[llvm] fdede21 - AMDGPU: Add statistic for number of MFMAs moved to AGPR form (#153024)

[via llvm-commits]

Author: Matt Arsenault
Date: 2025-09-03T05:44:25Z
New Revision: fdede21ddf05d72ce752bf03920d533e0800354b

URL: https://github.com/llvm/llvm-project/commit/fdede21ddf05d72ce752bf03920d533e0800354b
DIFF: https://github.com/llvm/llvm-project/commit/fdede21ddf05d72ce752bf03920d533e0800354b.diff

LOG: AMDGPU: Add statistic for number of MFMAs moved to AGPR form (#153024)

Added: 
    

Modified: 
    llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp b/llvm/lib/Target/AMDGPU/AMDGPURewriteAGPRCopyMFMA.cpp
index aaecfa1e33f06..5468bdd81cd98 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;
@@ -255,6 +259,7 @@ bool AMDGPURewriteAGPRCopyMFMAImpl::tryReassigningMFMAChain(
     int NewMFMAOp =
         AMDGPU::getMFMASrcCVDstAGPROp(RewriteCandidate->getOpcode());
     RewriteCandidate->setDesc(TII.get(NewMFMAOp));
+    ++NumMFMAsRewrittenToAGPR;
   }
 
   return true;