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Ftst test a floating-point operand ftst – Motorola DSP96002 User Manual

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DSP96002 USER’S MANUAL

MOTOROLA

FTST

Test a Floating-Point Operand

FTST

Operation:

S - 0 (parallel data bus move)

Assembler Syntax:

FTST S
(move syntax - see the Move instruction description.)

Description:

Compare the specified operand with zero. No result is stored, however, the condition codes are affected

as described.

Input Operand(s) Precision: SEP Floating-Point.

Output Operand Precision: n.a.

CCR Condition Codes:

Note: Since there is no destination, there is no rounding and therefore the condition code bits are set as-
suming an infinite precision result.

C

- Not affected.

V

- Not affected.

Z

- Set if result is zero. Cleared otherwise.

N

- Set if result is negative. Cleared otherwise.

I

- Set if result is infinity. Cleared otherwise.

LR

- Not affected.

R

- Not affected.

A

- Not affected.

ER Status Bits:

INX

-Always cleared.

DZ

-Always cleared.

UNF

-Always cleared.

OVF

-Always cleared.

OPERR-Always cleared.

SNAN -Set if operand is a signaling NaN. Cleared otherwise.

NAN

-Set if result is a NaN. Cleared otherwise.

UNCC -Always cleared.

IER Flags: Flags changed according to standard definition.