From 3f43a7021fae71c056f5e1afc60016cfd8193f68 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Fri, 6 Mar 2009 03:51:30 +0000
Subject: [PATCH] Do not count DbgInfoIntrinsic while estimating loop header
 size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66245 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LoopRotation.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/lib/Transforms/Scalar/LoopRotation.cpp b/lib/Transforms/Scalar/LoopRotation.cpp
index 65b74b4e7ff..a0882301332 100644
--- a/lib/Transforms/Scalar/LoopRotation.cpp
+++ b/lib/Transforms/Scalar/LoopRotation.cpp
@@ -14,7 +14,7 @@
 #define DEBUG_TYPE "loop-rotate"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Function.h"
-#include "llvm/Instructions.h"
+#include "llvm/IntrinsicInst.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/LoopPass.h"
 #include "llvm/Analysis/Dominators.h"
@@ -161,7 +161,19 @@ bool LoopRotate::rotateLoop(Loop *Lp, LPPassManager &LPM) {
 
   // Check size of original header and reject
   // loop if it is very big.
-  if (OrigHeader->size() > MAX_HEADER_SIZE)
+  unsigned Size = 0;
+  
+  // FIXME: Use common api to estimate size.
+  for (BasicBlock::const_iterator OI = OrigHeader->begin(), 
+         OE = OrigHeader->end(); OI != OE; ++OI) {
+      if (isa<PHINode>(OI)) 
+        continue;           // PHI nodes don't count.
+      if (isa<DbgInfoIntrinsic>(OI))
+        continue;  // Debug intrinsics don't count as size.
+      Size++;
+  }
+
+  if (Size > MAX_HEADER_SIZE)
     return false;
 
   // Now, this loop is suitable for rotation.