6.1.8 Processor mapping of registers

This indicates what registers are used for what purposes on each of the processors supported by Free Pascal. It also indicates which registers can be used as scratch registers.

Intel 80x86 version

Table 6.1:

Intel 80x86 Register table


Generic register name	CPU Register name

accumulator	EAX
accumulator (64-bit) high / low	EDX:EAX
oat result	FP(0)
self	ESI
frame pointer	EBP
stack pointer	ESP
scratch regs.	N/A

Motorola 680x0 version

Table 6.2:

Motorola 680x0 Register table


Generic register name	CPU Register name

accumulator	D0²
accumulator (64-bit) high / low	D0:D1
oat result	FP0³
self	A5
frame pointer	A6
stack pointer	A7
scratch regs.	D0, D1, A0, A1, FP0, FP1

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