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no functional change, avoid conditional jump

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hexcoder- 2019-10-23 11:33:20 +02:00
parent 1398d8d5a6
commit 7d9eed0ed5
1 changed files with 8 additions and 5 deletions
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13
gcc_plugin/afl-gcc-rt.o.c
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@ -58,11 +58,14 @@ __thread u32 __afl_prev_loc;
void __afl_trace(u32 x) { void __afl_trace(u32 x) {
u32 l = __afl_prev_loc; u32 l = __afl_prev_loc;
__afl_area_ptr[l ^ x]++;
/* // neverZero is disable as gcc creates non-performant code. shame on you gcc #if 0 /* enable for neverZero feature. By default disabled since too inefficient :-( */
if (__afl_area_ptr[l ^ x] == 0) /* @Marc: avoid conditional jumps here */
__afl_area_ptr[l ^ x]++; __afl_area_ptr[l ^ x] += 1 + (__afl_area_ptr[l ^ x] == (u8)~0);
*/ #else
++__afl_area_ptr[l ^ x];
#endif
__afl_prev_loc = (x >> 1); __afl_prev_loc = (x >> 1);
return; return;