diff --git a/deps/LLVMExtra/include/LLVMExtra.h b/deps/LLVMExtra/include/LLVMExtra.h
index 453dbfec..5a00faec 100644
--- a/deps/LLVMExtra/include/LLVMExtra.h
+++ b/deps/LLVMExtra/include/LLVMExtra.h
@@ -254,11 +254,17 @@ void LLVMPassBuilderExtensionsRegisterFunctionPass(LLVMPassBuilderExtensionsRef
                                                    const char *PassName,
                                                    LLVMJuliaFunctionPassCallback Callback,
                                                    void *Thunk);
+#if LLVM_VERSION_MAJOR < 20
 void LLVMPassBuilderExtensionsSetAAPipeline(LLVMPassBuilderExtensionsRef Extensions,
                                             const char *AAPipeline);
+#endif
 LLVMErrorRef LLVMRunJuliaPasses(LLVMModuleRef M, const char *Passes,
                                 LLVMTargetMachineRef TM, LLVMPassBuilderOptionsRef Options,
                                 LLVMPassBuilderExtensionsRef Extensions);
+LLVMErrorRef LLVMRunJuliaPassesOnFunction(LLVMValueRef F, const char *Passes,
+                                          LLVMTargetMachineRef TM,
+                                          LLVMPassBuilderOptionsRef Options,
+                                          LLVMPassBuilderExtensionsRef Extensions);
 
 LLVMValueRef LLVMBuildAtomicRMWSyncScope(LLVMBuilderRef B,LLVMAtomicRMWBinOp op,
                                          LLVMValueRef PTR, LLVMValueRef Val,
diff --git a/deps/LLVMExtra/lib/NewPM.cpp b/deps/LLVMExtra/lib/NewPM.cpp
index 0bed1f57..2b765698 100644
--- a/deps/LLVMExtra/lib/NewPM.cpp
+++ b/deps/LLVMExtra/lib/NewPM.cpp
@@ -145,16 +145,12 @@ void LLVMPassBuilderExtensionsSetAAPipeline(LLVMPassBuilderExtensionsRef Extensi
 
 // Vendored API entrypoint
 
-LLVMErrorRef LLVMRunJuliaPasses(LLVMModuleRef M, const char *Passes,
-                                LLVMTargetMachineRef TM, LLVMPassBuilderOptionsRef Options,
-                                LLVMPassBuilderExtensionsRef Extensions) {
-  TargetMachine *Machine = unwrap(TM);
-  LLVMPassBuilderOptions *PassOpts = unwrap(Options);
-  LLVMPassBuilderExtensions *PassExts = unwrap(Extensions);
+static LLVMErrorRef runJuliaPasses(Module *Mod, Function *Fun, const char *Passes,
+                                   TargetMachine *Machine, LLVMPassBuilderOptions *PassOpts,
+                                   LLVMPassBuilderExtensions *PassExts) {
   bool Debug = PassOpts->DebugLogging;
   bool VerifyEach = PassOpts->VerifyEach;
 
-  Module *Mod = unwrap(M);
   PassInstrumentationCallbacks PIC;
 #if LLVM_VERSION_MAJOR >= 16
   PassBuilder PB(Machine, PassOpts->PTO, std::nullopt, &PIC);
@@ -203,14 +199,43 @@ LLVMErrorRef LLVMRunJuliaPasses(LLVMModuleRef M, const char *Passes,
 #else
   SI.registerCallbacks(PIC, &FAM);
 #endif
-  ModulePassManager MPM;
-  if (VerifyEach) {
-    MPM.addPass(VerifierPass());
-  }
-  if (auto Err = PB.parsePassPipeline(MPM, Passes)) {
-    return wrap(std::move(Err));
+
+  if (Fun) {
+    FunctionPassManager FPM;
+    if (VerifyEach)
+      FPM.addPass(VerifierPass());
+    if (auto Err = PB.parsePassPipeline(FPM, Passes))
+      return wrap(std::move(Err));
+    FPM.run(*Fun, FAM);
+  } else {
+    ModulePassManager MPM;
+    if (VerifyEach)
+      MPM.addPass(VerifierPass());
+    if (auto Err = PB.parsePassPipeline(MPM, Passes))
+      return wrap(std::move(Err));
+    MPM.run(*Mod, MAM);
   }
 
-  MPM.run(*Mod, MAM);
   return LLVMErrorSuccess;
 }
+
+LLVMErrorRef LLVMRunJuliaPasses(LLVMModuleRef M, const char *Passes,
+                                LLVMTargetMachineRef TM, LLVMPassBuilderOptionsRef Options,
+                                LLVMPassBuilderExtensionsRef Extensions) {
+  TargetMachine *Machine = unwrap(TM);
+  LLVMPassBuilderOptions *PassOpts = unwrap(Options);
+  LLVMPassBuilderExtensions *PassExts = unwrap(Extensions);
+  Module *Mod = unwrap(M);
+  return runJuliaPasses(Mod, nullptr, Passes, Machine, PassOpts, PassExts);
+}
+
+LLVMErrorRef LLVMRunJuliaPassesOnFunction(LLVMValueRef F, const char *Passes,
+                                          LLVMTargetMachineRef TM,
+                                          LLVMPassBuilderOptionsRef Options,
+                                          LLVMPassBuilderExtensionsRef Extensions) {
+  TargetMachine *Machine = unwrap(TM);
+  LLVMPassBuilderOptions *PassOpts = unwrap(Options);
+  LLVMPassBuilderExtensions *PassExts = unwrap(Extensions);
+  Function *Fun = unwrap<Function>(F);
+  return runJuliaPasses(Fun->getParent(), Fun, Passes, Machine, PassOpts, PassExts);
+}
diff --git a/lib/15/libLLVM_extra.jl b/lib/15/libLLVM_extra.jl
index 45eeb9fb..180545fc 100644
--- a/lib/15/libLLVM_extra.jl
+++ b/lib/15/libLLVM_extra.jl
@@ -385,6 +385,10 @@ function LLVMRunJuliaPasses(M, Passes, TM, Options, Extensions)
     ccall((:LLVMRunJuliaPasses, libLLVMExtra), LLVMErrorRef, (LLVMModuleRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), M, Passes, TM, Options, Extensions)
 end
 
+function LLVMRunJuliaPassesOnFunction(F, Passes, TM, Options, Extensions)
+    ccall((:LLVMRunJuliaPassesOnFunction, libLLVMExtra), LLVMErrorRef, (LLVMValueRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), F, Passes, TM, Options, Extensions)
+end
+
 function LLVMBuildAtomicRMWSyncScope(B, op, PTR, Val, ordering, syncscope)
     ccall((:LLVMBuildAtomicRMWSyncScope, libLLVMExtra), LLVMValueRef, (LLVMBuilderRef, LLVMAtomicRMWBinOp, LLVMValueRef, LLVMValueRef, LLVMAtomicOrdering, Cstring), B, op, PTR, Val, ordering, syncscope)
 end
diff --git a/lib/16/libLLVM_extra.jl b/lib/16/libLLVM_extra.jl
index 45eeb9fb..180545fc 100644
--- a/lib/16/libLLVM_extra.jl
+++ b/lib/16/libLLVM_extra.jl
@@ -385,6 +385,10 @@ function LLVMRunJuliaPasses(M, Passes, TM, Options, Extensions)
     ccall((:LLVMRunJuliaPasses, libLLVMExtra), LLVMErrorRef, (LLVMModuleRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), M, Passes, TM, Options, Extensions)
 end
 
+function LLVMRunJuliaPassesOnFunction(F, Passes, TM, Options, Extensions)
+    ccall((:LLVMRunJuliaPassesOnFunction, libLLVMExtra), LLVMErrorRef, (LLVMValueRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), F, Passes, TM, Options, Extensions)
+end
+
 function LLVMBuildAtomicRMWSyncScope(B, op, PTR, Val, ordering, syncscope)
     ccall((:LLVMBuildAtomicRMWSyncScope, libLLVMExtra), LLVMValueRef, (LLVMBuilderRef, LLVMAtomicRMWBinOp, LLVMValueRef, LLVMValueRef, LLVMAtomicOrdering, Cstring), B, op, PTR, Val, ordering, syncscope)
 end
diff --git a/lib/17/libLLVM_extra.jl b/lib/17/libLLVM_extra.jl
index 69290063..74bcb0f0 100644
--- a/lib/17/libLLVM_extra.jl
+++ b/lib/17/libLLVM_extra.jl
@@ -345,6 +345,10 @@ function LLVMRunJuliaPasses(M, Passes, TM, Options, Extensions)
     ccall((:LLVMRunJuliaPasses, libLLVMExtra), LLVMErrorRef, (LLVMModuleRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), M, Passes, TM, Options, Extensions)
 end
 
+function LLVMRunJuliaPassesOnFunction(F, Passes, TM, Options, Extensions)
+    ccall((:LLVMRunJuliaPassesOnFunction, libLLVMExtra), LLVMErrorRef, (LLVMValueRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), F, Passes, TM, Options, Extensions)
+end
+
 function LLVMBuildAtomicRMWSyncScope(B, op, PTR, Val, ordering, syncscope)
     ccall((:LLVMBuildAtomicRMWSyncScope, libLLVMExtra), LLVMValueRef, (LLVMBuilderRef, LLVMAtomicRMWBinOp, LLVMValueRef, LLVMValueRef, LLVMAtomicOrdering, Cstring), B, op, PTR, Val, ordering, syncscope)
 end
diff --git a/lib/18/libLLVM_extra.jl b/lib/18/libLLVM_extra.jl
index d0ba92a4..04629305 100644
--- a/lib/18/libLLVM_extra.jl
+++ b/lib/18/libLLVM_extra.jl
@@ -279,6 +279,10 @@ function LLVMRunJuliaPasses(M, Passes, TM, Options, Extensions)
     ccall((:LLVMRunJuliaPasses, libLLVMExtra), LLVMErrorRef, (LLVMModuleRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), M, Passes, TM, Options, Extensions)
 end
 
+function LLVMRunJuliaPassesOnFunction(F, Passes, TM, Options, Extensions)
+    ccall((:LLVMRunJuliaPassesOnFunction, libLLVMExtra), LLVMErrorRef, (LLVMValueRef, Cstring, LLVMTargetMachineRef, LLVMPassBuilderOptionsRef, LLVMPassBuilderExtensionsRef), F, Passes, TM, Options, Extensions)
+end
+
 function LLVMBuildAtomicRMWSyncScope(B, op, PTR, Val, ordering, syncscope)
     ccall((:LLVMBuildAtomicRMWSyncScope, libLLVMExtra), LLVMValueRef, (LLVMBuilderRef, LLVMAtomicRMWBinOp, LLVMValueRef, LLVMValueRef, LLVMAtomicOrdering, Cstring), B, op, PTR, Val, ordering, syncscope)
 end
diff --git a/src/newpm.jl b/src/newpm.jl
index de3279bb..e63b399b 100644
--- a/src/newpm.jl
+++ b/src/newpm.jl
@@ -247,7 +247,7 @@ represents a pass pipeline. The target machine is used to optimize the passes.
 """
 run!
 
-function run!(pb::NewPMPassBuilder, mod::Module, tm::Union{Nothing,TargetMachine}=nothing)
+function run!(pb::NewPMPassBuilder, target::Union{Module,Function}, tm::Union{Nothing,TargetMachine}=nothing)
     isempty(pb.passes) && return
     pipeline = join(pb.passes, ",")
     aa_pipeline = join(pb.aa_passes, ",")
@@ -286,8 +286,13 @@ function run!(pb::NewPMPassBuilder, mod::Module, tm::Union{Nothing,TargetMachine
             end
         end
 
-        @check API.LLVMRunJuliaPasses(mod, pipeline, something(tm, C_NULL),
-                                      pb.opts, pb.exts)
+        if target isa Module
+            @check API.LLVMRunJuliaPasses(target, pipeline, something(tm, C_NULL),
+                                          pb.opts, pb.exts)
+        elseif target isa Function
+            @check API.LLVMRunJuliaPassesOnFunction(target, pipeline, something(tm, C_NULL),
+                                                    pb.opts, pb.exts)
+        end
     end
 end
 
diff --git a/test/newpm_tests.jl b/test/newpm_tests.jl
index 42fc4e4e..05d5b06d 100644
--- a/test/newpm_tests.jl
+++ b/test/newpm_tests.jl
@@ -23,14 +23,19 @@ end
     @dispose ctx=Context() begin
         # single pass
         @dispose mod=test_module() begin
+            fun = only(functions(mod))
+
             # by string
             @test run!("no-op-module", mod) === nothing
+            @test run!("no-op-function", fun) === nothing
 
             # by object
             @test run!(NoOpModulePass(), mod) === nothing
+            @test run!(NoOpFunctionPass(), fun) === nothing
 
             # by object with options
             @test run!(LoopExtractorPass(; single=true), mod) === nothing
+            @test run!(EarlyCSEPass(; memssa=true), fun) === nothing
         end
 
         # default pipelines