DynASM/x86: Add BMI1 and BMI2 instructions.

Thanks to Peter Cawley.

dynasm/dasm_x86.lua

@@ -955,6 +955,7 @@ end
 --   "u"       Use VEX encoding, vvvv unused.
 --   "v"/"V"   Use VEX encoding, vvvv from 1st/2nd operand (the operand is
 --             removed from the list used by future characters).
+--   "w"       Use VEX encoding, vvvv from 3rd operand.
 --   "L"       Force VEX.L
 --
 -- All of the following characters force a flush of the opcode:
@@ -1677,6 +1678,24 @@ local map_op = {
   -- Intel ADX
   adcx_2 =	"rmqd:660F38F6rM",
   adox_2 =	"rmqd:F30F38F6rM",
+
+  -- BMI1
+  andn_3 =	"rrmqd:0F38VF2rM",
+  bextr_3 =	"rmrqd:0F38wF7rM",
+  blsi_2 =	"rmqd:0F38vF33m",
+  blsmsk_2 =	"rmqd:0F38vF32m",
+  blsr_2 =	"rmqd:0F38vF31m",
+  tzcnt_2 =	"rmqdw:F30FBCrM",
+
+  -- BMI2
+  bzhi_3 =	"rmrqd:0F38wF5rM",
+  mulx_3 =	"rrmqd:F20F38VF6rM",
+  pdep_3 =	"rrmqd:F20F38VF5rM",
+  pext_3 =	"rrmqd:F30F38VF5rM",
+  rorx_3 =	"rmSqd:F20F3AuF0rMS",
+  sarx_3 =	"rmrqd:F30F38wF7rM",
+  shrx_3 =	"rmrqd:F20F38wF7rM",
+  shlx_3 =	"rmrqd:660F38wF7rM",
 }
 
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