Fix an off-by-one error. Also make the code a little more explicit in what it

is trying to do.

llvm-svn: 185191

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/Target/X86/X86FloatingPoint.cpp b/llvm/lib/Target/X86/X86FloatingPoint.cpp
index 8522c8cee6b..a4ea1a9eab0 100644
--- a/llvm/lib/Target/X86/X86FloatingPoint.cpp
+++ b/llvm/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;
     }