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Fixed a chance of CBRANCH looping

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Fixed CBRANCH jump probability being lower than expected
This commit is contained in:
tevador
2019-05-03 14:02:40 +02:00
parent 5241cb902e
commit 9e5eac8645
8 changed files with 73 additions and 46 deletions
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src/vm_interpreted.cpp
+4 -2
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@@ -615,9 +615,11 @@ namespace randomx {
ibc.isrc = &r[reg];
ibc.target = registerUsage[reg].lastUsed;
registerUsage[reg].count++;
int shift = instr.getModCond();
const uint64_t conditionMask = ConditionMask << instr.getModCond();
int shift = instr.getModCond() + ConditionOffset;
const uint64_t conditionMask = ConditionMask << shift;
ibc.imm = signExtend2sCompl(instr.getImm32()) | (1ULL << shift);
if (ConditionOffset > 0 || shift > 0) //clear the bit below the condition mask - this limits the number of successive jumps to 2
ibc.imm &= ~(1ULL << (shift - 1));
ibc.memMask = ConditionMask << shift;
//mark all registers as used
for (unsigned j = 0; j < RegistersCount; ++j) {