x86 Assembly Language Reference Manual

Control Instructions (Floating-Point)

The floating-point control instructions operate on the floating-point register stack and save and restore the floating-point state.

Table 3–18 Control Instructions (Floating-Point)


Solaris Mnemonic	Intel/AMD Mnemonic	Description
`fclex`	`FCLEX`	clear floating-point exception flags after checking for error conditions
`fdecstp`	`FDECSTP`	decrement floating-point register stack pointer
`ffree`	`FFREE`	free floating-point register
`fincstp`	`FINCSTP`	increment floating-point register stack pointer
`finit`	`FINIT`	initialize floating-point unit after checking error conditions
`fldcw`	`FLDCW`	load floating-point unit control word
`fldenv`	`FLDENV`	load floating-point unit environment
`fnclex`	`FNCLEX`	clear floating-point exception flags without checking for error conditions
`fninit`	`FNINIT`	initialize floating-point unit without checking error conditions
`fnop`	`FNOP`	floating-point no operation
`fnsave`	`FNSAVE`	save floating-point unit state without checking error conditions
`fnstcw`	`FNSTCW`	store floating-point unit control word without checking error conditions
`fnstenv`	`FNSTENV`	store floating-point unit environment without checking error conditions
`fnstsw`	`FNSTSW`	store floating-point unit status word without checking error conditions
`frstor`	`FRSTOR`	restore floating-point unit state
`fsave`	`FSAVE`	save floating-point unit state after checking error conditions
`fstcw`	`FSTCW`	store floating-point unit control word after checking error conditions
`fstenv`	`FSTENV`	store floating-point unit environment after checking error conditions
`fstsw`	`FSTSW`	store floating-point unit status word after checking error conditions
`fwait`	`FWAIT`	wait for floating-point unit
`wait`	`WAIT`	wait for floating-point unit