cmd/internal/obj/arm64: simplify conclass

Reduce repetition by pulling some common conversions into variables.

Change-Id: I8c1cc806236b5ecdadf90f4507923718fa5de9b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/650937
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 11 insertions, 11 deletions

diff --git a/src/cmd/internal/obj/arm64/asm7.go b/src/cmd/internal/obj/arm64/asm7.go
index 0fc7815e41..529d4eda5d 100644
--- a/src/cmd/internal/obj/arm64/asm7.go
+++ b/src/cmd/internal/obj/arm64/asm7.go
@@ -1904,45 +1904,45 @@ func rclass(r int16) int {
 
 // conclass classifies a constant.
 func conclass(v int64) int {
+	vbitcon := uint64(v)
+	vnotcon := ^v
+
 	if v == 0 {
 		return C_ZCON
 	}
 	if isaddcon(v) {
 		if v <= 0xFFF {
-			if isbitcon(uint64(v)) {
+			if isbitcon(vbitcon) {
 				return C_ABCON0
 			}
 			return C_ADDCON0
 		}
-		if isbitcon(uint64(v)) {
+		if isbitcon(vbitcon) {
 			return C_ABCON
 		}
 		if movcon(v) >= 0 {
 			return C_AMCON
 		}
-		if movcon(^v) >= 0 {
+		if movcon(vnotcon) >= 0 {
 			return C_AMCON
 		}
 		return C_ADDCON
 	}
 
-	t := movcon(v)
-	if t >= 0 {
-		if isbitcon(uint64(v)) {
+	if t := movcon(v); t >= 0 {
+		if isbitcon(vbitcon) {
 			return C_MBCON
 		}
 		return C_MOVCON
 	}
-
-	t = movcon(^v)
-	if t >= 0 {
-		if isbitcon(uint64(v)) {
+	if t := movcon(vnotcon); t >= 0 {
+		if isbitcon(vbitcon) {
 			return C_MBCON
 		}
 		return C_MOVCON
 	}
 
-	if isbitcon(uint64(v)) {
+	if isbitcon(vbitcon) {
 		return C_BITCON
 	}