(old) | htmldiff from- | (new) |
Unsigned multiply-subtract long from accumulator (bottom, indexed).
Multiply the even-numbered unsigned elements within each 128-bit segment of the first source vector by the specified unsigned element in the corresponding second source vector segment and destructively subtract from the overlapping double-width elements of the addend vector.
The elements within the second source vector are specified using an immediate index which selects the same element position within each 128-bit vector segment. The index range is from 0 to one less than the number of elements per 128-bit segment, encoded in 2 or 3 bits depending on the size of the element.
It has encodings from 2 classes: 32-bit and 64-bit
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | i3h | Zm | 1 | 0 | 1 | 1 | i3l | 0 | Zn | Zda |
if !HaveSVE2() then UNDEFINED; integer esize = 16; integer index = UInt(i3h:i3l); integer n = UInt(Zn); integer m = UInt(Zm); integer da = UInt(Zda); integer sel = 0;
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | i2h | Zm | 1 | 0 | 1 | 1 | i2l | 0 | Zn | Zda |
if !HaveSVE2() then UNDEFINED; integer esize = 32; integer index = UInt(i2h:i2l); integer n = UInt(Zn); integer m = UInt(Zm); integer da = UInt(Zda); integer sel = 0;
<Zda> | Is the name of the third source and destination scalable vector register, encoded in the "Zda" field. |
<Zn> | Is the name of the first source scalable vector register, encoded in the "Zn" field. |
CheckSVEEnabledCheckSVEEnabled();
integer elements = VL DIV (2 * esize);
integer eltspersegment = 128 DIV (2 * esize);
bits(VL) operand1 = Z[n];
bits(VL) operand2 = Z[m];
bits(VL) result = Z[da];
for e = 0 to elements-1
integer s = e - e MOD eltspersegment;
integer element1 =();
integer elements = VL DIV (2 * esize);
integer eltspersegment = 128 DIV (2 * esize);
bits(VL) operand1 = Z[n];
bits(VL) operand2 = Z[m];
bits(VL) result = Z[da];
for e = 0 to elements-1
integer s = e - e MOD eltspersegment;
integer element1 = UInt(Elem[operand1, 2 * e + sel, esize]);
integer element2 = UInt(Elem[operand2, 2 * s + index, esize]);
bits(2*esize) product = (element1 * element2)<2*esize-1:0>; integer element3 =
UInt(Elem[result, e, 2*esize] =[result, e, 2*esize]);
integer res = element3 - element1 * element2; Elem[result, e, 2*esize] = res<2*esize-1:0>;
Z[result, e, 2*esize] - product;
Z[da] = result;[da] = result;
If PSTATE.DIT is 1:
This instruction might be immediately preceded in program order by a MOVPRFX instruction.instruction Thethat conforms to all of the following requirements, otherwise the behavior of either or both instructions is MOVPRFXunpredictable instruction must conform to all of the following requirements, otherwise the behavior of the:
Internal version only: isa v31.05bv31.04, AdvSIMD v29.02, pseudocode v2019-12_rc3_1v2019-09_rc2_1, sve v2019-12_rc3v2019-09_rc3
; Build timestamp: 2019-12-13T112019-09-27T17:0228
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