pfalse

SVE Initialize Predicate to False

PFALSE <Pd>.B

Clears all elements of the predicate register.

Pseudocode Operation

for i = 0 to (VL / 8 - 1):
  Pd[i] ← 0

Example

PFALSE p0.B

Encoding

Binary Layout

00100101

31:24

0

23

0

22

011000111001

21:10

000000

9:4

Pd

3:0

 

Format SVE Predicate

Opcode 0x2518E400

Extension SVE

Operands

• Pd
  Destination predicate register (SVE)

Related

More in SVE

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x2518E400	PFALSE <Pd>.B		A64		00100101 | 0 | 0 | 011000111001 | 000000 | Pd

Description

Set all elements in the destination predicate to false. For programmer convenience, an assembler must also accept predicate-as-counter register name for the destination predicate register.

Operation

CheckSVEEnabled();
constant integer VL = CurrentVL;
constant integer PL = VL DIV 8;
P[d, PL] = Zeros(PL);