From b4ff4792989853b82150c1dc136ba024f6a09d0a Mon Sep 17 00:00:00 2001
From: Jorropo <jorropo.pgm@gmail.com>
Date: Sun, 13 Nov 2022 20:41:58 +0100
Subject: [PATCH] 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>
---
 src/cmd/compile/internal/ssa/_gen/main.go | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/src/cmd/compile/internal/ssa/_gen/main.go b/src/cmd/compile/internal/ssa/_gen/main.go
index 6a8ae0e45c..f37438796c 100644
--- a/src/cmd/compile/internal/ssa/_gen/main.go
+++ b/src/cmd/compile/internal/ssa/_gen/main.go
@@ -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
-- 
2.50.0