[llvm] Account for inline assembly instructions in inlining cost. (PR #146628)

[Mingming Liu via llvm-commits]

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@@ -777,6 +786,42 @@ class InlineCostCallAnalyzer final : public CallAnalyzer {
 
     addCost(SwitchCost);
   }
+
+  // Parses the inline assembly argument to account for its cost. Inline
+  // assembly instructions incur higher costs for inlining since they cannot be
+  // analyzed and optimized.
+  void onInlineAsm(InlineAsm &Arg) override {
+    SmallVector<StringRef, 4> Fragments;
+    Arg.getAsmString().split(Fragments, "\n");
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mingmingl-llvm wrote:

nit: use `InlineAsm::collectAsmStrs` at https://github.com/llvm/llvm-project/blob/988876cdd918d5b945a072a3d643b5fa22ae2917/llvm/lib/IR/InlineAsm.cpp#L63

https://github.com/llvm/llvm-project/pull/146628