1 files changed, 103 insertions, 1 deletions
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index ff2ec388a5f..f338b914c67 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -1120,6 +1120,102 @@ extern "C" void LLVMRustPrintPasses() {
   PB.printPassNames(outs());
 }
 
+// from https://github.com/llvm/llvm-project/blob/7021182d6b43de9488ab70de626192ce70b3a4a6/llvm/lib/Object/IRSymtab.cpp#L48-L57
+static const char *PreservedLibcallSymbols[] = {
+#define HANDLE_LIBCALL(code, name) name,
+#include "llvm/IR/RuntimeLibcalls.def"
+#undef HANDLE_LIBCALL
+  // RuntimeLibcalls.def missing symbols.
+  "__ctzsi2",
+  "__ctzdi2",
+  "__ctzti2",
+  "__ffssi2",
+  "__ffsdi2",
+  "__ffsti2",
+  "__paritysi2",
+  "__paritydi2",
+  "__parityti2",
+  "__popcountsi2",
+  "__popcountdi2",
+  "__popcountti2",
+  "__bswapsi2",
+  "__bswapdi2",
+  "__negti2",
+  "__udivmoddi4",
+  "__udivmodti4",
+  "__udivmodsi4",
+  "__divmodsi4",
+  "__divmoddi4",
+  "__divmodti4",
+  "__absvsi2",
+  "__absvdi2",
+  "__absvti2",
+  "__negvsi2",
+  "__negvdi2",
+  "__negvti2",
+  "__addvsi3",
+  "__addvdi3",
+  "__addvti3",
+  "__subvsi3",
+  "__subvdi3",
+  "__subvti3",
+  "__mulvsi3",
+  "__mulvdi3",
+  "__mulvti3",
+  "__cmpdi2",
+  "__cmpti2",
+  "__ucmpdi2",
+  "__ucmpti2",
+  "__mulsc3",
+  "__muldc3",
+  "__mulxc3",
+  "__multc3",
+  "__divsc3",
+  "__divdc3",
+  "__divxc3",
+  "__divtc3",
+  "__clear_cache",
+  "__enable_execute_stack",
+  "__gcc_personality_v0",
+  "__eprintf",
+  "__emutls_get_address",
+  "__trampoline_setup",
+  "__addsf3vfp",
+  "__adddf3vfp",
+  "__divsf3vfp",
+  "__divdf3vfp",
+  "__eqsf2vfp",
+  "__eqdf2vfp",
+  "__extendsfdf2vfp",
+  "__fixdfsivfp",
+  "__fixsfsivfp",
+  "__fixunssfsivfp",
+  "__fixunsdfsivfp",
+  "__floatsidfvfp",
+  "__floatsisfvfp",
+  "__floatunssidfvfp",
+  "__floatunssisfvfp",
+  "__gedf2vfp",
+  "__gesf2vfp",
+  "__gtdf2vfp",
+  "__gtsf2vfp",
+  "__ledf2vfp",
+  "__lesf2vfp",
+  "__ltdf2vfp",
+  "__ltsf2vfp",
+  "__muldf3vfp",
+  "__mulsf3vfp",
+  "__nedf2vfp",
+  "__negdf2vfp",
+  "__negsf2vfp",
+  "__negsf2vfp",
+  "__subdf3vfp",
+  "__subsf3vfp",
+  "__truncdfsf2vfp",
+  "__unorddf2vfp",
+  "__unordsf2vfp",
+};
+
 extern "C" void LLVMRustRunRestrictionPass(LLVMModuleRef M, char **Symbols,
                                            size_t Len) {
   auto PreserveFunctions = [=](const GlobalValue &GV) {
@@ -1135,7 +1231,7 @@ extern "C" void LLVMRustRunRestrictionPass(LLVMModuleRef M, char **Symbols,
         return true;
       }
     }
-    return false;
+    return llvm::is_contained(PreservedLibcallSymbols, GV.getName());
   };
 
   internalizeModule(*unwrap(M), PreserveFunctions);
@@ -1293,6 +1389,12 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules,
     auto GUID = GlobalValue::getGUID(preserved_symbols[i]);
     Ret->GUIDPreservedSymbols.insert(GUID);
   }
+  for (int i = 0; i < sizeof(PreservedLibcallSymbols) / sizeof(PreservedLibcallSymbols[0]); i++) {
+    if (auto *PreservedLibcallSymbol = PreservedLibcallSymbols[i]) {
+      auto GUID = GlobalValue::getGUID(PreservedLibcallSymbol);
+      Ret->GUIDPreservedSymbols.insert(GUID);
+    }
+  }
 
   // Collect the import/export lists for all modules from the call-graph in the
   // combined index