Hi,
in x64 implementation I can see that code
const Register kRootRegister = { 13 }; // r13 (callee save).
// Actual value of root register is offset from the root array's start
// to take advantage of negitive 8-bit displacement values.
What does it mean?
It used here:
Label convert_global_proxy;
__ JumpIfRoot(rcx, Heap::kUndefinedValueRootIndex,
&convert_global_proxy, Label::kNear);
__ JumpIfNotRoot(rcx, Heap::kNullValueRootIndex, &convert_to_object,
Label::kNear);
In asm this code is:
0x2ecf4661ca9a 58 493b4da8 REX.W cmpq rcx,[r13-0x58]
0x2ecf4661ca9e 62 7406 jz 70 (0x2ecf4661caa6)
0x2ecf4661caa0 64 493b4db8 REX.W cmpq rcx,[r13-0x48]
0x2ecf4661caa4 68 750d jnz 83 (0x2ecf4661cab3)
Somebody knows what are purposes for r13 (root register)?
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