diff --git a/.github/workflows/test_qemu.yml b/.github/workflows/test_qemu.yml
index 6742e01..3d2aadf 100644
--- a/.github/workflows/test_qemu.yml
+++ b/.github/workflows/test_qemu.yml
@@ -14,7 +14,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.18.x]
+        go-version: [1.21.x]
         arch: [arm64]  
     runs-on: ubuntu-latest
     steps:
diff --git a/internal/bigmod/nat_386.s b/internal/bigmod/nat_386.s
index 626878b..d988a00 100644
--- a/internal/bigmod/nat_386.s
+++ b/internal/bigmod/nat_386.s
@@ -10,24 +10,24 @@
 // func addMulVVW256(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW256(SB), $0-16
 	MOVL	$8, BX
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1024(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1024(SB), $0-16
 	MOVL	$32, BX
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1536(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1536(SB), $0-16
 	MOVL	$48, BX
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW2048(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW2048(SB), $0-16
 	MOVL	$64, BX
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
-TEXT addMulVVWx(SB), NOFRAME|NOSPLIT, $0
+TEXT addMulVVWy(SB), NOFRAME|NOSPLIT, $0
 	MOVL z+0(FP), DI
 	MOVL x+4(FP), SI
 	MOVL y+8(FP), BP
diff --git a/internal/bigmod/nat_arm.s b/internal/bigmod/nat_arm.s
index 6570b3a..b4ca023 100644
--- a/internal/bigmod/nat_arm.s
+++ b/internal/bigmod/nat_arm.s
@@ -10,24 +10,24 @@
 // func addMulVVW256(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW256(SB), $0-16
 	MOVW	$8, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1024(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1024(SB), $0-16
 	MOVW	$32, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1536(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1536(SB), $0-16
 	MOVW	$48, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW2048(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW2048(SB), $0-16
 	MOVW	$64, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
-TEXT addMulVVWx(SB), NOFRAME|NOSPLIT, $0
+TEXT addMulVVWy(SB), NOFRAME|NOSPLIT, $0
 	MOVW	$0, R0
 	MOVW	z+0(FP), R1
 	MOVW	x+4(FP), R2
diff --git a/internal/bigmod/nat_arm64.s b/internal/bigmod/nat_arm64.s
index d4983d0..06a59b0 100644
--- a/internal/bigmod/nat_arm64.s
+++ b/internal/bigmod/nat_arm64.s
@@ -10,24 +10,24 @@
 // func addMulVVW256(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW256(SB), $0-32
 	MOVD	$4, R0
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1024(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1024(SB), $0-32
 	MOVD	$16, R0
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1536(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1536(SB), $0-32
 	MOVD	$24, R0
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW2048(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW2048(SB), $0-32
 	MOVD	$32, R0
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
-TEXT addMulVVWx(SB), NOFRAME|NOSPLIT, $0
+TEXT addMulVVWy(SB), NOFRAME|NOSPLIT, $0
 	MOVD	z+0(FP), R1
 	MOVD	x+8(FP), R2
 	MOVD	y+16(FP), R3
diff --git a/internal/bigmod/nat_ppc64x.s b/internal/bigmod/nat_ppc64x.s
index 735639c..99c6a1e 100644
--- a/internal/bigmod/nat_ppc64x.s
+++ b/internal/bigmod/nat_ppc64x.s
@@ -11,24 +11,24 @@
 // func addMulVVW256(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW256(SB), $0-32
 	MOVD	$4, R22 // R22 = z_len
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1024(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1024(SB), $0-32
 	MOVD	$16, R22 // R22 = z_len
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1536(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1536(SB), $0-32
 	MOVD	$24, R22 // R22 = z_len
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW2048(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW2048(SB), $0-32
 	MOVD	$32, R22 // R22 = z_len
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
-TEXT addMulVVWx(SB), NOFRAME|NOSPLIT, $0
+TEXT addMulVVWy(SB), NOFRAME|NOSPLIT, $0
 	MOVD z+0(FP), R10	// R10 = z[]
 	MOVD x+8(FP), R8	// R8 = x[]
 	MOVD y+16(FP), R9	// R9 = y
diff --git a/internal/bigmod/nat_s390x.s b/internal/bigmod/nat_s390x.s
index 02389ac..94f70ff 100644
--- a/internal/bigmod/nat_s390x.s
+++ b/internal/bigmod/nat_s390x.s
@@ -10,24 +10,24 @@
 // func addMulVVW256(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW256(SB), $0-32
 	MOVD	$4, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1024(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1024(SB), $0-32
 	MOVD	$16, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW1536(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW1536(SB), $0-32
 	MOVD	$24, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
 // func addMulVVW2048(z, x *uint, y uint) (c uint)
 TEXT ·addMulVVW2048(SB), $0-32
 	MOVD	$32, R5
-	JMP		addMulVVWx(SB)
+	JMP		addMulVVWy(SB)
 
-TEXT addMulVVWx(SB), NOFRAME|NOSPLIT, $0
+TEXT addMulVVWy(SB), NOFRAME|NOSPLIT, $0
 	MOVD z+0(FP), R2
 	MOVD x+8(FP), R8
 	MOVD y+16(FP), R9