From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 20 Dec 2007 02:23:25 +0000 (+0000)
Subject: The physical register + virtual register joining requirement was much too strict.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=689494208b555240d6021a7bbc25b9bbb9c2d49f;p=oota-llvm.git

The physical register + virtual register joining requirement was much too strict.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45253 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index c608b8d1c4a..c03933944f8 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -396,7 +396,7 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec TheCopy, bool &Again) {
     unsigned JoinVReg = SrcIsPhys ? repDstReg : repSrcReg;
     unsigned JoinPReg = SrcIsPhys ? repSrcReg : repDstReg;
     const TargetRegisterClass *RC = mf_->getSSARegMap()->getRegClass(JoinVReg);
-    unsigned Threshold = allocatableRCRegs_[RC].count();
+    unsigned Threshold = allocatableRCRegs_[RC].count() * 2;
     if (TheCopy.isBackEdge)
       Threshold *= 2; // Favors back edge copies.