Fixed register list.
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|ABI, according to http://www.x86-64.org/documentation/abi-0.99.pdf:|
|Up to 6 integer and pointer arguments are passed in registers. Nine|
|registers, %rax, %rcx, %rdx, %rsi, %rdi and %r8-%r12 can be used|
|registers, %rax, %rcx, %rdx, %rsi, %rdi and %r8-%r11 can be used|
|freely. Integers and pointers are returned in %rax.|
|Registers May be Argument|