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-rw-r--r--llvm_mode/afl-llvm-pass.so.cc8
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm_mode/afl-llvm-pass.so.cc b/llvm_mode/afl-llvm-pass.so.cc
index a2753a6b..0b3db4ed 100644
--- a/llvm_mode/afl-llvm-pass.so.cc
+++ b/llvm_mode/afl-llvm-pass.so.cc
@@ -156,9 +156,14 @@ bool AFLCoverage::runOnModule(Module &M) {
 
   /* Instrument all the things! */
 
+  const char *IntrinsicPrefix = "llvm.";
   int inst_blocks = 0;
 
-  for (auto &F : M)
+  for (auto &F : M) {
+
+    auto Fname = F.getName();
+    if (Fname.startswith(IntrinsicPrefix)) continue;
+
     for (auto &BB : F) {
 
       BasicBlock::iterator IP = BB.getFirstInsertionPt();
@@ -372,6 +377,7 @@ bool AFLCoverage::runOnModule(Module &M) {
       inst_blocks++;
 
     }
+  }
 
   /* Say something nice. */