[llvm] [AMDGPU] Use a single SubtargetPredicate for fp8/bf8 -> f32 conversions (PR #212888)

[Dmitry Sidorov via llvm-commits]

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@@ -2900,6 +2895,41 @@ def NotHasMAIInsts : Predicate<"!Subtarget->hasMAIInsts()">,
 def NotHasFP8E5M3Insts : Predicate<"!Subtarget->hasFP8E5M3Insts()">,
   AssemblerPredicate<(all_of (not FeatureFP8E5M3Insts))>;
 
+// The fp8/bf8 to f32 conversions have three mutually exclusive encodings, so
+// each predicate below covers the instructions and the encoding together.
+def HasFP8ConversionInstsGFX9 :
+  Predicate<"Subtarget->hasFP8ConversionInsts() &&"
+            " Subtarget->getGeneration() == AMDGPUSubtarget::GFX9">,
+  AssemblerPredicate<(all_of FeatureFP8ConversionInsts, FeatureGCN3Encoding,
+                             FeatureGFX9Insts)>;
+
+def HasFP8ConversionInstsGFX9NoVOP1Bug :
+  Predicate<"Subtarget->hasFP8ConversionInsts() &&"
+            " Subtarget->getGeneration() == AMDGPUSubtarget::GFX9 &&"
+            " !Subtarget->hasCvtFP8VOP1Bug()">,
+  AssemblerPredicate<(all_of FeatureFP8ConversionInsts, FeatureGCN3Encoding,
+                             FeatureGFX9Insts, (not FeatureCvtFP8VOP1Bug))>;
+
+def HasFP8ConversionInstsGFX11Plus :
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MrSidims wrote:

Addressed, thanks! Not sure if we want to give more descriptive name to VOP1Bug.

https://github.com/llvm/llvm-project/pull/212888