added PrintTAFn flag for autodiff

Signed-off-by: Karan Janthe <karanjanthe@gmail.com>

2 files changed, 22 insertions, 1 deletions

diff --git a/compiler/rustc_codegen_llvm/src/back/lto.rs b/compiler/rustc_codegen_llvm/src/back/lto.rs
index ee46b49a094..9c62244f3c9 100644
--- a/compiler/rustc_codegen_llvm/src/back/lto.rs
+++ b/compiler/rustc_codegen_llvm/src/back/lto.rs
@@ -587,7 +587,7 @@ fn thin_lto(
 }
 
 fn enable_autodiff_settings(ad: &[config::AutoDiff]) {
-    for &val in ad {
+    for val in ad {
         // We intentionally don't use a wildcard, to not forget handling anything new.
         match val {
             config::AutoDiff::PrintPerf => {
@@ -599,6 +599,10 @@ fn enable_autodiff_settings(ad: &[config::AutoDiff]) {
             config::AutoDiff::PrintTA => {
                 llvm::set_print_type(true);
             }
+            config::AutoDiff::PrintTAFn(fun) => {
+                llvm::set_print_type(true); // Enable general type printing
+                llvm::set_print_type_fun(&fun); // Set specific function to analyze
+            }
             config::AutoDiff::Inline => {
                 llvm::set_inline(true);
             }
diff --git a/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs
index 2ad39fc8538..b94716b89d6 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs
@@ -57,14 +57,19 @@ pub(crate) use self::Enzyme_AD::*;
 
 #[cfg(llvm_enzyme)]
 pub(crate) mod Enzyme_AD {
+    use std::ffi::{CString, c_char};
+
     use libc::c_void;
+
     unsafe extern "C" {
         pub(crate) fn EnzymeSetCLBool(arg1: *mut ::std::os::raw::c_void, arg2: u8);
+        pub(crate) fn EnzymeSetCLString(arg1: *mut ::std::os::raw::c_void, arg2: *const c_char);
     }
     unsafe extern "C" {
         static mut EnzymePrintPerf: c_void;
         static mut EnzymePrintActivity: c_void;
         static mut EnzymePrintType: c_void;
+        static mut EnzymeFunctionToAnalyze: c_void;
         static mut EnzymePrint: c_void;
         static mut EnzymeStrictAliasing: c_void;
         static mut looseTypeAnalysis: c_void;
@@ -86,6 +91,15 @@ pub(crate) mod Enzyme_AD {
             EnzymeSetCLBool(std::ptr::addr_of_mut!(EnzymePrintType), print as u8);
         }
     }
+    pub(crate) fn set_print_type_fun(fun_name: &str) {
+        let c_fun_name = CString::new(fun_name).unwrap();
+        unsafe {
+            EnzymeSetCLString(
+                std::ptr::addr_of_mut!(EnzymeFunctionToAnalyze),
+                c_fun_name.as_ptr() as *const c_char,
+            );
+        }
+    }
     pub(crate) fn set_print(print: bool) {
         unsafe {
             EnzymeSetCLBool(std::ptr::addr_of_mut!(EnzymePrint), print as u8);
@@ -132,6 +146,9 @@ pub(crate) mod Fallback_AD {
     pub(crate) fn set_print_type(print: bool) {
         unimplemented!()
     }
+    pub(crate) fn set_print_type_fun(fun_name: &str) {
+        unimplemented!()
+    }
     pub(crate) fn set_print(print: bool) {
         unimplemented!()
     }