From a5545bc2b9b1295f8443f6350487ec9b775b2d73 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Fri, 28 Jun 2013 18:57:01 +0000
Subject: [PATCH] Fix an off-by-one error.  Also make the code a little more
 explicit in what it is trying to do.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185191 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86FloatingPoint.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp
index 8522c8cee6b..a4ea1a9eab0 100644
--- a/lib/Target/X86/X86FloatingPoint.cpp
+++ b/lib/Target/X86/X86FloatingPoint.cpp
@@ -115,9 +115,10 @@ namespace {
       unsigned Mask = 0;
       for (MachineBasicBlock::livein_iterator I = MBB->livein_begin(),
            E = MBB->livein_end(); I != E; ++I) {
-        unsigned Reg = *I - X86::FP0;
-        if (Reg < 8)
-          Mask |= 1 << Reg;
+        unsigned Reg = *I;
+        if (Reg < X86::FP0 || Reg > X86::FP6)
+          continue;
+        Mask |= 1 << (Reg - X86::FP0);
       }
       return Mask;
     }