Updates:
Summary: "instanceof" operator broken on x64
Status: Assigned
Owner: [email protected]
Labels: Type-Bug Priority-Medium
Comment #18 on issue 615 by [email protected]: "instanceof" operator
broken on x64
http://code.google.com/p/v8/issues/detail?id=615
Thanks a lot for your patience.
Bill, can you take a look? These lines in
MacroAssembler::TryGetFunctionPrototype(rdx,rbx,Label*):
CmpObjectType(result, MAP_TYPE, kScratchRegister);
j(not_equal, &done);
produce
0x2aaaaf859cb9 89 4c8b53ff REX.W movq r10,[rbx-0x1]
0x2aaaaf859cbd 93 41807a0b80 cmpb [r10+0xb],0x80
0x2aaaaf859cc2 98 0f850d000000 jnz 117 (0x2aaaaf859cd5)
in debug (which works) but
0x2aaaaf78fc59 89 488b43ff REX.W movq rax,[rbx-0x1]
0x2aaaaf78fc5d 93 80780b80 cmpb [rax+0xb],0x80
0x2aaaaf78fc61 97 0f850d000000 jnz 116 (0x2aaaaf78fc74)
in release (which doesn't because it clobbers a live rax).
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