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Instruction.cpp
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Instruction.cpp
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// Copyright (c) 2011-12, Richard Osborne, All rights reserved
// This software is freely distributable under a derivative of the
// University of Illinois/NCSA Open Source License posted in
// LICENSE.txt and at <http://github.xcore.com/>
#include "Instruction.h"
#include "Core.h"
#include <cassert>
static inline uint32_t bits(uint32_t value, unsigned shift, unsigned size)
{
return (value >> shift) & ((1 << size) - 1);
}
static inline uint32_t bitRange(uint32_t value, unsigned high, unsigned low)
{
return bits(value, low, 1 + high - low);
}
static inline uint32_t bit(uint32_t value, unsigned shift)
{
return bits(value, shift, 1);
}
// Also tests for 2RUS
static inline bool test3R(uint32_t low)
{
return bitRange(low, 10, 6) < 27;
}
// Also tests for RUS
static inline bool test2R(uint32_t low)
{
uint32_t combined = (bitRange(low, 10, 6) - 27) + bit(low, 5) * 5;
return combined < 9;
}
static inline bool test1R(uint32_t low)
{
return (bitRange(low, 10, 5) == 0x3f) && (bitRange(low, 3, 0) < 12);
}
static inline bool testRU6(uint32_t low)
{
return bitRange(low, 9, 6) < 12;
}
static inline bool testRU6_2(UNUSED(uint32_t low))
{
return true;
}
static inline bool testLRU6(uint32_t high, UNUSED(uint32_t low))
{
return testRU6(high);
}
static inline bool testLRU6_2(uint32_t high, UNUSED(uint32_t low))
{
return testRU6_2(high);
}
static inline bool testL2R(uint32_t high, uint32_t low)
{
uint32_t combined = (bitRange(low, 10, 6) - 27) + bit(low, 5) * 5;
return combined < 9 && (bitRange(high, 10, 4) == 0x7e);
}
// Also tests for L2RUS
static inline bool testL3R(uint32_t high, uint32_t low)
{
return bitRange(low, 10, 6) < 27 && bitRange(high, 10, 4) == 0x7e;
}
static inline bool testL4R(uint32_t high, uint32_t low)
{
return bitRange(low, 10, 6) < 27 && bitRange(high, 3, 0) < 12
&& bitRange(high, 10, 5) == 0x3f;
}
static inline bool testL5R(uint32_t high, uint32_t low)
{
if (bitRange(low, 10, 6) > 26) {
return false;
}
uint32_t combined = (bitRange(high, 10, 6) - 27) + bit(high, 5) * 5;
return combined < 9;
}
static inline bool testL6R(uint32_t high, uint32_t low)
{
return bitRange(low, 10, 6) < 27 &&
bitRange(high, 10, 6) < 27;
}
static void decode3ROperands(Operands &operands, uint32_t low)
{
uint32_t combined = bitRange(low, 10, 6);
uint32_t op0_high = combined % 3;
uint32_t op1_high = (combined / 3) % 3;
uint32_t op2_high = combined / 9;
operands.ops[0] = bitRange(low, 5, 4) | (op0_high << 2);
operands.ops[1] = bitRange(low, 3, 2) | (op1_high << 2);
operands.ops[2] = bitRange(low, 1, 0) | (op2_high << 2);
}
static inline void decodeL3ROperands(Operands &operands, UNUSED(uint32_t high), uint32_t low)
{
decode3ROperands(operands, low);
}
static inline void decode2RUSOperands(Operands &operands, uint32_t low)
{
decode3ROperands(operands, low);
}
static inline void decodeL2RUSOperands(Operands &operands, uint32_t high, uint32_t low)
{
decodeL3ROperands(operands, high, low);
}
static inline void decodeRU6Operands(Operands &operands, uint32_t low)
{
operands.ops[0] = bitRange(low, 9, 6);
operands.ops[1] = bitRange(low, 5, 0);
}
static inline void decodeLRU6Operands(Operands &operands, uint32_t high, uint32_t low)
{
operands.ops[0] = bitRange(high, 9, 6);
operands.ops[1] = bitRange(high, 5, 0) | (bitRange(low, 9, 0) << 6);
}
static inline void decodeU6Operands(Operands &operands, uint32_t low)
{
operands.ops[0] = bitRange(low, 5, 0);
}
static inline void decodeLU6Operands(Operands &operands, uint32_t high, uint32_t low)
{
operands.ops[0] = bitRange(high, 5, 0) | (bitRange(low, 9, 0) << 6);
}
static inline void decodeU10Operands(Operands &operands, uint32_t low)
{
operands.ops[0] = bitRange(low, 9, 0);
}
static inline void decodeLU10Operands(Operands &operands, uint32_t high, uint32_t low)
{
operands.ops[0] = bitRange(high, 9, 0) | (bitRange(low, 9, 0) << 10);
}
static void decode2ROperands(Operands &operands, uint32_t low)
{
uint32_t combined = (bitRange(low, 10, 6) - 27) + bit(low, 5) * 5;
uint32_t op0_high = combined%3;
uint32_t op1_high = combined/3;
operands.ops[0] = bitRange(low, 3, 2) | (op0_high << 2);
operands.ops[1] = bitRange(low, 1, 0) | (op1_high << 2);
}
static inline void decodeL2ROperands(Operands &operands, UNUSED(uint32_t high), uint32_t low)
{
decode2ROperands(operands, low);
}
static void decodeRUSOperands(Operands &operands, uint32_t low)
{
uint32_t combined = (bitRange(low, 10, 6) - 27) + bit(low, 5) * 5;
uint32_t op0_high = combined%0x3;
uint32_t op1_high = combined/3;
operands.ops[0] = bitRange(low, 3, 2) | (op0_high << 2);
operands.ops[1] = bitRange(low, 1, 0) | (op1_high << 2);
}
static inline void decode1ROperands(Operands &operands, uint32_t low)
{
operands.ops[0] = bitRange(low, 3, 0);
}
static void decodeL4ROperands(Operands &operands, uint32_t high, uint32_t low)
{
uint32_t combined = bitRange(low, 10, 6);
uint32_t op0_high = combined % 3;
uint32_t op1_high = (combined / 3) % 3;
uint32_t op2_high = combined / 9;
operands.lops[0] = bitRange(low, 5, 4) | (op0_high << 2);
operands.lops[1] = bitRange(low, 3, 2) | (op1_high << 2);
operands.lops[2] = bitRange(low, 1, 0) | (op2_high << 2);
operands.lops[3] = bitRange(high, 3, 0);
}
static void decodeL5ROperands(Operands &operands, uint32_t high, uint32_t low)
{
uint32_t combined_low = bitRange(low, 10, 6);
uint32_t op0_high = combined_low % 3;
uint32_t op1_high = (combined_low / 3) % 3;
uint32_t op2_high = combined_low / 9;
uint32_t combined_high = (bitRange(high, 10, 6) - 27) + bit(high, 5) * 5;
uint32_t op3_high = combined_high%3;
uint32_t op4_high = combined_high/3;
operands.lops[0] = bitRange(low, 5, 4) | (op0_high << 2);
operands.lops[1] = bitRange(low, 3, 2) | (op1_high << 2);
operands.lops[2] = bitRange(low, 1, 0) | (op2_high << 2);
operands.lops[3] = bitRange(high, 3, 2) | (op3_high << 2);
operands.lops[4] = bitRange(high, 1, 0) | (op4_high << 2);
}
static void decodeL6ROperands(Operands &operands, uint32_t high, uint32_t low)
{
uint32_t combined_low = bitRange(low, 10, 6);
uint32_t op0_high = combined_low % 3;
uint32_t op1_high = (combined_low / 3) % 3;
uint32_t op2_high = combined_low / 9;
uint32_t combined_high = bitRange(high, 10, 6);
uint32_t op3_high = combined_high % 3;
uint32_t op4_high = (combined_high / 3) % 3;
uint32_t op5_high = combined_high / 9;
operands.lops[0] = bitRange(low, 5, 4) | (op0_high << 2);
operands.lops[1] = bitRange(low, 3, 2) | (op1_high << 2);
operands.lops[2] = bitRange(low, 1, 0) | (op2_high << 2);
operands.lops[3] = bitRange(high, 5, 4) | (op3_high << 2);
operands.lops[4] = bitRange(high, 3, 2) | (op4_high << 2);
operands.lops[5] = bitRange(high, 1, 0) | (op5_high << 2);
}
#define DECODE_3R(inst, low) \
do { \
opcode = inst; \
decode3ROperands(operands, low); \
} while(0)
#define DECODE_2RUS(inst, low) \
do { \
opcode = inst; \
decode2RUSOperands(operands, low); \
} while(0)
#define DECODE_RU6(inst, low) \
do { \
opcode = inst; \
decodeRU6Operands(operands, low); \
} while(0)
#define DECODE_LRU6(inst, high, low) \
do { \
opcode = inst; \
decodeLRU6Operands(operands, high, low); \
} while(0)
#define DECODE_2R(inst, low) \
do { \
opcode = inst; \
decode2ROperands(operands, low); \
} while(0)
#define DECODE_RUS(inst, low) \
do { \
opcode = inst; \
decodeRUSOperands(operands, low); \
} while(0)
#define DECODE_1R(inst, low) \
do { \
opcode = inst; \
decode1ROperands(operands, low); \
} while(0)
#define DECODE_U6(inst, low) \
do { \
opcode = inst; \
decodeU6Operands(operands, low); \
} while(0)
#define DECODE_LU6(inst, high, low) \
do { \
opcode = inst; \
decodeLU6Operands(operands, high, low); \
} while(0)
#define DECODE_U10(inst, low) \
do { \
opcode = inst; \
decodeU10Operands(operands, low); \
} while(0)
#define DECODE_LU10(inst, high, low) \
do { \
opcode = inst; \
decodeLU10Operands(operands, high, low); \
} while(0)
#define DECODE_0R(inst) \
do { \
opcode = inst; \
} while(0)
#define DECODE_L2R(inst, high, low) \
do { \
opcode = inst; \
decodeL2ROperands(operands, high, low); \
} while(0)
#define DECODE_L3R(inst, high, low) \
do { \
opcode = inst; \
decodeL3ROperands(operands, high, low); \
} while(0)
#define DECODE_L2RUS(inst, high, low) \
do { \
opcode = inst; \
decodeL2RUSOperands(operands, high, low); \
} while(0)
#define DECODE_L4R(inst, high, low) \
do { \
opcode = inst; \
decodeL4ROperands(operands, high, low); \
} while(0)
#define DECODE_L5R(inst, high, low) \
do { \
opcode = inst; \
decodeL5ROperands(operands, high, low); \
} while(0)
#define DECODE_L6R(inst, high, low) \
do { \
opcode = inst; \
decodeL6ROperands(operands, high, low); \
} while(0)
#define OP(n) (operands.ops[(n)])
static unsigned bitpValue(unsigned Value)
{
assert(Value < 12 && "Invalid bitp immediate");
static unsigned bitpValues[12] = {
32,
1,
2,
3,
4,
5,
6,
7,
8,
16,
24,
32
};
return bitpValues[Value];
}
void instructionDecode(Core &core, uint32_t pc, InstructionOpcode &opcode,
Operands &operands)
{
assert(core.isValidPc(pc));
if (pc == core.syscallAddress) {
opcode = SYSCALL;
return;
}
if (pc == core.exceptionAddress) {
opcode = EXCEPTION;
return;
}
uint32_t address = core.fromPc(pc);
uint16_t low = core.loadShort(address);
uint16_t high = 0;
bool highValid;
if (core.isValidAddress(address + 2)) {
high = core.loadShort(address + 2);
highValid = true;
} else {
highValid = false;
}
return instructionDecode(low, high, highValid, opcode, operands);
}
#define PFIX 0x1e /* 0b11110 */
#define EOPR 0x1f /* 0b11111 */
void
instructionDecode(uint16_t low, uint16_t high, bool highValid,
InstructionOpcode &opcode, Operands &operands) {
/* bits 15:11 */
unsigned opc = bitRange(low, 15, 11);
switch (opc) {
case 0x00: /* 0b00000 */
if (test3R(low)) {
DECODE_2RUS(STW_2rus, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(TINITPC_2r, low);
break;
case 1:
DECODE_2R(GETST_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(EDU_1r, low);
break;
case 1:
DECODE_1R(EEU_1r, low);
break;
}
} else {
switch (low) {
case 0x07ec:
DECODE_0R(WAITEU_0r);
break;
case 0x07ed:
DECODE_0R(CLRE_0r);
break;
case 0x07ee:
DECODE_0R(SSYNC_0r);
break;
case 0x07ef:
DECODE_0R(FREET_0r);
break;
case 0x07fc:
DECODE_0R(DCALL_0r);
break;
case 0x07fd:
DECODE_0R(KRET_0r);
break;
case 0x07fe:
DECODE_0R(DRET_0r);
break;
case 0x07ff:
DECODE_0R(SETKEP_0r);
break;
}
}
break;
case 0x01: /* 0b00001 */
if (test3R(low)) {
DECODE_2RUS(LDW_2rus, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(TINITDP_2r, low);
break;
case 1:
DECODE_2R(OUTT_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(WAITET_1r, low);
break;
case 1:
DECODE_1R(WAITEF_1r, low);
break;
}
} else {
switch (low) {
case 0x0fec:
DECODE_0R(LDSPC_0r);
break;
case 0x0fed:
DECODE_0R(STSPC_0r);
break;
case 0x0fee:
DECODE_0R(LDSSR_0r);
break;
case 0x0fef:
DECODE_0R(STSSR_0r);
break;
case 0x0ffc:
DECODE_0R(STSED_0r);
break;
case 0x0ffd:
DECODE_0R(STET_0r);
break;
case 0x0ffe:
DECODE_0R(GETED_0r);
break;
case 0x0fff:
DECODE_0R(GETET_0r);
break;
}
}
break;
case 0x02: /* 0b00010 */
if (test3R(low)) {
DECODE_3R(ADD_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(TINITSP_2r, low);
break;
case 1:
DECODE_2R(SETD_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(FREER_1r, low);
break;
case 1:
DECODE_1R(MJOIN_1r, low);
break;
}
} else {
switch (low) {
case 0x17ec:
DECODE_0R(DENTSP_0r);
break;
case 0x17ed:
DECODE_0R(DRESTSP_0r);
break;
case 0x17ee:
DECODE_0R(GETID_0r);
break;
case 0x17ef:
DECODE_0R(GETKEP_0r);
break;
case 0x17fc:
DECODE_0R(GETKSP_0r);
break;
case 0x17fd:
DECODE_0R(LDSED_0r);
break;
case 0x17fe:
DECODE_0R(LDET_0r);
break;
}
}
break;
case 0x03: /* 0b00011 */
if (test3R(low)) {
DECODE_3R(SUB_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(TINITCP_2r, low);
break;
case 1:
DECODE_2R(TSETMR_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(TSTART_1r, low);
break;
case 1:
DECODE_1R(MSYNC_1r, low);
break;
}
}
break;
case 0x04: /* 0b00100 */
if (test3R(low)) {
DECODE_3R(SHL_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
break;
case 1:
DECODE_2R(EET_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(BLA_1r, low);
break;
case 1:
DECODE_1R(BAU_1r, low);
break;
}
}
break;
case 0x05: /* 0b00101 */
if (test3R(low)) {
DECODE_3R(SHR_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(ANDNOT_2r, low);
break;
case 1:
DECODE_2R(EEF_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(BRU_1r, low);
break;
case 1:
DECODE_1R(SETSP_1r, low);
break;
}
}
break;
case 0x06: /* 0b00110 */
if (test3R(low)) {
DECODE_3R(EQ_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(SEXT_2r, low);
break;
case 1:
DECODE_RUS(SEXT_rus, low);
OP(1) = bitpValue(OP(1));
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(SETDP_1r, low);
break;
case 1:
DECODE_1R(SETCP_1r, low);
break;
}
}
break;
case 0x07: /* 0b00111 */
if (test3R(low)) {
DECODE_3R(AND_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(GETTS_2r, low);
break;
case 1:
DECODE_2R(SETPT_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(DGETREG_1r, low);
break;
case 1:
DECODE_1R(SETEV_1r, low);
break;
}
}
break;
case 0x08: /* 0b01000 */
if (test3R(low)) {
DECODE_3R(OR_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(ZEXT_2r, low);
break;
case 1:
DECODE_RUS(ZEXT_rus, low);
OP(1) = bitpValue(OP(1));
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(KCALL_1r, low);
break;
case 1:
DECODE_1R(SETV_1r, low);
break;
}
}
break;
case 0x09: /* 0b01001 */
if (test3R(low)) {
DECODE_3R(LDW_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(OUTCT_2r, low);
break;
case 1:
DECODE_RUS(OUTCT_rus, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(ECALLF_1r, low);
break;
case 1:
DECODE_1R(ECALLT_1r, low);
break;
}
}
break;
case 0x0a: /* 0b01010 */
if (testRU6_2(low)) {
switch (bit(low, 10)) {
case 0:
DECODE_RU6(STWDP_ru6, low);
break;
case 1:
DECODE_RU6(STWSP_ru6, low);
break;
}
}
break;
case 0x0b: /* 0b01011 */
if (testRU6_2(low)) {
switch (bit(low, 10)) {
case 0:
DECODE_RU6(LDWDP_ru6, low);
break;
case 1:
DECODE_RU6(LDWSP_ru6, low);
break;
}
}
break;
case 0x0c: /* 0b01100 */
if (testRU6_2(low)) {
switch (bit(low, 10)) {
case 0:
DECODE_RU6(LDAWDP_ru6, low);
break;
case 1:
DECODE_RU6(LDAWSP_ru6, low);
break;
}
}
break;
case 0x0d: /* 0b01101 */
if (testRU6_2(low)) {
switch (bit(low, 10)) {
case 0:
DECODE_RU6(LDC_ru6, low);
break;
case 1:
DECODE_RU6(LDWCP_ru6, low);
break;
}
}
break;
case 0x0e: /* 0b01110 */
if (testRU6(low)) {
switch (bit(low, 10)) {
case 0:
DECODE_RU6(BRFT_ru6, low);
break;
case 1:
DECODE_RU6(BRBT_ru6, low);
break;
}
} else {
switch (bitRange(low, 10, 6)) {
case 0x0c:
DECODE_U6(BRFU_u6, low);
break;
case 0x0d:
DECODE_U6(BLAT_u6, low);
break;
case 0x0e:
DECODE_U6(EXTDP_u6, low);
break;
case 0x0f:
DECODE_U6(KCALL_u6, low);
break;
case 0x1c:
DECODE_U6(BRBU_u6, low);
break;
case 0x1d:
DECODE_U6(ENTSP_u6, low);
break;
case 0x1e:
DECODE_U6(EXTSP_u6, low);
break;
case 0x1f:
DECODE_U6(RETSP_u6, low);
break;
}
}
break;
case 0x0f: /* 0b01111 */
if (testRU6(low)) {
switch (bit(low, 10)) {
case 0:
DECODE_RU6(BRFF_ru6, low);
break;
case 1:
DECODE_RU6(BRBF_ru6, low);
break;
}
} else {
switch (bitRange(low, 10, 6)) {
case 0x0c:
DECODE_U6(CLRSR_u6, low);
break;
case 0x0d:
DECODE_U6(SETSR_u6, low);
break;
case 0x0e:
DECODE_U6(KENTSP_u6, low);
break;
case 0x0f:
DECODE_U6(KRESTSP_u6, low);
break;
case 0x1c:
DECODE_U6(GETSR_u6, low);
break;
case 0x1d:
DECODE_U6(LDAWCP_u6, low);
break;
}
}
break;
case 0x10: /* 0b10000 */
if (test3R(low)) {
DECODE_3R(LD16S_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_RUS(GETR_rus, low);
break;
case 1:
DECODE_2R(INCT_2r, low);
break;
}
} else if (test1R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_1R(CLRPT_1r, low);
break;
case 1:
DECODE_1R(SYNCR_1r, low);
break;
}
}
break;
case 0x11: /* 0b10001 */
if (test3R(low)) {
DECODE_3R(LD8U_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(NOT_2r, low);
break;
case 1:
DECODE_2R(INT_2r, low);
break;
}
}
break;
case 0x12: /* 0b10010 */
if (test3R(low)) {
DECODE_2RUS(ADD_2rus, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(NEG_2r, low);
break;
case 1:
DECODE_2R(ENDIN_2r, low);
break;
}
}
break;
case 0x13: /* 0b10011 */
if (test3R(low)) {
DECODE_2RUS(SUB_2rus, low);
}
break;
case 0x14: /* 0b10100 */
if (test3R(low)) {
DECODE_2RUS(SHL_2rus, low);
OP(2) = bitpValue(OP(2));
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(MKMSK_2r, low);
break;
case 1:
DECODE_RUS(MKMSK_rus, low);
OP(1) = bitpValue(OP(1));
break;
}
}
break;
case 0x15: /* 0b10101 */
if (test3R(low)) {
DECODE_2RUS(SHR_2rus, low);
OP(2) = bitpValue(OP(2));
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(OUT_2r, low);
break;
case 1:
DECODE_2R(OUTSHR_2r, low);
break;
}
}
break;
case 0x16: /* 0b10110 */
if (test3R(low)) {
DECODE_2RUS(EQ_2rus, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(IN_2r, low);
break;
case 1:
DECODE_2R(INSHR_2r, low);
break;
}
}
break;
case 0x17: /* 0b10111 */
if (test3R(low)) {
DECODE_3R(TSETR_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(PEEK_2r, low);
break;
case 1:
DECODE_2R(TESTCT_2r, low);
break;
}
}
break;
case 0x18: /* 0b11000 */
if (test3R(low)) {
DECODE_3R(LSS_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(SETPSC_2r, low);
break;
case 1:
DECODE_2R(TESTWCT_2r, low);
break;
}
}
break;
case 0x19: /* 0b11001 */
if (test3R(low)) {
DECODE_3R(LSU_3r, low);
} else if (test2R(low)) {
switch (bit(low, 4)) {
case 0:
DECODE_2R(CHKCT_2r, low);
break;
case 1:
DECODE_RUS(CHKCT_rus, low);
break;
}
}
break;
case 0x1a: /* 0b11010 */
if (bit(low, 10)) {
DECODE_U10(BLRB_u10, low);
} else {
DECODE_U10(BLRF_u10, low);
}
break;
case 0x1b: /* 0b11011 */
if (bit(low, 10)) {
DECODE_U10(LDAPB_u10, low);
} else {
DECODE_U10(LDAPF_u10, low);
}
break;
case 0x1c: /* 0b11100 */
if (bit(low, 10)) {
DECODE_U10(LDWCPL_u10, low);
} else {
DECODE_U10(BLACP_u10, low);
}
break;
case 0x1d: /* 0b11101 */
if (testRU6(low)) {
if (bit(low, 10) == 0) {
DECODE_RU6(SETC_ru6, low);
break;
}
}
break;
case PFIX:
if (bit(low, 10) == 0) {
if (!highValid) {
opcode = ILLEGAL_PC;
break;
}
uint32_t high_opc = bitRange(high, 15, 11);
switch (high_opc) {
case 0x0a: /* 0b01010 */
if (testLRU6_2(high, low)) {
switch (bit(high, 10)) {
case 0:
DECODE_LRU6(STWDP_lru6, high, low);
break;
case 1:
DECODE_LRU6(STWSP_lru6, high, low);
break;
}
}