FSAVE

Operation

Saves the floating-point user-state record.

Assembler Syntax

FSAVE [Rn(r)]

Privilege

Unprivileged

Required CPUID flags

FP

FSAVE writes one 192-byte, 64-byte-aligned floating-point user-state record. A clean initial floating-point state may use an all-clear presence bitmap; otherwise FSAVE may conservatively mark and write every floating-point slot. FSAVE does not change clean or modified state.

2.75in

Encodings

FSAVE [Rn(r)]

Format: Instruction format for FSAVE [Rn(r)]