Status: Accepted
Owner: ----
CC: [email protected]
Labels: Type-Bug Priority-Medium
New issue 2881 by [email protected]: Code generator still generates
constants even if the inlined into instruction
http://code.google.com/p/v8/issues/detail?id=2881
In
function foo(x, y) {
return Math.floor((x + y) / 2);
}
foo(1, 10);
foo(1, 10);
foo(1, 10);
%OptimizeFunctionOnNextCall(foo);
foo(1, 10);
core of foo gets compiled as
;;; <@20,#14> add-i
0x5fe33792 50 03c8 add ecx,eax
0x5fe33794 52 0f80dd000000 jo 279 (0x5fe33877)
;;; <@22,#27> constant-d
0x5fe3379a 58 0f57c9 xorps xmm1,xmm1
0x5fe3379d 61 b800000040 mov eax,0x40000000
0x5fe337a2 66 660f3a22c801 pinsrd xmm1,eax,1
;;; <@24,#19> check-maps
;;; <@26,#31> math-floor-of-div
0x5fe337a8 72 89c8 mov eax,ecx
0x5fe337aa 74 d1f8 sar eax,1
Notice that code generator emits double constant 2, which is unused by
math-floor-of-div actually.
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