diff --git a/src/cmd/asm/internal/asm/testdata/ppc64.s b/src/cmd/asm/internal/asm/testdata/ppc64.s
index b3736bf..ba64d84 100644
--- a/src/cmd/asm/internal/asm/testdata/ppc64.s
+++ b/src/cmd/asm/internal/asm/testdata/ppc64.s
@@ -1037,6 +1037,7 @@
 // VSX load with length X-form (also left-justified)
 	LXVL        R3,R4, VS0
 	LXVLL       R3,R4, VS0
+	LXVX        R3,R4, VS0
 // VSX load, DQ-form
 // <MNEMONIC> DQ(RA), XS produces
 // <mnemonic> XS, DQ(RA)
@@ -1060,6 +1061,7 @@
 // VSX store with length, X-form (also left-justified)
 	STXVL	    VS0, R3,R4
 	STXVLL      VS0, R3,R4
+	STXVX       VS0, R3,R4
 
 //	VSX move from VSR, XX1-form
 //	<MNEMONIC> XS,RA produces
diff --git a/src/cmd/asm/internal/asm/testdata/ppc64enc.s b/src/cmd/asm/internal/asm/testdata/ppc64enc.s
index 07a8a54..10a05ec 100644
--- a/src/cmd/asm/internal/asm/testdata/ppc64enc.s
+++ b/src/cmd/asm/internal/asm/testdata/ppc64enc.s
@@ -595,11 +595,13 @@
 	LXV 16(R3), VS1                 // f4230011
 	LXVL R3, R4, VS1                // 7c23221a
 	LXVLL R3, R4, VS1               // 7c23225a
+	LXVX R3, R4, VS1                // 7c232218
 	LXSDX (R3)(R4), VS1             // 7c241c98
 	STXVD2X VS1, (R3)(R4)           // 7c241f98
 	STXV VS1,16(R3)                 // f4230015
 	STXVL VS1, R3, R4               // 7c23231a
 	STXVLL VS1, R3, R4              // 7c23235a
+	STXVX VS1, R3, R4               // 7c232318
 	STXSDX VS1, (R3)(R4)            // 7c241d98
 	LXSIWAX (R3)(R4), VS1           // 7c241898
 	STXSIWX VS1, (R3)(R4)           // 7c241918
diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 238ca8f..3c82477 100644
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -1584,8 +1584,9 @@
 		case ALXV: /* lxv */
 			opset(ALXV, r0)
 
-		case ALXVL: /* lxvl */
+		case ALXVL: /* lxvl, lxvll, lxvx */
 			opset(ALXVLL, r0)
+			opset(ALXVX, r0)
 
 		case ASTXVD2X: /* stxvd2x, stxvdsx, stxvw4x, stxvh8x, stxvb16x */
 			opset(ASTXVW4X, r0)
@@ -1595,8 +1596,9 @@
 		case ASTXV: /* stxv */
 			opset(ASTXV, r0)
 
-		case ASTXVL: /* stxvl, stxvll */
+		case ASTXVL: /* stxvl, stxvll, stvx */
 			opset(ASTXVLL, r0)
+			opset(ASTXVX, r0)
 
 		case ALXSDX: /* lxsdx  */
 			opset(ALXSDX, r0)
@@ -5020,11 +5022,13 @@
 	case AMOVW:
 		return OPVCC(58, 0, 0, 0) | 1<<1 /* lwa */
 	case ALXV:
-		return OPDQ(61, 1, 0) /* lxv - ISA v3.00 */
+		return OPDQ(61, 1, 0) /* lxv - ISA v3.0 */
 	case ALXVL:
-		return OPVXX1(31, 269, 0) /* lxvl - ISA v3.00 */
+		return OPVXX1(31, 269, 0) /* lxvl - ISA v3.0 */
 	case ALXVLL:
-		return OPVXX1(31, 301, 0) /* lxvll - ISA v3.00 */
+		return OPVXX1(31, 301, 0) /* lxvll - ISA v3.0 */
+	case ALXVX:
+		return OPVXX1(31, 268, 0) /* lxvx - ISA v3.0 */
 
 		/* no AMOVWU */
 	case AMOVB, AMOVBZ:
@@ -5122,8 +5126,6 @@
 		return OPVCC(31, 309, 0, 0) /* ldmx */
 
 	/* Vector (VMX/Altivec) instructions */
-	/* ISA 2.03 enables these for PPC970. For POWERx processors, these */
-	/* are enabled starting at POWER6 (ISA 2.05). */
 	case ALVEBX:
 		return OPVCC(31, 7, 0, 0) /* lvebx - v2.03 */
 	case ALVEHX:
@@ -5141,7 +5143,8 @@
 		/* End of vector instructions */
 
 	/* Vector scalar (VSX) instructions */
-	/* ISA 2.06 enables these for POWER7. */
+	case ALXVX:
+		return OPVXX1(31, 268, 0) /* lxvx - ISA v3.0 */
 	case ALXVD2X:
 		return OPVXX1(31, 844, 0) /* lxvd2x - v2.06 */
 	case ALXVW4X:
@@ -5208,6 +5211,8 @@
 		return OPVXX1(31, 397, 0) /* stxvl ISA 3.0 */
 	case ASTXVLL:
 		return OPVXX1(31, 429, 0) /* stxvll ISA 3.0 */
+	case ASTXVX:
+		return OPVXX1(31, 396, 0) /* stxvx - ISA v3.0 */
 
 	}
 
@@ -5271,8 +5276,6 @@
 		return OPVCC(31, 181, 0, 0) /* stdux */
 
 	/* Vector (VMX/Altivec) instructions */
-	/* ISA 2.03 enables these for PPC970. For POWERx processors, these */
-	/* are enabled starting at POWER6 (ISA 2.05). */
 	case ASTVEBX:
 		return OPVCC(31, 135, 0, 0) /* stvebx - v2.03 */
 	case ASTVEHX:
@@ -5286,15 +5289,16 @@
 		/* End of vector instructions */
 
 	/* Vector scalar (VSX) instructions */
-	/* ISA 2.06 enables these for POWER7. */
+	case ASTXVX:
+		return OPVXX1(31, 396, 0) /* stxvx - v3.0 */
 	case ASTXVD2X:
 		return OPVXX1(31, 972, 0) /* stxvd2x - v2.06 */
 	case ASTXVW4X:
 		return OPVXX1(31, 908, 0) /* stxvw4x - v2.06 */
 	case ASTXVH8X:
-		return OPVXX1(31, 940, 0) /* stxvh8x - v3.00 */
+		return OPVXX1(31, 940, 0) /* stxvh8x - v3.0 */
 	case ASTXVB16X:
-		return OPVXX1(31, 1004, 0) /* stxvb16x - v3.00 */
+		return OPVXX1(31, 1004, 0) /* stxvb16x - v3.0 */
 
 	case ASTXSDX:
 		return OPVXX1(31, 716, 0) /* stxsdx - v2.06 */