PTEST

Set condition flags for predicate.

Sets the First (N), None (Z), !Last (C) condition flags based on the predicate source register, and the V flag to zero.

313029282726252423222120191817161514131211109876543210
001001010101000011Pg0Pn00000

SVE

PTEST <Pg>, <Pn>.B

if !HaveSVE() then UNDEFINED; integer esize = 8; integer g = UInt(Pg); integer n = UInt(Pn);

Assembler Symbols

<Pg>

Is the name of the governing scalable predicate register, encoded in the "Pg" field.

<Pn>

Is the name of the source scalable predicate register, encoded in the "Pn" field.

Operation

CheckSVEEnabled(); bits(PL) mask = P[g]; bits(PL) result = P[n]; PSTATE.<N,Z,C,V> = PredTest(mask, result, esize);

Operational information

If PSTATE.DIT is 1:


Internal version only: isa v31.05b, AdvSIMD v29.02, pseudocode v2019-12_rc3_1, sve v2019-12_rc3 ; Build timestamp: 2019-12-13T11:35

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