Accept null PhysReg arguments to checkRegMaskInterference.
Calling checkRegMaskInterference(VirtReg) checks if VirtReg crosses any
regmask operands, regardless of the registers they clobber.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158563 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveRegMatrix.cpp b/lib/CodeGen/LiveRegMatrix.cpp
index 61e1432..cdb1776 100644
--- a/lib/CodeGen/LiveRegMatrix.cpp
+++ b/lib/CodeGen/LiveRegMatrix.cpp
@@ -110,7 +110,7 @@
// The BitVector is indexed by PhysReg, not register unit.
// Regmask interference is more fine grained than regunits.
// For example, a Win64 call can clobber %ymm8 yet preserve %xmm8.
- return !RegMaskUsable.empty() && !RegMaskUsable.test(PhysReg);
+ return !RegMaskUsable.empty() && (!PhysReg || !RegMaskUsable.test(PhysReg));
}
bool LiveRegMatrix::checkRegUnitInterference(LiveInterval &VirtReg,