(old) | htmldiff from- | (new) |
Signed Multiply-Subtract Long multiplies two 32-bit register values, subtracts the product from a 64-bit register value, and writes the result to the 64-bit destination register.
This instruction is used by the alias SMNEGL.
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 |
1 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | Rm | 1 | Ra | Rn | Rd | ||||||||||||||||
U | o0 |
integer d = UInt(Rd);
integer n = UInt(Rn);
integer m = UInt(Rm);
integer a = UInt(Ra);(Ra);
integer destsize = 64;
integer datasize = 32;
boolean sub_op = (o0 == '1');
boolean unsigned = (U == '1');
<Xd> | Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
<Wn> | Is the 32-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field. |
<Wm> | Is the 32-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field. |
<Xa> | Is the 64-bit name of the third general-purpose source register holding the minuend, encoded in the "Ra" field. |
Alias | Is preferred when |
---|---|
SMNEGL | Ra == '11111' |
bits(32) operand1 =bits(datasize) operand1 = X[n];
bits(32) operand2 =bits(datasize) operand2 = X[m];
bits(64) operand3 =bits(destsize) operand3 = X[a];
integer result;
result =if sub_op then
result = Int(operand3, FALSE) - ((operand3, unsigned) - (Int(operand1, FALSE) *(operand1, unsigned) * Int(operand2, FALSE));(operand2, unsigned));
else
result =
Int(operand3, unsigned) + (Int(operand1, unsigned) * Int(operand2, unsigned));
X[d] = result<63:0>;
If PSTATE.DIT is 1:
Internal version only: isa v30.41, AdvSIMD v27.08, pseudocode r8p5_00bet2_rc5, sve v8.5-00bet10_rc5
; Build timestamp: 2019-03-28T072019-03-28T06:1434
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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