diff --git a/src/cmd/internal/obj/arm64/asm7.go b/src/cmd/internal/obj/arm64/asm7.go
index f2188c3403..575436d764 100644
--- a/src/cmd/internal/obj/arm64/asm7.go
+++ b/src/cmd/internal/obj/arm64/asm7.go
@@ -720,7 +720,7 @@ var optab = []Optab{
 	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_PQAUTO_16, 67, 4, REGSP, 0, C_XPRE},
 	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_PQAUTO_16, 67, 4, REGSP, 0, C_XPOST},
 	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_UAUTO4K, 76, 8, REGSP, 0, 0},
-	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_NAUTO4K, 76, 12, REGSP, 0, 0},
+	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_NAUTO4K, 76, 8, REGSP, 0, 0},
 	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_LAUTO, 77, 12, REGSP, LTO, 0},
 	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_NQOREG_16, 67, 4, 0, 0, 0},
 	{AFSTPQ, C_PAIR, C_NONE, C_NONE, C_NQOREG_16, 67, 4, 0, 0, C_XPRE},
@@ -760,7 +760,7 @@ var optab = []Optab{
 	{ASTP, C_PAIR, C_NONE, C_NONE, C_PPAUTO, 67, 4, REGSP, 0, C_XPRE},
 	{ASTP, C_PAIR, C_NONE, C_NONE, C_PPAUTO, 67, 4, REGSP, 0, C_XPOST},
 	{ASTP, C_PAIR, C_NONE, C_NONE, C_UAUTO4K, 76, 8, REGSP, 0, 0},
-	{ASTP, C_PAIR, C_NONE, C_NONE, C_NAUTO4K, 76, 12, REGSP, 0, 0},
+	{ASTP, C_PAIR, C_NONE, C_NONE, C_NAUTO4K, 76, 8, REGSP, 0, 0},
 	{ASTP, C_PAIR, C_NONE, C_NONE, C_LAUTO, 77, 12, REGSP, LTO, 0},
 	{ASTP, C_PAIR, C_NONE, C_NONE, C_NPOREG, 67, 4, 0, 0, 0},
 	{ASTP, C_PAIR, C_NONE, C_NONE, C_NPOREG, 67, 4, 0, 0, C_XPRE},
@@ -801,7 +801,7 @@ var optab = []Optab{
 	{ASTPW, C_PAIR, C_NONE, C_NONE, C_PSAUTO_4, 67, 4, REGSP, 0, C_XPRE},
 	{ASTPW, C_PAIR, C_NONE, C_NONE, C_PSAUTO_4, 67, 4, REGSP, 0, C_XPOST},
 	{ASTPW, C_PAIR, C_NONE, C_NONE, C_UAUTO4K, 76, 8, REGSP, 0, 0},
-	{ASTPW, C_PAIR, C_NONE, C_NONE, C_NAUTO4K, 76, 12, REGSP, 0, 0},
+	{ASTPW, C_PAIR, C_NONE, C_NONE, C_NAUTO4K, 76, 8, REGSP, 0, 0},
 	{ASTPW, C_PAIR, C_NONE, C_NONE, C_LAUTO, 77, 12, REGSP, LTO, 0},
 	{ASTPW, C_PAIR, C_NONE, C_NONE, C_NSOREG_4, 67, 4, 0, 0, 0},
 	{ASTPW, C_PAIR, C_NONE, C_NONE, C_NSOREG_4, 67, 4, 0, 0, C_XPRE},