AMD K5

Control Register 4 (CR4) Extensions 3-17
18524C/0—Nov1996 AMD-K5 Processor Technical Reference Manual
Table 3-5B. Instructions that Modify the IF or VIF Flags—Protected Mode
TYPE PE VM VME PVI IOPL
Handler
CPL
GP(0) IF VIF
CLI 1 0 —0≥ CPL — No IF ← 0—
CLI 1 0 — 0 < CPL — Yes — —
STI 1 0 — 0 ≥ CPL — No IF ← 1—
STI 1 0 — 0 < CPL — Yes — —
PUSHF 1 0 — 0 ≥ CPL — No Pushed —
PUSHF 1 0 — 0 < CPL — No Pushed —
PUSHFD 1 0 — 0 ≥ CPL — No Pushed Pushed
PUSHFD 1 0 — 0 < CPL — No Pushed Pushed
POPF 1 0 — 0 ≥ CPL — No Popped —
POPF 1 0 — 0 < CPL — No Not Popped —
POPFD 1 0 — 0 ≥ CPL — No Popped Not Popped
POPFD 1 0 — 0 < CPL — No Not Popped Not Popped
IRET 1 0 — 0 — = 0 No Popped —
IRET 1 0 — 0 ≥ CPL > 0
No
1
Popped —
IRET 1 0 — 0 < CPL > 0
No
1
Not Popped —
IRETD 1 0 — 0 — = 0 No Popped Popped
IRETD 1 0 — 0 ≥ CPL > 0
No
1
Popped Not Popped
IRETD 1 0 — 0 < CPL > 0
No
1
Not Popped Not Popped
Notes:
1. GP(0) if the CPL of the task executing IRETD is greater than the CPL of the task returned to.
— Not applicable.