13 20:41:58 +01:00 committed by Keith Randall
parent 362713183a
commit b4ff479298
1 changed files with 2 additions and 6 deletions
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8
src/cmd/compile/internal/ssa/_gen/main.go
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@ -12,6 +12,7 @@ import (
"fmt"
"go/format"
"log"
"math/bits"
"os"
"path"
"regexp"
@ -546,12 +547,7 @@ func (a arch) Name() string {
// countRegs returns the number of set bits in the register mask.
func countRegs(r regMask) int {
n := 0
for r != 0 {
n += int(r & 1)
r >>= 1
}
return n
return bits.OnesCount64(uint64(r))
}
// for sorting a pair of integers by key