8-26 Vol. 1

PROGRAMMING WITH THE X87 FPU

metic instructions. It should be noted that some non-arithmetic instructions can signal a floating-point stack (fault) 
exception, but this exception is not the result of an operation on an operand.

8.5 

X87 FPU FLOATING-POINT EXCEPTION CONDITIONS

The following sections describe the various conditions that cause a floating-point exception to be generated by the 
x87 FPU and the masked response of the x87 FPU when these conditions are detected. Intel® 64 and IA-32 Archi-

Table 8-9.  Arithmetic and Non-arithmetic Instructions

Non-arithmetic Instructions

Arithmetic Instructions

FABS

F2XM1

FCHS

FADD/FADDP

FCLEX

FBLD

FDECSTP

FBSTP

FFREE

FCOM/FCOMP/FCOMPP

FINCSTP

FCOS

FINIT/FNINIT

FDIV/FDIVP/FDIVR/FDIVRP

FLD (register-to-register)

FIADD

FLD (extended format from memory)

FICOM/FICOMP

FLD constant

FIDIV/FIDIVR

FLDCW

FILD

FLDENV

FIMUL

FNOP

FIST/FISTP

1

FRSTOR

FISUB/FISUBR

FSAVE/FNSAVE

FLD (single and double)

FST/FSTP (register-to-register)

FMUL/FMULP

FSTP (extended format to memory)

FPATAN

FSTCW/FNSTCW

FPREM/FPREM1

FSTENV/FNSTENV

FPTAN

FSTSW/FNSTSW

FRNDINT

WAIT/FWAIT

FSCALE

FXAM

FSIN

FXCH

FSINCOS
FSQRT
FST/FSTP (single and double)
FSUB/FSUBP/FSUBR/FSUBRP
FTST
FUCOM/FUCOMP/FUCOMPP
FXTRACT
FYL2X/FYL2XP1

NOTE:

1. The FISTTP instruction in SSE3 is an arithmetic x87 FPU instruction.