[llvm-commits] [llvm] r147486 - /llvm/trunk/lib/CodeGen/VirtRegMap.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Tue Jan  3 16:34:31 2012
New Revision: 147486

URL: http://llvm.org/viewvc/llvm-project?rev=147486&view=rev
Log:
Assert when reserved registers have been assigned.

This can only happen if the set of reserved registers changes during
register allocation.

<rdar://problem/10625436>

Modified:
    llvm/trunk/lib/CodeGen/VirtRegMap.cpp

Modified: llvm/trunk/lib/CodeGen/VirtRegMap.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/VirtRegMap.cpp?rev=147486&r1=147485&r2=147486&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/VirtRegMap.cpp (original)
+++ llvm/trunk/lib/CodeGen/VirtRegMap.cpp Tue Jan  3 16:34:31 2012
@@ -112,6 +112,9 @@
   SmallVector<unsigned, 8> SuperDeads;
   SmallVector<unsigned, 8> SuperDefs;
   SmallVector<unsigned, 8> SuperKills;
+#ifndef NDEBUG
+  BitVector Reserved = TRI->getReservedRegs(*MF);
+#endif
 
   for (MachineFunction::iterator MBBI = MF->begin(), MBBE = MF->end();
        MBBI != MBBE; ++MBBI) {
@@ -129,6 +132,7 @@
         unsigned VirtReg = MO.getReg();
         unsigned PhysReg = getPhys(VirtReg);
         assert(PhysReg != NO_PHYS_REG && "Instruction uses unmapped VirtReg");
+        assert(!Reserved.test(PhysReg) && "Reserved register assignment");
 
         // Preserve semantics of sub-register operands.
         if (MO.getSubReg()) {