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Avoid loop.

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This commit is contained in:
Thomas Harte 2023-10-13 21:32:35 -04:00
parent 6ec291d96f
commit 6f7991f54a
1 changed files with 16 additions and 4 deletions
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20
InstructionSets/x86/Implementation/PerformImplementation.hpp
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@ -956,11 +956,23 @@ inline void rcl(IntT &destination, uint8_t count, Status &status) {
*/
auto temp_count = count % (Numeric::bit_size<IntT>() + 1);
auto carry = status.carry_bit<IntT>();
while(temp_count--) {
const IntT temp_carry = (destination >> (Numeric::bit_size<IntT>() - 1)) & 1;
destination = (destination << 1) | carry;
carry = temp_carry;
switch(temp_count) {
case 0: break;
case Numeric::bit_size<IntT>(): {
const IntT temp_carry = destination & 1;
destination = (destination >> 1) | (carry << (Numeric::bit_size<IntT>() - 1));
carry = temp_carry;
} break;
default: {
const IntT temp_carry = destination & (Numeric::top_bit<IntT>() >> (temp_count - 1));
destination =
(destination << temp_count) |
(destination >> (Numeric::bit_size<IntT>() + 1 - temp_count)) |
(carry << (temp_count - 1));
carry = temp_carry ? 1 : 0;
} break;
}
status.set_from<Flag::Carry>(carry);
status.set_from<Flag::Overflow>(
((destination >> (Numeric::bit_size<IntT>() - 1)) & 1) ^ carry