My earlier "fix" for PBQP (see r165201) was incorrect. The real issue was that
checkRegMaskInterference only initializes the bitmask on the first interference.
This fixes PR14027 and (re)fixes PR13945.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165608 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocPBQP.cpp b/lib/CodeGen/RegAllocPBQP.cpp
index f247368..984aab2 100644
--- a/lib/CodeGen/RegAllocPBQP.cpp
+++ b/lib/CodeGen/RegAllocPBQP.cpp
@@ -218,7 +218,7 @@
LiveInterval *vregLI = &LIS->getInterval(vreg);
// Record any overlaps with regmask operands.
- BitVector regMaskOverlaps(tri->getNumRegs());
+ BitVector regMaskOverlaps;
LIS->checkRegMaskInterference(*vregLI, regMaskOverlaps);
// Compute an initial allowed set for the current vreg.
@@ -231,7 +231,7 @@
continue;
// vregLI crosses a regmask operand that clobbers preg.
- if (!regMaskOverlaps.empty() && regMaskOverlaps.test(preg))
+ if (!regMaskOverlaps.empty() && !regMaskOverlaps.test(preg))
continue;
// vregLI overlaps fixed regunit interference.