[llvm-branch-commits] [clang] [Clang][LTO][AMDGPU] start using new pass manager for backend codegen (PR #210250)

[Vikram Hegde via llvm-branch-commits]

https://github.com/vikramRH created https://github.com/llvm/llvm-project/pull/210250

None

>From f6ff8c02a6b966a028e58fc286da6e91ac71eb45 Mon Sep 17 00:00:00 2001
From: vikhegde <vikram.hegde at amd.com>
Date: Thu, 16 Jul 2026 16:27:28 +0530
Subject: [PATCH] [Clang][LTO][AMDGPU] start using new pass manager for backend
 codegen

---
 clang/lib/Driver/ToolChains/Clang.cpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index bdf72f848aeff..6eb368e1a4555 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5287,6 +5287,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     }
   }
 
+  if (getToolChain().getTriple().isAMDGCN()) {
+    if (Args.hasFlag(options::OPT_fenable_new_pm_codegen,
+                     options::OPT_fno_enable_new_pm_codegen, true)) {
+      CmdArgs.push_back(Args.MakeArgString("-fenable-new-pm-codegen"));
+    }
+  }
+
   if (IsCuda && !IsCudaDevice) {
     // We need to figure out which CUDA version we're compiling for, as that
     // determines how we load and launch GPU kernels.
@@ -9917,10 +9924,18 @@ void LinkerWrapper::ConstructJob(Compilation &C, const JobAction &JA,
 
       // Forward the LTO mode for this toolchain.
       auto DeviceLTOMode = TC->getLTOMode(ToolChainArgs, Kind);
-      if (DeviceLTOMode == LTOK_Full)
+      if (DeviceLTOMode == LTOK_Full) {
         CmdArgs.push_back(Args.MakeArgString(
             "--device-compiler=" + TC->getTripleString() + "=-flto=full"));
-      else if (DeviceLTOMode == LTOK_Thin) {
+
+        if (TC->getTriple().isAMDGCN() &&
+            Args.hasFlag(options::OPT_fenable_new_pm_codegen,
+                         options::OPT_fno_enable_new_pm_codegen, true)) {
+          CmdArgs.push_back(
+              Args.MakeArgString("--device-linker=" + TC->getTripleString() +
+                                 "=-plugin-opt=-enable-npm-for-backend"));
+        }
+      } else if (DeviceLTOMode == LTOK_Thin) {
         CmdArgs.push_back(Args.MakeArgString(
             "--device-compiler=" + TC->getTripleString() + "=-flto=thin"));
         if (TC->getTriple().isAMDGPU()) {