[esan|cfrag] Disable load/store instrumentation for cfrag
Summary:
Adds ClInstrumentFastpath option to control fastpath instrumentation.
Avoids the load/store instrumentation for the cache fragmentation tool.
Renames cache_frag_basic.ll to working_set_slow.ll for slowpath
instrumentation test.
Adds the __esan_init check in struct_field_count_basic.ll.
Reviewers: aizatsky
Subscribers: llvm-commits, bruening, eugenis, kcc, zhaoqin, vitalybuka
Differential Revision: http://reviews.llvm.org/D21079
llvm-svn: 272355
diff --git a/llvm/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
index 48a9396a..63391b3 100644
--- a/llvm/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
@@ -56,6 +56,9 @@
static cl::opt<bool> ClInstrumentMemIntrinsics(
"esan-instrument-memintrinsics", cl::init(true),
cl::desc("Instrument memintrinsics (memset/memcpy/memmove)"), cl::Hidden);
+static cl::opt<bool> ClInstrumentFastpath(
+ "esan-instrument-fastpath", cl::init(true),
+ cl::desc("Instrument fastpath"), cl::Hidden);
// Experiments show that the performance difference can be 2x or more,
// and accuracy loss is typically negligible, so we turn this on by default.
@@ -591,7 +594,8 @@
{IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
ConstantInt::get(IntptrTy, TypeSizeBytes)});
} else {
- if (instrumentFastpath(I, DL, IsStore, Addr, Alignment)) {
+ if (ClInstrumentFastpath &&
+ instrumentFastpath(I, DL, IsStore, Addr, Alignment)) {
NumFastpaths++;
return true;
}
@@ -708,8 +712,8 @@
const DataLayout &DL,
Value *Addr,
unsigned Alignment) {
- // TODO(bruening): implement a fastpath for aligned accesses
- return false;
+ // Do nothing.
+ return true; // Return true to avoid slowpath instrumentation.
}
bool EfficiencySanitizer::instrumentFastpathWorkingSet(