commit f858466018346e3b59acb9e3ac7dfd5ba4c0d0a9
author Evan Cheng <evan.cheng@apple.com> Mon Mar 23 18:24:37 2009 +0000
committer Evan Cheng <evan.cheng@apple.com> Mon Mar 23 18:24:37 2009 +0000
tree e4e577d0a629943609d240700b5968101a522108
parent 656711a36b2be1b2c2663f016badd59e3c3f26b3

Fix PR3391 and PR3864. Reg allocator infinite looping.

llvm-svn: 67544

llvm/lib/CodeGen/RegAllocLinearScan.cpp

diff --git a/llvm/lib/CodeGen/RegAllocLinearScan.cpp b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
index e8296a7..912135a 100644
--- a/llvm/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
@@ -869,8 +869,12 @@
     if (cur->weight == HUGE_VALF ||
         li_->getApproximateInstructionCount(*cur) == 0) {
       // Spill a physical register around defs and uses.
-      li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_);
-      assignRegOrStackSlotAtInterval(cur);
+      if (li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_))
+        assignRegOrStackSlotAtInterval(cur);
+      else {
+        cerr << "Ran out of registers during register allocation!\n";
+        exit(1);
+      }
       return;
     }
   }