diff --git a/insns.dat b/insns.dat
index 7d8e050d..23241b9d 100644
--- a/insns.dat
+++ b/insns.dat
@@ -2024,10 +2024,10 @@ PFRCP		mmxreg,mmxrm		\323\2\x0F\x0F\110\1\x86	PENT,3DNOW,SQ,CYRIX
 PFRSQRT		mmxreg,mmxrm		\323\2\x0F\x0F\110\1\x87	PENT,3DNOW,SQ,CYRIX
 
 ;# Intel AVX instructions
-VPERMIL2PS	xmmreg,xmmreg,xmmrm,xmmreg,imm	\260\103\101\1\x48\123\172\34	AVX,SANDYBANKS
-VPERMIL2PS	xmmreg,xmmreg,xmmreg,xmmrm,imm	\260\103\111\1\x48\132\172\14	AVX,SANDYBANKS
-VPERMIL2PS	ymmreg,ymmreg,ymmrm,ymmreg,imm	\260\103\105\1\x48\123\172\34	AVX,SANDYBANKS
-VPERMIL2PS	ymmreg,ymmreg,ymmreg,ymmrm,imm	\260\103\115\1\x48\132\172\14	AVX,SANDYBANKS
+VPERMIL2PS	xmmreg,xmmreg,xmmrm,xmmreg,imm	\260\103\101\1\x48\123\172\34	AVX,SANDYBRIDGE
+VPERMIL2PS	xmmreg,xmmreg,xmmreg,xmmrm,imm	\260\103\111\1\x48\132\172\14	AVX,SANDYBRIDGE
+VPERMIL2PS	ymmreg,ymmreg,ymmrm,ymmreg,imm	\260\103\105\1\x48\123\172\34	AVX,SANDYBRIDGE
+VPERMIL2PS	ymmreg,ymmreg,ymmreg,ymmrm,imm	\260\103\115\1\x48\132\172\14	AVX,SANDYBRIDGE
 
 ;# VIA (Centaur) security instructions
 XSTORE		void			\3\x0F\xA7\xC0			PENT,CYRIX
diff --git a/insns.h b/insns.h
index 7a0ecff7..7189a55c 100644
--- a/insns.h
+++ b/insns.h
@@ -115,7 +115,8 @@ extern const struct disasm_index itable[256];
 #define IF_PRESCOTT   0x09000000UL      /* Prescott instructions */
 #define IF_X86_64 0x0A000000UL	/* x86-64 instruction (long or legacy mode) */
 #define IF_NEHALEM 0x0B000000UL  /* Nehalem instruction */
-#define IF_SANDYBANKS 0x0C000000UL /* Sandy Banks instruction */
+#define IF_WESTMERE 0x0C000000UL   /* Westmere instruction */
+#define IF_SANDYBRIDE 0x0D000000UL /* Sandy Bridge instruction */
 #define IF_X64	  (IF_LONG|IF_X86_64)
 #define IF_IA64   0x0F000000UL  /* IA64 instructions (in x86 mode) */
 #define IF_CYRIX  0x10000000UL  /* Cyrix-specific instruction */