diff options
| -rw-r--r-- | llvm/lib/CodeGen/CalcSpillWeights.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/CalcSpillWeights.cpp b/llvm/lib/CodeGen/CalcSpillWeights.cpp index e4d5fa80ca3..2654f42d2c6 100644 --- a/llvm/lib/CodeGen/CalcSpillWeights.cpp +++ b/llvm/lib/CodeGen/CalcSpillWeights.cpp @@ -149,7 +149,11 @@ VirtRegAuxInfo::calculateSpillWeightAndHint(LiveInterval &li) { unsigned hint = copyHint(mi, li.reg, tri, mri); if (!hint) continue; - float hweight = Hint[hint] += weight; + // Force hweight onto the stack so that x86 doesn't add hidden precision, + // making the comparison incorrectly pass (i.e., 1 > 1 == true??). + // + // FIXME: we probably shouldn't use floats at all. + volatile float hweight = Hint[hint] += weight; if (TargetRegisterInfo::isPhysicalRegister(hint)) { if (hweight > bestPhys && mri.isAllocatable(hint)) bestPhys = hweight, hintPhys = hint; |
