From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 15 Nov 2011 08:20:43 +0000 (+0000)
Subject: Check all overlaps when looking for used registers.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d1bfc301986c5e3203ec57cba4122342f7dca108;p=oota-llvm.git

Check all overlaps when looking for used registers.

A function using any RC alias is enough to enable the ExeDepsFix pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144636 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/ExecutionDepsFix.cpp b/lib/CodeGen/ExecutionDepsFix.cpp
index 050edce2ec8..16a8f921b3d 100644
--- a/lib/CodeGen/ExecutionDepsFix.cpp
+++ b/lib/CodeGen/ExecutionDepsFix.cpp
@@ -650,10 +650,11 @@ bool ExeDepsFix::runOnMachineFunction(MachineFunction &mf) {
   bool anyregs = false;
   for (TargetRegisterClass::const_iterator I = RC->begin(), E = RC->end();
        I != E; ++I)
-    if (MF->getRegInfo().isPhysRegUsed(*I)) {
-      anyregs = true;
-      break;
-    }
+    for (const unsigned *AI = TRI->getOverlaps(*I); *AI; ++AI)
+      if (MF->getRegInfo().isPhysRegUsed(*AI)) {
+        anyregs = true;
+        break;
+      }
   if (!anyregs) return false;
 
   // Initialize the AliasMap on the first use.