[PATCH] D111582: [clang] Clear IR analyses before codegen pipeline

[Arthur Eubanks via Phabricator via cfe-commits]

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This saves a tiny bit of memory in non-LTO builds [1].

[1] https://llvm-compile-time-tracker.com/compare.php?from=fbddf22ef72d3c2e9b14e1501841b03380eef12b&to=cd276df52eb6f2b84a8e1efe5318460c6debf82d&stat=max-rss


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111582

Files:
  clang/lib/CodeGen/BackendUtil.cpp


Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -1512,6 +1512,12 @@
 
   // Now if needed, run the legacy PM for codegen.
   if (NeedCodeGen) {
+    // Save some memory by clearing analyses used in the optimization pipeline.
+    LAM.clear();
+    FAM.clear();
+    CGAM.clear();
+    MAM.clear();
+
     PrettyStackTraceString CrashInfo("Code generation");
     CodeGenPasses.run(*TheModule);
   }


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