[llvm-branch-commits] [llvm] AMDGPU: Add statistic for number of MFMAs moved to AGPR form (PR #153024)

[Matt Arsenault via llvm-branch-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/153024

None

>From 0dff2435e57be1d62ba79aa385e7d023c5c975de Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Mon, 11 Aug 2025 19:00:54 +0900
Subject: [PATCH] AMDGPU: Add statistic for number of MFMAs moved to AGPR form

---
 llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp b/llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp
index b71c70db5e6b3..c4a370225b606 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp
@@ -26,6 +26,7 @@
 #include "GCNSubtarget.h"
 #include "SIMachineFunctionInfo.h"
 #include "SIRegisterInfo.h"
+#include "llvm/ADT/Statistic.h"
 #include "llvm/CodeGen/LiveIntervals.h"
 #include "llvm/CodeGen/LiveRegMatrix.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
@@ -38,6 +39,9 @@ using namespace llvm;
 
 namespace {
 
+STATISTIC(NumMFMAsRewrittenToAGPR,
+          "Number of MFMA instructions rewritten to use AGPR form");
+
 class AMDGPURewriteAGPRCopyMFMAImpl {
   MachineFunction &MF;
   const GCNSubtarget &ST;
@@ -261,6 +265,7 @@ bool AMDGPURewriteAGPRCopyMFMAImpl::tryReassigningMFMAChain(
     int NewMFMAOp =
         AMDGPU::getMFMASrcCVDstAGPROp(RewriteCandidate->getOpcode());
     RewriteCandidate->setDesc(TII.get(NewMFMAOp));
+    ++NumMFMAsRewrittenToAGPR;
   }
 
   return true;