Floating-point Class Instruction

fclass

Operation Font Conventions

Instruction Type F

Format

(qp) fclass.fcrel.fctype p1, p2 = f2, fclass9

Description

The contents of f2 are classified according to the fclass9 completer. This produces a boolean result based on whether the contents of FR f2 agrees with the floating-point number format specified by fclass9, as specified by the fcrel completer. This result is written to the two predicate register destinations, p1 and p2. The result written to the destinations is determined by the compare type specified by fctype.

The allowed compare types are Normal (or none) and unc. The assembly syntax allows the specification of membership or non-membership and the assembler swaps the target predicates to achieve the desired effect.

A number agrees with the pattern specified by fclass9 if:

• the number is NaTVal and fclass9 {8} is 1, or

• the number is a quiet NaN and fclass9 {7} is 1, or

• the number is a signalling NaN and fclass9 {6} is 1, or

• the sign of the number agrees with the sign specified by one of the two low-order bits of fclass9, and the type of the number (disregarding the sign) agrees with the number-type specified by the next 4 bits of fclass9.

Note: A fclass9 of 0x1FF is equivalent to testing for any supported operand.

Related Topics:

fabs - Floating-point Absolute Value Instruction

fadd - Floating-point Add Instruction

famax - Floating-point Absolute Maximum Instruction

famin - Floating-point Absolute Minimum Instruction

fchkf - Floating-point Check Flags Instruction

fclrf - Floating-point Clear Flags Instruction

fcmp - Floating-point Compare Instruction

fcvt.xf - Convert Signed Integer to Floating-point Instruction

fcvt.xuf - Convert Unsigned Integer to Floating-point Instruction

Floating-Point Arithmetic Instructions

Floating-Point Instructions

Floating-Point Memory Access Instructions

Floating-Point Non-Arithmetic Instructions

Floating-Point Pseudo-Operations

Floating-Point Register Transfer Instructions

Floating-Point Status Register (FPSR) Status Field Instructions

fma - Floating-point Multiply Add Instruction

fmax - Floating-point Maximum Instruction

fmerge - Floating-point Merge Instruction

fmin - Floating-point Minimum Instruction

fmix - Floating-point Mix Instruction

fmpy - Floating-point Multiply Instruction

fms - Floating-point Multiply Subtract Instruction

fneg - Floating-point Negate Instruction

fnegabs - Floating-point Negate Absolute Value Instruction

fnma - Floating-point Negative Multiply Add Instruction

fnmpy - Floating-point Negative Multiply Instruction

fnorm - Floating-point Normalize Instruction

for - Floating-point OR Instruction

fpabs - Floating-point Parallel Absolute Value Instruction

fpack - Floating-point Pack Instruction

fpamax - Floating-point Parallel Absolute Value Maximum Instruction

fpamin - Floating-point Parallel Absolute Value Minimum Instruction

fpcmp - Floating-point Parallel Compare Instruction

fpcvt.fx - Convert Parallel Floating-point to Integer Instruction

fpma - Floating-point Parallel Multiply Add Instruction

fpmax - Floating-point Parallel Maximum Instruction

fpmerge - Floating-point Parallel Merge Instructions

fpmin - Floating-point Parallel Minimum Instruction

fpmpy - Floating-point Parallel Multiply Instruction

fpms - Floating-point Parallel Multiply Subtract Instruction

fpneg - Floating-point Parallel Negate Instruction

fpnegabs - Floating-point Parallel Negate Absolute Value Instruction

fpnma - Floating-point Parallel Negative Multiply Add Instruction

fpnmpy - Floating-point Parallel Negative Multiply Instruction

fprcpa - Floating-point Parallel Reciprocal Approximation Instruction

fprsqrta - Floating-point Parallel Reciprocal Square Root Approximation Instruction

frcpa - Floating-point Reciprocal Approximation Instruction

frsqrta - Floating-point Reciprocal Square Root Approximation Instruction

fselect - Floating-point Select Instruction

fsetc - Floating-point Set Controls Instruction

fsub - Floating-point Subtract Instruction

fswap - Floating-point Swap Instruction

fsxt - Floating-point Sign Extend Instruction

fwb - Flush Write Buffers Instruction

fxor - Floating-point Exclusive Or Instruction

getf - Get Floating-point Value or Exponent or Significand Instruction

Integer Multiply and Add (in FP Unit) Instructions

ldf - Floating-point Load Instruction

ldfp - Floating-point Load Pair Instruction

mov fr - Move Floating-point Register Instruction

psad1 - Parallel Sum of Absolute Difference Instruction

setf - Set Floating-point Value, Exponent, or Significand Instruction

stf - Floating-point Store Instruction