Updates:
Owner: [email protected]
Comment #1 on issue 3118 by [email protected]: Improve costant folding
of typeof x === <typename>
http://code.google.com/p/v8/issues/detail?id=3118
r19759 replaces the typeof-is-and-branch with a constant.
0x51d48d44 36 b991803058 mov ecx,0x58308091 ;; object:
0x58308091 <undefined>
0x51d48d49 41 33c0 xor eax,eax
;;; <@14,#21> -------------------- B2 (loop header)
--------------------
;;; <@17,#25> compare-numeric-and-branch
0x51d48d4b 43 3dd0070000 cmp eax,0x7d0 ;; debug:
position 56
0x51d48d50 48 0f8d16000000 jnl 76 (0x51d48d6c)
;;; <@18,#26> -------------------- B3
(unreachable/replaced) --------------------
;;; <@22,#32> -------------------- B4 --------------------
;;; <@24,#34> stack-check
0x51d48d56 54 3b25841ab409 cmp esp,[0x9b41a84]
0x51d48d5c 60 0f8212000000 jc 84 (0x51d48d74)
;;; <@28,#42> -------------------- B5 --------------------
;;; <@30,#44> gap
0x51d48d62 66 b9c1803058 mov ecx,0x583080c1 ;; debug:
position 88
;; object:
0x583080c1 <false>
;;; <@32,#39> -------------------- B6
(unreachable/replaced) --------------------
;;; <@36,#46> -------------------- B7 --------------------
;;; <@38,#50> add-i
0x51d48d67 71 83c002 add eax,0x2 ;; debug:
position 65
;;; <@41,#53> goto
0x51d48d6a 74 ebdf jmp 43 (0x51d48d4b)
;;; <@42,#29> -------------------- B8
(unreachable/replaced) --------------------
;;; <@46,#54> -------------------- B9 --------------------
;;; <@47,#54> gap
0x51d48d6c 76 89c8 mov eax,ecx
;;; <@48,#57> return
Next step would be hoisting the constant out of the loop and eliminating
that loop. Also, we are still loading that "undefined" string.
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