x86浮点运算指令

Data Transfer Instructions (Floating Point)

The data transfer instructions move floating-point, integer, and BCD values between memory and the floating point registers.

 

Table 3-13 Data Transfer Instructions (Floating-Point)

Intel/AMD Mnemonic	Description
FBLD	load BCD
FBSTP	store BCD and pop
FCMOVB	floating-point conditional move if below
FCMOVBE	floating-point conditional move if below or equal
FCMOVE	floating-point conditional move if equal
FCMOVNB	floating-point conditional move if not below
FCMOVNBE	floating-point conditional move if not below or equal
FCMOVNE	floating-point conditional move if not equal
FCMOVNU	floating-point conditional move if unordered
FCMOVU	floating-point conditional move if unordered
FILD	load integer
FIST	store integer
FISTP	store integer and pop
FLD	load floating-point value
FST	store floating-point value
FSTP	store floating-point value and pop
FXCH	exchange registers

 

Basic Arithmetic Instructions (Floating-Point)

The basic arithmetic instructions perform basic arithmetic operations on floating-point and integer operands.

 

Table 3-14 Basic Arithmetic Instructions (Floating-Point)

Intel/AMD Mnemonic	Description
FABS	absolute value
FADD	add floating-point
FADDP	add floating-point and pop
FCHS	change sign
FDIV	divide floating-point
FDIVP	divide floating-point and pop
FDIVR	divide floating-point reverse
FDIVRP	divide floating-point reverse and pop
FIADD	add integer
FIDIV	divide integer
FIDIVR	divide integer reverse
FIMUL	multiply integer
FISUB	subtract integer
FISUBR	subtract integer reverse
FMUL	multiply floating-point
FMULP	multiply floating-point and pop
FPREM	partial remainder
FPREM1	IEEE partial remainder
FRNDINT	round to integer
FSCALE	scale by power of two
FSQRT	square root
FSUB	subtract floating-point
FSUBP	subtract floating-point and pop
FSUBR	subtract floating-point reverse
FSUBRP	subtract floating-point reverse and pop
FXTRACT	extract exponent and significand

 

Comparison Instructions (Floating-Point)

The floating-point comparison instructions operate on floating-point or integer operands.

 

Table 3-15 Comparison Instructions (Floating-Point)

Intel/AMD Mnemonic	Description
FCOM	compare floating-point
FCOMI	compare floating-point and set %eflags
FCOMIP	compare floating-point, set %eflags, and pop
FCOMP	compare floating-point and pop
FCOMPP	compare floating-point and pop twice
FICOM	compare integer
FICOMP	compare integer and pop
FTST	test floating-point (compare with 0.0)
FUCOM	unordered compare floating-point
FUCOMI	unordered compare floating-point and set %eflags
FUCOMIP	unordered compare floating-point, set %eflags, and pop
FUCOMP	unordered compare floating-point and pop
FUCOMPP	compare floating-point and pop twice
FXAM	examine floating-point

 

Transcendental Instructions (Floating-Point)

The transcendental instructions perform trigonometric and logarithmic operations on floating-point operands.

 

Table 3-16 Transcendental Instructions (Floating-Point)

Intel/AMD Mnemonic	Description
F2XM1	computes 2x-1
FCOS	cosine
FPATAN	partial arctangent
FPTAN	partial tangent
FSIN	sine
FSINCOS	sine and cosine
FYL2X	computes y * log2x
FYL2XP1	computes y * log2(x+1)

 

Load Constants (Floating-Point) Instructions

The load constants instructions load common constants, such as π, into the floating-point registers.

 

Table 3-17 Load Constants Instructions (Floating-Point)

Intel/AMD Mnemonic	Description
FLD1	load +1.0
FLDL2E	load log2e
FLDL2T	load log210
FLDLG2	load log102
FLDLN2	load loge2
FLDPI	load π
FLDZ	load +0.0

 

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)

Intel/AMD Mnemonic	Description
FCLEX	clear floating-point exception flags after checking for error conditions
FDECSTP	decrement floating-point register stack pointer
FFREE	free floating-point register
FINCSTP	increment floating-point register stack pointer
FINIT	initialize floating-point unit after checking error conditions
FLDCW	load floating-point unit control word
FLDENV	load floating-point unit environment
FNCLEX	clear floating-point exception flags without checking for error conditions
FNINIT	initialize floating-point unit without checking error conditions
FNOP	floating-point no operation
FNSAVE	save floating-point unit state without checking error conditions
FNSTCW	store floating-point unit control word without checking error conditions
FNSTENV	store floating-point unit environment without checking error conditions
FNSTSW	store floating-point unit status word without checking error conditions
FRSTOR	restore floating-point unit state
FSAVE	save floating-point unit state after checking error conditions
FSTCW	store floating-point unit control word after checking error conditions
FSTENV	store floating-point unit environment after checking error conditions
FSTSW	store floating-point unit status word after checking error conditions
FWAIT	wait for floating-point unit
WAIT	wait for floating-point unit

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