Reset NextFnNum in MachineModuleInfo::initialize

In an env that reuses compiler instances for multiple compilations, this
omission results in non-deterministic assembly output (names of the
auto-generated labels) if the order or full set of Modules compiled
varies.

Differential Revision: https://reviews.llvm.org/D100797

diff --git a/llvm/lib/CodeGen/MachineModuleInfo.cpp b/llvm/lib/CodeGen/MachineModuleInfo.cpp
index b436633..776b7f5 100644 (file)
--- a/llvm/lib/CodeGen/MachineModuleInfo.cpp
+++ b/llvm/lib/CodeGen/MachineModuleInfo.cpp
@@ -196,6 +196,7 @@ void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) {
 void MachineModuleInfo::initialize() {
   ObjFileMMI = nullptr;
   CurCallSite = 0;
+  NextFnNum = 0;
   UsesMSVCFloatingPoint = UsesMorestackAddr = false;
   HasSplitStack = HasNosplitStack = false;
   AddrLabelSymbols = nullptr;