Oracle Floating Point Instructions X86 Assembly Language Reference Manual

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12/14/2017 Floating-Point Instructions - x86 Assembly Language Reference Manual

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x86 Assembly Language Reference Manual

Floating-Point Instructions

The floating point instructions operate on floating-point, integer, and binary coded decimal (BCD) operands.

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)

Solaris Mnemonic Intel/AMD Mnemonic Description Notes

fbld FBLD load BCD

fbstp FBSTP store BCD and pop

fcmovb FCMOVB floating-point conditional

move if below

fcmovbe FCMOVBE floating-point conditional

move if below or equal

fcmove FCMOVE floating-point conditional

move if equal

fcmovnb FCMOVNB floating-point conditional

move if not below

fcmovnbe FCMOVNBE floating-point conditional

move if not below or equal

fcmovne FCMOVNE floating-point conditional

move if not equal

fcmovnu FCMOVNU floating-point conditional

move if unordered

fcmovu FCMOVU floating-point conditional

move if unordered

fild FILD load integer

fist FIST store integer

fistp FISTP store integer and pop

fld FLD load floating-point value

fst FST store floating-point value

fstp FSTP store floating-point value

and pop

fxch 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)

Solaris Mnemonic Intel/AMD Mnemonic Description Notes

fabs FABS absolute value

fadd FADD add floating-point

faddp FADDP add floating-point and pop

fchs FCHS

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change sign

fdiv FDIV divide floating-point

fdivp FDIVP divide floating-point and

pop

fdivr FDIVR divide floating-point

reverse

fdivrp FDIVRP divide floating-point

reverse and pop

fiadd FIADD add integer

fidiv FIDIV divide integer

fidivr FIDIVR divide integer reverse

fimul FIMUL multiply integer

fisub FISUB subtract integer

fisubr FISUBR subtract integer reverse

fmul FMUL multiply floating-point

fmulp FMULP multiply floating-point and

pop

fprem FPREM partial remainder

fprem1 FPREM1 IEEE partial remainder

frndint FRNDINT round to integer

fscale FSCALE scale by power of two

fsqrt FSQRT square root

fsub FSUB subtract floating-point

fsubp FSUBP subtract floating-point and

pop

fsubr FSUBR subtract floating-point

reverse

fsubrp FSUBRP subtract floating-point

reverse and pop

fxtract 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)

Solaris Mnemonic Intel/AMD Mnemonic Description Notes

fcom FCOM compare floating-point

fcomi FCOMI compare floating-point

and set %eflags

fcomip FCOMIP compare floating-point, set

%eflags, and pop

fcomp FCOMP compare floating-point

and pop

fcompp FCOMPP compare floating-point

and pop twice

ficom FICOM compare integer

ficomp FICOMP compare integer and pop

ftst FTST test floating-point

(compare with 0.0)

fucom FUCOM unordered compare

floating-point

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fucomi FUCOMI unordered compare

floating-point and set

%eflags

fucomip FUCOMIP unordered compare

floating-point, set %eflags,

and pop

fucomp FUCOMP unordered compare

floating-point and pop

fucompp FUCOMPP compare floating-point

and pop twice

fxam 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)

Solaris Mnemonic Intel/AMD Mnemonic Description Notes

f2xm1 F2XM1 computes 2x-1

fcos FCOS cosine

fpatan FPATAN partial arctangent

fptan FPTAN partial tangent

fsin FSIN sine

fsincos FSINCOS sine and cosine

fyl2x FYL2X computes y * log2x

fyl2xp1 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)

Solaris Mnemonic Intel/AMD Mnemonic Description Notes

fld1 FLD1 load +1.0

fldl2e FLDL2E load log2e

fldl2t FLDL2T load log210

fldlg2 FLDLG2 load log102

fldln2 FLDLN2 load loge2

fldpi FLDPI load π

fldz 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)

Solaris Mnemonic Intel/AMD Mnemonic Description Notes

fclex FCLEX clear floating-point

exception flags after

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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