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Made sure code generator loop always terminates

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It never did more than 176 iterations for first 10,000,000 heights, so I set fail-safe at 256 iterations.
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SChernykh 2019-02-10 10:04:59 +01:00 committed by wowario
parent 46f3d3e975
commit 33743eb7ac
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GPG Key ID: 24DCBE762DE9C111
1 changed files with 7 additions and 0 deletions
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src/crypto/variant4_random_math.h
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@ -233,10 +233,17 @@ static inline int v4_random_math_init(struct V4_Instruction* code, const uint64_
int num_retries = 0; int num_retries = 0;
code_size = 0; code_size = 0;
int total_iterations = 0;
// Generate random code to achieve minimal required latency for our abstract CPU // Generate random code to achieve minimal required latency for our abstract CPU
// Try to get this latency for all 4 registers // Try to get this latency for all 4 registers
while (((latency[0] < TOTAL_LATENCY) || (latency[1] < TOTAL_LATENCY) || (latency[2] < TOTAL_LATENCY) || (latency[3] < TOTAL_LATENCY)) && (num_retries < 64)) while (((latency[0] < TOTAL_LATENCY) || (latency[1] < TOTAL_LATENCY) || (latency[2] < TOTAL_LATENCY) || (latency[3] < TOTAL_LATENCY)) && (num_retries < 64))
{ {
// Fail-safe to guarantee loop termination
++total_iterations;
if (total_iterations > 256)
break;
check_data(&data_index, 1, data, sizeof(data)); check_data(&data_index, 1, data, sizeof(data));
const uint8_t c = ((uint8_t*)data)[data_index++]; const uint8_t c = ((uint8_t*)data)[data_index++];