AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

26568—Rev. 3.05—September 2003 AMD64 Technology
eFLAGS
16-bit or 32-bit flags register. Compare rFLAGS.
EFLAGS
32-bit (extended) flags register.
eIP
16-bit or 32-bit instruction-pointer register. Compare rIP.
EIP
32-bit (extended) instruction-pointer register.
FLAGS
16-bit flags register.
GDTR
Global descriptor table register.
GPRs
General-purpose registers. For the 16-bit data size, these are
AX, BX, CX, DX, DI, SI, BP, and SP. For the 32-bit data size,
these are EAX, EBX, ECX, EDX, EDI, ESI, EBP, and ESP. For
the 64-bit data size, these include RAX, RBX, RCX, RDX,
RDI, RSI, RBP, RSP, and R8–R15.
IDTR
Interrupt descriptor table register.
IP
16-bit instruction-pointer register.
LDTR
Local descriptor table register.
MSR
Model-specific register.
r8–r15
The 8-bit R8B–R15B registers, or the 16-bit R8W–R15W
registers, or the 32-bit R8D–R15D registers, or the 64-bit
R8–R15 registers.
rAX–rSP
The 16-bit AX, BX, CX, DX, DI, SI, BP, and SP registers, or
the 32-bit EAX, EBX, ECX, EDX, EDI, ESI, EBP, and ESP
registers, or the 64-bit RAX, RBX, RCX, RDX, RDI, RSI,
Preface xxiii