Dot Product signed arithmetic (vector). This instruction performs the dot product of the four signed 8-bit elements in each 32-bit element of the first source register with the four signed 8-bit elements of the corresponding 32-bit element in the second source register, accumulating the result into the corresponding 32-bit element of the destination register.
Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.
From Armv8.2, this is an optional instruction.
ID_AA64ISAR0_EL1.DP indicates whether this instruction is supported.
| 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 | Q | 0 | 0 | 1 | 1 | 1 | 0 | size | 0 | Rm | 1 | 0 | 0 | 1 | 0 | 1 | Rn | Rd | |||||||||||||
| U | |||||||||||||||||||||||||||||||
if !HaveDOTPExt() then UNDEFINED; if size!= '10' then UNDEFINED; boolean signed = (U=='0'); integer d = UInt(Rd); integer n = UInt(Rn); integer m = UInt(Rm); integer esize = 8 << UInt(size); integer datasize = if Q == '1' then 128 else 64; integer elements = datasize DIV esize;
| <Vd> |
Is the name of the SIMD&FP third source and destination register, encoded in the "Rd" field. |
| <Ta> |
Is an arrangement specifier,
encoded in
Q:
|
| <Vn> |
Is the name of the first SIMD&FP source register, encoded in the "Rn" field. |
| <Tb> |
Is an arrangement specifier,
encoded in
Q:
|
| <Vm> |
Is the name of the second SIMD&FP source register, encoded in the "Rm" field. |
CheckFPAdvSIMDEnabled64(); bits(datasize) operand1 = V[n]; bits(datasize) operand2 = V[m]; bits(datasize) result; result = V[d]; for e = 0 to elements-1 integer res = 0; integer element1, element2; for i = 0 to 3 if signed then element1 = SInt(Elem[operand1, 4 * e + i, esize DIV 4]); element2 = SInt(Elem[operand2, 4 * e + i, esize DIV 4]); else element1 = UInt(Elem[operand1, 4 * e + i, esize DIV 4]); element2 = UInt(Elem[operand2, 4 * e + i, esize DIV 4]); res = res + element1 * element2; Elem[result, e, esize] = Elem[result, e, esize] + res; V[d] = result;
Internal version only: isa v32.13, AdvSIMD v29.04, pseudocode morello-2022-01_rc2, capabilities morello-2022-01_rc2 ; Build timestamp: 2022-01-11T11:23
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