this is the best solution IMHO
MODIFY
llvm_mode/afl-llvm-pass.so.cc
llvm_mode/afl-llvm-pass.so.cc
@@ -237,7 +237,7 @@ bool AFLCoverage::runOnModule(Module &M) {
Counter->setMetadata(M.getMDKindID("nosanitize"), MDNode::get(C, None));
Value *Incr;
- if (neverZero_counters_str == NULL || neverZero_counters_str[0] != '4')
+ // if (neverZero_counters_str == NULL || neverZero_counters_str[0] != '4')
Incr = IRB.CreateAdd(Counter, ConstantInt::get(Int8Ty, 1));
if (neverZero_counters_str != NULL) {
@@ -255,6 +255,7 @@ bool AFLCoverage::runOnModule(Module &M) {
//mov ecx,edx
//add cl,0x1
//adc dl,0x1
+/*
if (neverZero_counters_str[0] == '1') {
CallInst *AddOv = IRB.CreateBinaryIntrinsic(Intrinsic::uadd_with_overflow, Counter, ConstantInt::get(Int8Ty, 1));
AddOv->setMetadata(M.getMDKindID("nosanitize"), MDNode::get(C, None));
@@ -276,7 +277,6 @@ bool AFLCoverage::runOnModule(Module &M) {
} else if (neverZero_counters_str[0] == '3') {
auto cf = IRB.CreateICmpEQ(Incr, ConstantInt::get(Int8Ty, 0));
Incr = IRB.CreateAdd(Incr, cf);
-
// Solution #4 - creates
// cmp dl, $0xff
// sete cl
@@ -288,10 +288,11 @@ bool AFLCoverage::runOnModule(Module &M) {
Incr = IRB.CreateAdd(Counter, HowMuch);
} else if (neverZero_counters_str[0] == '5') {
+*/
auto cf = IRB.CreateICmpEQ(Incr, ConstantInt::get(Int8Ty, 0));
auto carry = IRB.CreateZExt(cf, Int8Ty);
Incr = IRB.CreateAdd(Incr, carry);
-
+/*
} else if (neverZero_counters_str[0] == '6') {
auto cf = IRB.CreateICmpULT(Incr, ConstantInt::get(Int8Ty, 1));
auto carry = IRB.CreateZExt(cf, Int8Ty);
@@ -302,6 +303,7 @@ bool AFLCoverage::runOnModule(Module &M) {
fprintf(stderr, "Error: unknown value for AFL_NZERO_COUNTS: %s (valid is 1-4)\n", neverZero_counters_str);
exit(-1);
}
+*/
}
IRB.CreateStore(Incr, MapPtrIdx)->setMetadata(M.getMDKindID("nosanitize"), MDNode::get(C, None));

this is the best solution IMHO