Disable the new aggressive remat logic introduced in 54000; it causes some
regressions, such as PR2595. Also, there is a significant code-quality
issue in SPEC 464.h264ref and a few others.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54014 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index adc1e20..0955785 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -47,6 +47,8 @@
static cl::opt<int> SplitLimit("split-limit",
cl::init(-1), cl::Hidden);
+static cl::opt<bool> EnableAggressiveRemat("aggressive-remat", cl::Hidden);
+
STATISTIC(numIntervals, "Number of original intervals");
STATISTIC(numIntervalsAfter, "Number of intervals after coalescing");
STATISTIC(numFolds , "Number of loads/stores folded into instructions");
@@ -797,6 +799,8 @@
// rules.
if (!MI->getDesc().isRematerializable() ||
!tii_->isTriviallyReMaterializable(MI)) {
+ if (!EnableAggressiveRemat)
+ return false;
// If the instruction access memory but the memoperands have been lost,
// we can't analyze it.