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Demacroise set_shift_flags, reduce casting.

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This commit is contained in:
Thomas Harte 2024-01-16 13:51:16 -05:00
parent ea4cc4c9b3
commit fe34083ab8
1 changed files with 58 additions and 46 deletions
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104
Processors/Z80/Implementation/Z80Implementation.hpp
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@ -86,7 +86,7 @@ template < class T,
set_did_compute_flags();
};
/// Sets flags as expected at the end of a rotate operation.
/// Sets flags as expected at the end of an 8080-style rotate operation (i.e. RRA, RRCA, RLA or RLCA).
/// Specifically:
/// * N and H are set to 0;
/// * C is set to whatever is supplied as new_carry; and
@ -98,6 +98,19 @@ template < class T,
set_did_compute_flags();
};
/// Sets flags as expected at the end of a shift or post-8080-style rotate operation.
/// Specifically:
/// * N, Z, 5 and 3 are set according to the value of source;
/// * P is set according to the parity of the source; and
/// * H and N are reset.
const auto set_shift_flags = [&](uint8_t source) {
sign_result_ = zero_result_ = bit53_result_ = source;
set_parity(source);
half_carry_result_ = 0;
subtract_flag_ = 0;
set_did_compute_flags();
};
/// Takes appropriate action for an untaken conditional branch; this might mean just skipping to the next instruction or it might mean taking
/// some other alternative follow-up action.
const auto decline_conditional = [&](const MicroOp *operation) {
@ -712,64 +725,63 @@ template < class T,
set_rotate_flags(new_carry);
} break;
#define set_shift_flags() \
sign_result_ = zero_result_ = bit53_result_ = *static_cast<uint8_t *>(operation->source); \
set_parity(sign_result_); \
half_carry_result_ = 0; \
subtract_flag_ = 0; \
set_did_compute_flags();
case MicroOp::RLC: {
uint8_t &source = *static_cast<uint8_t *>(operation->source);
carry_result_ = source >> 7;
source = uint8_t((source << 1) | carry_result_);
set_shift_flags(source);
} break;
case MicroOp::RLC:
carry_result_ = *static_cast<uint8_t *>(operation->source) >> 7;
*static_cast<uint8_t *>(operation->source) = uint8_t((*static_cast<uint8_t *>(operation->source) << 1) | carry_result_);
set_shift_flags();
break;
case MicroOp::RRC:
carry_result_ = *static_cast<uint8_t *>(operation->source);
*static_cast<uint8_t *>(operation->source) = uint8_t((*static_cast<uint8_t *>(operation->source) >> 1) | (carry_result_ << 7));
set_shift_flags();
break;
case MicroOp::RRC: {
uint8_t &source = *static_cast<uint8_t *>(operation->source);
carry_result_ = source;
source = uint8_t((source >> 1) | (carry_result_ << 7));
set_shift_flags(source);
} break;
case MicroOp::RL: {
const uint8_t next_carry = *static_cast<uint8_t *>(operation->source) >> 7;
*static_cast<uint8_t *>(operation->source) = uint8_t((*static_cast<uint8_t *>(operation->source) << 1) | (carry_result_ & Flag::Carry));
uint8_t &source = *static_cast<uint8_t *>(operation->source);
const uint8_t next_carry = source >> 7;
source = uint8_t((source << 1) | (carry_result_ & Flag::Carry));
carry_result_ = next_carry;
set_shift_flags();
set_shift_flags(source);
} break;
case MicroOp::RR: {
const uint8_t next_carry = *static_cast<uint8_t *>(operation->source);
*static_cast<uint8_t *>(operation->source) = uint8_t((*static_cast<uint8_t *>(operation->source) >> 1) | (carry_result_ << 7));
uint8_t &source = *static_cast<uint8_t *>(operation->source);
const uint8_t next_carry = source;
source = uint8_t((source >> 1) | (carry_result_ << 7));
carry_result_ = next_carry;
set_shift_flags();
set_shift_flags(source);
} break;
case MicroOp::SLA:
carry_result_ = *static_cast<uint8_t *>(operation->source) >> 7;
*static_cast<uint8_t *>(operation->source) = uint8_t(*static_cast<uint8_t *>(operation->source) << 1);
set_shift_flags();
break;
case MicroOp::SLA: {
uint8_t &source = *static_cast<uint8_t *>(operation->source);
carry_result_ = source >> 7;
source <<= 1;
set_shift_flags(source);
} break;
case MicroOp::SRA:
carry_result_ = *static_cast<uint8_t *>(operation->source);
*static_cast<uint8_t *>(operation->source) = uint8_t((*static_cast<uint8_t *>(operation->source) >> 1) | (*static_cast<uint8_t *>(operation->source) & 0x80));
set_shift_flags();
break;
case MicroOp::SRA: {
uint8_t &source = *static_cast<uint8_t *>(operation->source);
carry_result_ = source;
source = uint8_t((source >> 1) | (source & 0x80));
set_shift_flags(source);
} break;
case MicroOp::SLL:
carry_result_ = *static_cast<uint8_t *>(operation->source) >> 7;
*static_cast<uint8_t *>(operation->source) = uint8_t(*static_cast<uint8_t *>(operation->source) << 1) | 1;
set_shift_flags();
break;
case MicroOp::SLL: {
uint8_t &source = *static_cast<uint8_t *>(operation->source);
carry_result_ = source >> 7;
source = uint8_t(source << 1) | 1;
set_shift_flags(source);
} break;
case MicroOp::SRL:
carry_result_ = *static_cast<uint8_t *>(operation->source);
*static_cast<uint8_t *>(operation->source) = uint8_t((*static_cast<uint8_t *>(operation->source) >> 1));
set_shift_flags();
break;
#undef set_shift_flags
case MicroOp::SRL: {
uint8_t &source = *static_cast<uint8_t *>(operation->source);
carry_result_ = source;
source >>= 1;
set_shift_flags(source);
} break;
#define set_decimal_rotate_flags() \
subtract_flag_ = 0; \