[llvm-branch-commits] [llvm] AMDGPU: Use RegClassByHwMode to manage operand VGPR operand constraints (PR #158272)

[Christudasan Devadasan via llvm-branch-commits]

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@@ -2926,6 +2929,20 @@ def HasLdsBarrierArriveAtomic : Predicate<"Subtarget->hasLdsBarrierArriveAtomic(
 def HasSetPrioIncWgInst : Predicate<"Subtarget->hasSetPrioIncWgInst()">,
  AssemblerPredicate<(all_of FeatureSetPrioIncWgInst)>;
 
+def NeedsAlignedVGPRs : Predicate<"Subtarget->needsAlignedVGPRs()">,
+                      AssemblerPredicate<(all_of FeatureRequiresAlignedVGPRs)>;
+
+//===----------------------------------------------------------------------===//
+// HwModes
+//===----------------------------------------------------------------------===//
+
+// gfx90a-gfx950. Has AGPRs, and also the align2 VGPR/AGPR requirement
+def AVAlign2LoadStoreMode : HwMode<[HasMAIInsts, NeedsAlignedVGPRs]>;
+
+// gfx1250, has alignment requirement but no AGPRs.
+def AlignedVGPRNoAGPRMode : HwMode<[NotHasMAIInsts, NeedsAlignedVGPRs]>;
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cdevadas wrote:

What will be the Mode for gfx908 that has AGPRs but no strict VGPR align requirement?

https://github.com/llvm/llvm-project/pull/158272