[llvm] [AArch64] Neoverse V1 scheduling info (PR #126707)

[Ash Dobrescu via llvm-commits]

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@@ -66,6 +66,11 @@ def V1UnitV   : ProcResGroup<[V1UnitV0, V1UnitV1,
 def V1UnitV01 : ProcResGroup<[V1UnitV0, V1UnitV1]>;   // FP/ASIMD 0/1 units
 def V1UnitV02 : ProcResGroup<[V1UnitV0, V1UnitV2]>;   // FP/ASIMD 0/2 units
 def V1UnitV13 : ProcResGroup<[V1UnitV1, V1UnitV3]>;   // FP/ASIMD 1/3 units
+// Select V0 + V2 or V1 + V3 by issuing 2 micro operations
+def V1UnitSVE01 : ProcResGroup<[V1UnitV0, V1UnitV1,   // FP/ASIMD 0,2/1,3 units
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Rin18 wrote:

>My understanding is that SVE instructions reserve V0+V2 or V1+V3.

For units V0+V2 and V1+V3 there already exists `V1UnitV02` and `V1UnitV13`. And if you want to use V1+V2+V3+V4 there exists `V1UnitV`. The resource `V1UnitSVE01` looks to be the same as `V1UnitV`. Why not use the existing V unit groups as David mentioned?

https://github.com/llvm/llvm-project/pull/126707