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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

Popped —

IRET 1 0 — 0 < CPL > 0

Not Popped —

IRETD 1 0 — 0 — = 0 No Popped Popped

IRETD 1 0 — 0 ≥ CPL > 0

Popped Not Popped

IRETD 1 0 — 0 < CPL > 0

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.

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