[NFC][Clang][FMV] Make FMV priority data type future proof. (#150079)

FMV priority is the returned value of a polymorphic function. On RISC-V
and X86 targets a 32-bit value is enough. On AArch64 we currently need
64 bits and we will soon exceed that. APInt seems to be a suitable
replacement for uint64_t, presumably with minimal compile time overhead.
It allows bit manipulation, comparison and variable bit width.

1 files changed, 4 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 236cc3d..834b1c0 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -4418,8 +4418,9 @@ void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD, llvm::GlobalValue *GV) {
 static void ReplaceUsesOfNonProtoTypeWithRealFunction(llvm::GlobalValue *Old,
                                                       llvm::Function *NewFn);
 
-static uint64_t getFMVPriority(const TargetInfo &TI,
-                               const CodeGenFunction::FMVResolverOption &RO) {
+static llvm::APInt
+getFMVPriority(const TargetInfo &TI,
+               const CodeGenFunction::FMVResolverOption &RO) {
   llvm::SmallVector<StringRef, 8> Features{RO.Features};
   if (RO.Architecture)
     Features.push_back(*RO.Architecture);
@@ -4544,7 +4545,7 @@ void CodeGenModule::emitMultiVersionFunctions() {
     llvm::stable_sort(
         Options, [&TI](const CodeGenFunction::FMVResolverOption &LHS,
                        const CodeGenFunction::FMVResolverOption &RHS) {
-          return getFMVPriority(TI, LHS) > getFMVPriority(TI, RHS);
+          return getFMVPriority(TI, LHS).ugt(getFMVPriority(TI, RHS));
         });
     CodeGenFunction CGF(*this);
     CGF.EmitMultiVersionResolver(ResolverFunc, Options);