From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Wed, 26 May 2010 22:40:28 +0000 (+0000)
Subject: Avoid counting InlineAsm as a call - it prevents loop unrolling.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=8b3ca84a8deeb946114f72d2a6aea243b630c4a8

Avoid counting InlineAsm as a call - it prevents loop unrolling.
PR7026
Patch by Pekka Jääskeläinen!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104780 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/InlineCost.cpp b/lib/Analysis/InlineCost.cpp
index 10c2d79bef3..98dbb69fe6a 100644
--- a/lib/Analysis/InlineCost.cpp
+++ b/lib/Analysis/InlineCost.cpp
@@ -175,7 +175,11 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
       if (!isa<IntrinsicInst>(II) && !callIsSmall(CS.getCalledFunction())) {
         // Each argument to a call takes on average one instruction to set up.
         NumInsts += CS.arg_size();
-        ++NumCalls;
+
+        // We don't want inline asm to count as a call - that would prevent loop
+        // unrolling. The argument setup cost is still real, though.
+        if (!isa<InlineAsm>(CS.getCalledValue()))
+          ++NumCalls;
       }
     }