[llvm] [LoongArch] Add areInlineCompatible (PR #117144)

[Nikita Popov via llvm-commits]

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@@ -19,6 +19,20 @@ using namespace llvm;
 
 #define DEBUG_TYPE "loongarchtti"
 
+bool LoongArchTTIImpl::areInlineCompatible(const Function *Caller,
+                                           const Function *Callee) const {
+  const TargetMachine &TM = getTLI()->getTargetMachine();
+
+  const FeatureBitset &CallerBits =
+      TM.getSubtargetImpl(*Caller)->getFeatureBits();
+  const FeatureBitset &CalleeBits =
+      TM.getSubtargetImpl(*Callee)->getFeatureBits();
+
+  // Inline a callee if its target-features are a subset of the callers
+  // target-features.
+  return (CallerBits & CalleeBits) == CalleeBits;
+}
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nikic wrote:

Can we make this the default implementation? I think every target copies some variant of this...

https://github.com/llvm/llvm-project/pull/117144