From 8293b7b8b1c4372095f86097da33f6cc63330289 Mon Sep 17 00:00:00 2001
From: Joel Jones <joel_k_jones@apple.com>
Date: Tue, 11 Dec 2012 16:10:25 +0000
Subject: Add comment for load folding

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169880 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/PeepholeOptimizer.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/CodeGen/PeepholeOptimizer.cpp')

diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp
index cc07d47150..0900ba3134 100644
--- a/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/lib/CodeGen/PeepholeOptimizer.cpp
@@ -49,6 +49,11 @@
 //     v1 = bitcast v0
 //        = v0
 //
+// - Optimize Loads:
+//
+//     Loads that can be folded into a later instruction. A load is foldable
+//     if it loads to virtual registers and the virtual register defined has 
+//     a single use.
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "peephole-opt"
-- 
cgit v1.2.3-18-g5258


From a1032b7e4c405474f8a26c731873d413b1f1d25b Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Mon, 17 Dec 2012 03:56:00 +0000
Subject: Add debug prints for when optimizeLoadInstr folds a load.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170298 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/PeepholeOptimizer.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib/CodeGen/PeepholeOptimizer.cpp')

diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp
index 0900ba3134..a7439b5129 100644
--- a/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/lib/CodeGen/PeepholeOptimizer.cpp
@@ -66,6 +66,7 @@
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 using namespace llvm;
@@ -478,6 +479,9 @@ bool PeepholeOptimizer::foldImmediate(MachineInstr *MI, MachineBasicBlock *MBB,
 }
 
 bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) {
+  DEBUG(dbgs() << "********** PEEPHOLE OPTIMIZER **********\n");
+  DEBUG(dbgs() << "********** Function: " << MF.getName() << '\n');
+
   if (DisablePeephole)
     return false;
 
@@ -552,6 +556,8 @@ bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) {
                                                       FoldAsLoadDefReg, DefMI);
         if (FoldMI) {
           // Update LocalMIs since we replaced MI with FoldMI and deleted DefMI.
+          DEBUG(dbgs() << "Replacing: " << *MI);
+          DEBUG(dbgs() << "     With: " << *FoldMI);
           LocalMIs.erase(MI);
           LocalMIs.erase(DefMI);
           LocalMIs.insert(FoldMI);
-- 
cgit v1.2.3-18-g5258