Gather statistics from MLx expansion passlinaro-local/ExpandMLx

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/Target/ARM/MLxExpansionPass.cpp b/lib/Target/ARM/MLxExpansionPass.cpp
index 76759c421e1..ac8baba9784 100644
--- a/lib/Target/ARM/MLxExpansionPass.cpp
+++ b/lib/Target/ARM/MLxExpansionPass.cpp
@@ -37,6 +37,9 @@ static cl::opt<bool>
 DisableMLxExpansion("disable-mlx-expansion", cl::init(false), cl::Hidden);
 
 STATISTIC(NumExpand, "Number of fp MLA / MLS instructions expanded");
+STATISTIC(VMLA_VMLA_Hazards, "Number of fp MLA / MLA hazards identified");
+STATISTIC(VMLA_VADD_Stalls, "Number of fp MLA / MADD stalls identified");
+STATISTIC(VMLA_VADD_Hazards, "Number of fp MLA / MADD hazards identified");
 
 namespace {
   struct MLxExpansion : public MachineFunctionPass {
@@ -230,6 +233,7 @@ bool MLxExpansion::FindMLxHazard(MachineInstr *MI) {
     // r3 = vadd r0, r4
     // takes about 14 - 15 cycles even with vmul stalling for 4 cycles.
     IgnoreStall.insert(DefMI);
+    ++VMLA_VMLA_Hazards;
     return true;
   }
 
@@ -256,13 +260,17 @@ bool MLxExpansion::FindMLxHazard(MachineInstr *MI) {
       continue;
 
     if (TII->canCauseFpMLxStall(NextMI->getOpcode())) {
-      if (i <= Limit1)
+      if (i <= Limit1) {
+        ++VMLA_VADD_Stalls;
         return true;
+      }
     }
 
     // Look for VMLx RAW hazard.
-    if (i <= Limit2 && hasRAWHazard(getDefReg(MI), NextMI))
+    if (i <= Limit2 && hasRAWHazard(getDefReg(MI), NextMI)) {
+      ++VMLA_VADD_Hazards;
       return true;
+    }
   }
 
   return false;