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Use 'dst' as the CBRANCH condition register

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See issue #43
This commit is contained in:
tevador
2019-05-21 08:37:36 +02:00
parent 1276d67d2f
commit 8a5ead5ce3
10 changed files with 139 additions and 174 deletions
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20
src/common.hpp
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@@ -112,11 +112,6 @@ namespace randomx {
double hi;
};
struct RegisterUsage {
int32_t lastUsed;
int32_t count;
};
constexpr uint32_t ScratchpadL1 = RANDOMX_SCRATCHPAD_L1 / sizeof(int_reg_t);
constexpr uint32_t ScratchpadL2 = RANDOMX_SCRATCHPAD_L2 / sizeof(int_reg_t);
constexpr uint32_t ScratchpadL3 = RANDOMX_SCRATCHPAD_L3 / sizeof(int_reg_t);
@@ -131,21 +126,6 @@ namespace randomx {
constexpr int RegisterNeedsDisplacement = 5; //x86 r13 register
constexpr int RegisterNeedsSib = 4; //x86 r12 register
inline int getConditionRegister(RegisterUsage(&registerUsage)[RegistersCount]) {
int min = INT_MAX;
int minCount = 0;
int minIndex;
//prefer registers that have been used as a condition register fewer times
for (unsigned i = 0; i < RegistersCount; ++i) {
if (registerUsage[i].lastUsed < min || (registerUsage[i].lastUsed == min && registerUsage[i].count < minCount)) {
min = registerUsage[i].lastUsed;
minCount = registerUsage[i].count;
minIndex = i;
}
}
return minIndex;
}
inline bool isPowerOf2(uint64_t x) {
return (x & (x - 1)) == 0;
}