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[libFuzzer] Avoid optimization of "abs(x) < 0" 

llvm-svn: 333295
This commit is contained in:
Vitaly Buka 2018-05-25 18:27:12 +00:00
parent 7ae70fc14a
commit 540d7e528d
2 changed files with 4 additions and 2 deletions
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3
compiler-rt/test/fuzzer/AbsNegAndConstant64Test.cpp
View File

@ -14,7 +14,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
uint64_t y;
memcpy(&x, Data, sizeof(x));
memcpy(&y, Data + sizeof(x), sizeof(y));
if (llabs(x) < 0 && y == 0xbaddcafedeadbeefULL) {
volatile int64_t abs_x = llabs(x);
if (abs_x < 0 && y == 0xbaddcafedeadbeefULL) {
printf("BINGO; Found the target, exiting; x = 0x%lx y 0x%lx\n", x, y);
fflush(stdout);
exit(1);

3
compiler-rt/test/fuzzer/AbsNegAndConstantTest.cpp
View File

@ -14,7 +14,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
unsigned y;
memcpy(&x, Data, sizeof(x));
memcpy(&y, Data + sizeof(x), sizeof(y));
if (abs(x) < 0 && y == 0xbaddcafe) {
volatile int abs_x = abs(x);
if (abs_x < 0 && y == 0xbaddcafe) {
printf("BINGO; Found the target, exiting; x = 0x%x y 0x%x\n", x, y);
fflush(stdout);
exit(1);