BFloat16 floating-point minimum (predicated)
Determine the minimum of active BFloat16 elements of the second source vector and corresponding BFloat16 elements of the first source vector and destructively place the results in the corresponding elements of the first source vector.
When FPCR.AH is 0, the behavior is as follows:
When FPCR.AH is 1, the behavior is as follows:
Inactive elements in the destination vector register remain unmodified.
This instruction follows SVE2 non-widening BFloat16 numerical behaviors.
ID_AA64ZFR0_EL1.B16B16 indicates whether this instruction is implemented.
| 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 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | Pg | Zm | Zdn | ||||||||||
| size<1> | size<0> | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE_B16B16) then UNDEFINED; constant integer g = UInt(Pg); constant integer dn = UInt(Zdn); constant integer m = UInt(Zm);
| <Zdn> |
Is the name of the first source and destination scalable vector register, encoded in the "Zdn" field. |
| <Pg> |
Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. |
| <Zm> |
Is the name of the second source scalable vector register, encoded in the "Zm" field. |
CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV 16; constant bits(PL) mask = P[g, PL]; constant bits(VL) operand1 = Z[dn, VL]; constant bits(VL) operand2 = if AnyActiveElement(mask, 16) then Z[m, VL] else Zeros(VL); bits(VL) result; for e = 0 to elements-1 constant bits(16) element1 = Elem[operand1, e, 16]; if ActivePredicateElement(mask, e, 16) then constant bits(16) element2 = Elem[operand2, e, 16]; Elem[result, e, 16] = BFMin(element1, element2, FPCR); else Elem[result, e, 16] = element1; Z[dn, VL] = result;
This instruction might be immediately preceded in program order by a MOVPRFX instruction. The MOVPRFX must conform to all of the following requirements, otherwise the behavior of the MOVPRFX and this instruction is constrained unpredictable:
Internal version only: aarchmrs v2024-03_relA, pseudocode v2024-03_rel, sve v2024-03_rel ; Build timestamp: 2024-03-26T09:45
Copyright © 2010-2024 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.