armemu: Implement QADD8/QSUB8
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Lioncash
parent
472ec0d0cf
commit
7ad400d5a7
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@ -5948,56 +5948,58 @@ L_stm_s_takeabort:
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printf("Unhandled v6 insn: %08x", instr);
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}
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break;
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case 0x62: // QADD16, QASX, QSAX, and QSUB16
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if ((instr & 0xFF0) == 0xf10 || (instr & 0xFF0) == 0xf30 ||
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(instr & 0xFF0) == 0xf50 || (instr & 0xFF0) == 0xf70)
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case 0x62: // QADD16, QASX, QSAX, QSUB16, QADD8, and QSUB8
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{
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const u8 op2 = BITS(5, 7);
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const u8 rd_idx = BITS(12, 15);
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const u8 rn_idx = BITS(16, 19);
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const u8 rm_idx = BITS(0, 3);
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const s16 rm_lo = (state->Reg[rm_idx] & 0xFFFF);
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const s16 rm_hi = ((state->Reg[rm_idx] >> 0x10) & 0xFFFF);
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const s16 rn_lo = (state->Reg[rn_idx] & 0xFFFF);
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const s16 rn_hi = ((state->Reg[rn_idx] >> 0x10) & 0xFFFF);
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const u16 rm_lo = (state->Reg[rm_idx] & 0xFFFF);
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const u16 rm_hi = ((state->Reg[rm_idx] >> 0x10) & 0xFFFF);
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const u16 rn_lo = (state->Reg[rn_idx] & 0xFFFF);
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const u16 rn_hi = ((state->Reg[rn_idx] >> 0x10) & 0xFFFF);
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s32 lo_result;
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s32 hi_result;
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u16 lo_result = 0;
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u16 hi_result = 0;
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// QADD16
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if ((instr & 0xFF0) == 0xf10) {
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lo_result = (rn_lo + rm_lo);
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hi_result = (rn_hi + rm_hi);
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if (op2 == 0x00) {
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lo_result = ARMul_SignedSaturatedAdd16(rn_lo, rm_lo);
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hi_result = ARMul_SignedSaturatedAdd16(rn_hi, rm_hi);
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}
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// QASX
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else if ((instr & 0xFF0) == 0xf30) {
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lo_result = (rn_lo - rm_hi);
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hi_result = (rn_hi + rm_lo);
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else if (op2 == 0x01) {
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lo_result = ARMul_SignedSaturatedSub16(rn_lo, rm_hi);
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hi_result = ARMul_SignedSaturatedAdd16(rn_hi, rm_lo);
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}
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// QSAX
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else if ((instr & 0xFF0) == 0xf50) {
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lo_result = (rn_lo + rm_hi);
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hi_result = (rn_hi - rm_lo);
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else if (op2 == 0x02) {
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lo_result = ARMul_SignedSaturatedAdd16(rn_lo, rm_hi);
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hi_result = ARMul_SignedSaturatedSub16(rn_hi, rm_lo);
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}
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// QSUB16
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else {
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lo_result = (rn_lo - rm_lo);
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hi_result = (rn_hi - rm_hi);
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else if (op2 == 0x03) {
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lo_result = ARMul_SignedSaturatedSub16(rn_lo, rm_lo);
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hi_result = ARMul_SignedSaturatedSub16(rn_hi, rm_hi);
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}
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// QADD8
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else if (op2 == 0x04) {
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lo_result = ARMul_SignedSaturatedAdd8(rn_lo & 0xFF, rm_lo & 0xFF) |
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ARMul_SignedSaturatedAdd8(rn_lo >> 8, rm_lo >> 8) << 8;
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hi_result = ARMul_SignedSaturatedAdd8(rn_hi & 0xFF, rm_hi & 0xFF) |
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ARMul_SignedSaturatedAdd8(rn_hi >> 8, rm_hi >> 8) << 8;
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}
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// QSUB8
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else if (op2 == 0x07) {
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lo_result = ARMul_SignedSaturatedSub8(rn_lo & 0xFF, rm_lo & 0xFF) |
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ARMul_SignedSaturatedSub8(rn_lo >> 8, rm_lo >> 8) << 8;
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hi_result = ARMul_SignedSaturatedSub8(rn_hi & 0xFF, rm_hi & 0xFF) |
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ARMul_SignedSaturatedSub8(rn_hi >> 8, rm_hi >> 8) << 8;
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}
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if (lo_result > 0x7FFF)
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lo_result = 0x7FFF;
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else if (lo_result < -0x8000)
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lo_result = -0x8000;
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if (hi_result > 0x7FFF)
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hi_result = 0x7FFF;
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else if (hi_result < -0x8000)
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hi_result = -0x8000;
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state->Reg[rd_idx] = (lo_result & 0xFFFF) | ((hi_result & 0xFFFF) << 16);
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return 1;
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} else {
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printf("Unhandled v6 insn: %08x", BITS(20, 27));
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}
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break;
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case 0x63:
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@ -478,6 +478,66 @@ ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
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ASSIGNV (SubOverflow (a, b, result));
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}
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/* 8-bit signed saturated addition */
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u8 ARMul_SignedSaturatedAdd8(u8 left, u8 right)
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{
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u8 result = left + right;
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if (((result ^ left) & 0x80) && ((left ^ right) & 0x80) == 0) {
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if (left & 0x80)
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result = 0x80;
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else
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result = 0x7F;
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}
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return result;
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}
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/* 8-bit signed saturated subtraction */
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u8 ARMul_SignedSaturatedSub8(u8 left, u8 right)
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{
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u8 result = left - right;
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if (((result ^ left) & 0x80) && ((left ^ right) & 0x80) != 0) {
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if (left & 0x80)
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result = 0x80;
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else
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result = 0x7F;
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}
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return result;
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}
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/* 16-bit signed saturated addition */
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u16 ARMul_SignedSaturatedAdd16(u16 left, u16 right)
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{
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u16 result = left + right;
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if (((result ^ left) & 0x8000) && ((left ^ right) & 0x8000) == 0) {
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if (left & 0x8000)
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result = 0x8000;
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else
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result = 0x7FFF;
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}
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return result;
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}
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/* 16-bit signed saturated subtraction */
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u16 ARMul_SignedSaturatedSub16(u16 left, u16 right)
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{
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u16 result = left - right;
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if (((result ^ left) & 0x8000) && ((left ^ right) & 0x8000) != 0) {
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if (left & 0x8000)
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result = 0x8000;
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else
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result = 0x7FFF;
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}
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return result;
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}
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/* 8-bit unsigned saturated addition */
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u8 ARMul_UnsignedSaturatedAdd8(u8 left, u8 right)
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{
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@ -790,6 +790,11 @@ extern void ARMul_FixSPSR(ARMul_State*, ARMword, ARMword);
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extern void ARMul_ConsolePrint(ARMul_State*, const char*, ...);
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extern void ARMul_SelectProcessor(ARMul_State*, unsigned);
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extern u8 ARMul_SignedSaturatedAdd8(u8, u8);
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extern u8 ARMul_SignedSaturatedSub8(u8, u8);
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extern u16 ARMul_SignedSaturatedAdd16(u16, u16);
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extern u16 ARMul_SignedSaturatedSub16(u16, u16);
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extern u8 ARMul_UnsignedSaturatedAdd8(u8, u8);
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extern u16 ARMul_UnsignedSaturatedAdd16(u16, u16);
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extern u8 ARMul_UnsignedSaturatedSub8(u8, u8);
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