Revert r124518. It broke Linux self-host.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124522 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TailDuplication.cpp b/lib/CodeGen/TailDuplication.cpp
index 15aed34..ce4b1be 100644
--- a/lib/CodeGen/TailDuplication.cpp
+++ b/lib/CodeGen/TailDuplication.cpp
@@ -465,12 +465,9 @@
MaxDuplicateCount = TailDuplicateSize;
if (PreRegAlloc) {
- if (TailBB->empty())
- return false;
- const TargetInstrDesc &TID = TailBB->back().getDesc();
- // Pre-regalloc tail duplication hurts compile time and doesn't help
- // much except for indirect branches and returns.
- if (!TID.isIndirectBranch() && !TID.isReturn())
+ // Pre-regalloc tail duplication hurts compile time and doesn't help
+ // much except for indirect branches.
+ if (TailBB->empty() || !TailBB->back().getDesc().isIndirectBranch())
return false;
// If the target has hardware branch prediction that can handle indirect
// branches, duplicating them can often make them predictable when there
@@ -505,7 +502,7 @@
}
// Heuristically, don't tail-duplicate calls if it would expand code size,
// as it's less likely to be worth the extra cost.
- if (InstrCount > 1 && (PreRegAlloc && HasCall))
+ if (InstrCount > 1 && HasCall)
return false;
DEBUG(dbgs() << "\n*** Tail-duplicating BB#" << TailBB->getNumber() << '\n');