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BIC, BICS (predicates)

Bitwise clear predicates.

Bitwise AND inverted active elements of the second source predicate with corresponding elements of the first source predicate and place the results in the corresponding elements of the destination predicate. Inactive elements in the destination predicate register are set to zero. Optionally sets the First (N), None (Z), !Last (C) condition flags based on the predicate result, and the V flag to zero.

It has encodings from 2 classes: Not setting the condition flags and Setting the condition flags

Not setting the condition flags

313029282726252423222120191817161514131211109876543210
001001010000Pm01Pg0Pn1Pd
S

BIC <Pd>.B, <Pg>/Z, <Pn>.B, <Pm>.B

if !HaveSVE() then UNDEFINED;
integer esize = 8;
integer g = UInt(Pg);
integer n = UInt(Pn);
integer m = UInt(Pm);
integer d = UInt(Pd);
boolean setflags = FALSE;

Setting the condition flags

313029282726252423222120191817161514131211109876543210
001001010100Pm01Pg0Pn1Pd
S

BICS <Pd>.B, <Pg>/Z, <Pn>.B, <Pm>.B

if !HaveSVE() then UNDEFINED;
integer esize = 8;
integer g = UInt(Pg);
integer n = UInt(Pn);
integer m = UInt(Pm);
integer d = UInt(Pd);
boolean setflags = TRUE;

Assembler Symbols

<Pd>

Is the name of the destination scalable predicate register, encoded in the "Pd" field.

<Pg>

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

<Pn>

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

<Pm>

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

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(PL) mask = P[g];
bits(PL) operand1 = P[n];
bits(PL) operand2 = P[m];
bits(PL) result;

for e = 0 to elements-1
    bit element1 = ElemP[operand1, e, esize];
    bit element2 = ElemP[operand2, e, esize];
    if ElemP[mask, e, esize] == '1' then
        ElemP[result, e, esize] = element1 AND (NOT element2);
    else
        ElemP[result, e, esize] = '0';

if setflags then
    PSTATE.<N,Z,C,V> = PredTest(mask, result, esize);
P[d] = result;