RM0004 Datasheet, PDF(496/1176 Page) STMicroelectronics – Programmer’s reference manual for Book E processors

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RM0004 Datasheet, PDF (496/1176 Pages) STMicroelectronics – Programmer’s reference manual for Book E processors

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RM0004

Instruction set

evfscmpeq

Vector SPFP APU User

Vector floating-point single-precision compare equal

evfscmpeq

crfD,rA,rB

evfscmpeq

0

56

8 9 10 11

15 16

20 21

31

0 0 0 1 0 0 crfD 0 0

rA

rB

010 1000 1110

ah â rA0:31

al â rA32:63

bh â rB0:31

bl â rB32:63

if (ah = bh) then ch â 1

else ch â 0

if (al = bl) then cl â 1

else cl â 0

CR4*crD:4*crD+3 â ch || cl || (ch | cl) || (ch & cl)

Each element of rA is compared against the corresponding element of rB. If rA equals rB,

the crfD bit is set, otherwise it is cleared. Comparison ignores the sign of 0 (+0 = â0).

Exceptions:

If the contents of either element of rA or rB are Infinity, Denorm, or NaN,

SPEFSCR[FINV,FINVH] are set appropriately, and SPEFSCR[FGH,FXH,FG,FX] are

cleared appropriately. If floating-point invalid input exceptions are enabled, an interrupt is

taken, and the condition register is not updated. Otherwise, the comparison proceeds after

treating NaNs, Infinities, and Denorms as normalized numbers, using their values of âeâ and

âfâ directly.

496/1176

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