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Preserve floating point state when calling randomx_calculate_hash

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This commit is contained in:
tevador 2020-05-06 12:42:30 +02:00
parent ac574e3743
commit 6a764e90d0
3 changed files with 18 additions and 0 deletions
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4
src/randomx.cpp
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@ -36,6 +36,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "cpu.hpp"
#include <cassert>
#include <limits>
#include <cfenv>
extern "C" {
@ -349,6 +350,8 @@ extern "C" {
assert(machine != nullptr);
assert(inputSize == 0 || input != nullptr);
assert(output != nullptr);
fenv_t fpstate;
fegetenv(&fpstate);
alignas(16) uint64_t tempHash[8];
int blakeResult = blake2b(tempHash, sizeof(tempHash), input, inputSize, nullptr, 0);
assert(blakeResult == 0);
@ -361,6 +364,7 @@ extern "C" {
}
machine->run(&tempHash);
machine->getFinalResult(output, RANDOMX_HASH_SIZE);
fesetenv(&fpstate);
}
void randomx_calculate_hash_first(randomx_vm* machine, const void* input, size_t inputSize) {

2
src/randomx.h
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@ -246,6 +246,8 @@ RANDOMX_EXPORT void randomx_calculate_hash(randomx_vm *machine, const void *inpu
* and begin the calculation of the next hash.
* randomx_calculate_hash_last will output the hash value of the previous input.
*
* WARNING: These functions may alter the floating point rounding mode of the calling thread.
*
* @param machine is a pointer to a randomx_vm structure. Must not be NULL.
* @param input is a pointer to memory to be hashed. Must not be NULL.
* @param inputSize is the number of bytes to be hashed.

12
src/tests/tests.cpp
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@ -4,6 +4,7 @@
#include <cassert>
#include <iomanip>
#include <cfenv>
#include "utility.hpp"
#include "../bytecode_machine.hpp"
#include "../dataset.hpp"
@ -1051,6 +1052,10 @@ int main() {
assert(cacheMemory[33554431] == 0x1f47f056d05cd99b);
});
if (cache != nullptr)
randomx_release_cache(cache);
cache = randomx_alloc_cache(RANDOMX_FLAG_DEFAULT);
runTest("Hash batch test", RANDOMX_HAVE_COMPILER && stringsEqual(RANDOMX_ARGON_SALT, "RandomX\x03"), []() {
char hash1[RANDOMX_HASH_SIZE];
char hash2[RANDOMX_HASH_SIZE];
@ -1070,6 +1075,13 @@ int main() {
assert(equalsHex(hash3, "c36d4ed4191e617309867ed66a443be4075014e2b061bcdaf9ce7b721d2b77a8"));
});
runTest("Preserve rounding mode", RANDOMX_FREQ_CFROUND > 0, []() {
fesetround(FE_TONEAREST);
char hash[RANDOMX_HASH_SIZE];
calcStringHash("test key 000", "Lorem ipsum dolor sit amet", &hash);
assert(fegetround() == FE_TONEAREST);
});
randomx_destroy_vm(vm);
vm = nullptr;