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armemu: Implement UQADD8, UQADD16, UQSUB16, UQASX, and UQSAX

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Lioncash 2014-12-27 17:06:19 -05:00
parent 28e64806cd
commit 60523113a9
3 changed files with 92 additions and 18 deletions
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65
src/core/arm/interpreter/armemu.cpp
View file

@ -6117,26 +6117,55 @@ L_stm_s_takeabort:
}
printf("Unhandled v6 insn: uasx/usax\n");
break;
case 0x66:
if ((instr & 0x0FF00FF0) == 0x06600FF0) { //uqsub8
u32 rd = (instr >> 12) & 0xF;
u32 rm = (instr >> 16) & 0xF;
u32 rn = (instr >> 0) & 0xF;
u32 subfrom = state->Reg[rm];
u32 tosub = state->Reg[rn];
case 0x66: // UQADD16, UQASX, UQSAX, UQSUB16, UQADD8, and UQSUB8
{
const u8 rd_idx = BITS(12, 15);
const u8 rm_idx = BITS(0, 3);
const u8 rn_idx = BITS(16, 19);
const u8 op2 = BITS(5, 7);
const u32 rm_val = state->Reg[rm_idx];
const u32 rn_val = state->Reg[rn_idx];
u8 b1 = (u8)((u8)(subfrom)-(u8)(tosub));
if (b1 > (u8)(subfrom)) b1 = 0;
u8 b2 = (u8)((u8)(subfrom >> 8) - (u8)(tosub >> 8));
if (b2 > (u8)(subfrom >> 8)) b2 = 0;
u8 b3 = (u8)((u8)(subfrom >> 16) - (u8)(tosub >> 16));
if (b3 > (u8)(subfrom >> 16)) b3 = 0;
u8 b4 = (u8)((u8)(subfrom >> 24) - (u8)(tosub >> 24));
if (b4 > (u8)(subfrom >> 24)) b4 = 0;
state->Reg[rd] = (u32)(b1 | b2 << 8 | b3 << 16 | b4 << 24);
u16 lo_val = 0;
u16 hi_val = 0;
// UQADD16
if (op2 == 0x00) {
lo_val = ARMul_UnsignedSaturatedAdd16(rn_val & 0xFFFF, rm_val & 0xFFFF);
hi_val = ARMul_UnsignedSaturatedAdd16((rn_val >> 16) & 0xFFFF, (rm_val >> 16) & 0xFFFF);
}
// UQASX
else if (op2 == 0x01) {
lo_val = ARMul_UnsignedSaturatedSub16(rn_val & 0xFFFF, (rm_val >> 16) & 0xFFFF);
hi_val = ARMul_UnsignedSaturatedAdd16((rn_val >> 16) & 0xFFFF, rm_val & 0xFFFF);
}
// UQSAX
else if (op2 == 0x02) {
lo_val = ARMul_UnsignedSaturatedAdd16(rn_val & 0xFFFF, (rm_val >> 16) & 0xFFFF);
hi_val = ARMul_UnsignedSaturatedSub16((rn_val >> 16) & 0xFFFF, rm_val & 0xFFFF);
}
// UQSUB16
else if (op2 == 0x03) {
lo_val = ARMul_UnsignedSaturatedSub16(rn_val & 0xFFFF, rm_val & 0xFFFF);
hi_val = ARMul_UnsignedSaturatedSub16((rn_val >> 16) & 0xFFFF, (rm_val >> 16) & 0xFFFF);
}
// UQADD8
else if (op2 == 0x04) {
lo_val = ARMul_UnsignedSaturatedAdd8(rn_val, rm_val) |
ARMul_UnsignedSaturatedAdd8(rn_val >> 8, rm_val >> 8) << 8;
hi_val = ARMul_UnsignedSaturatedAdd8(rn_val >> 16, rm_val >> 16) |
ARMul_UnsignedSaturatedAdd8(rn_val >> 24, rm_val >> 24) << 8;
}
// UQSUB8
else {
lo_val = ARMul_UnsignedSaturatedSub8(rn_val, rm_val) |
ARMul_UnsignedSaturatedSub8(rn_val >> 8, rm_val >> 8) << 8;
hi_val = ARMul_UnsignedSaturatedSub8(rn_val >> 16, rm_val >> 16) |
ARMul_UnsignedSaturatedSub8(rn_val >> 24, rm_val >> 24) << 8;
}
state->Reg[rd_idx] = ((lo_val & 0xFFFF) | hi_val << 16);
return 1;
} else {
printf ("Unhandled v6 insn: uqsub16\n");
}
break;
case 0x67: // UHADD16, UHASX, UHSAX, UHSUB16, UHADD8, and UHSUB8.

41
src/core/arm/interpreter/armsupp.cpp
View file

@ -469,6 +469,47 @@ ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
ASSIGNV (SubOverflow (a, b, result));
}
/* 8-bit unsigned saturated addition */
u8 ARMul_UnsignedSaturatedAdd8(u8 left, u8 right)
{
u8 result = left + right;
if (result < left)
result = 0xFF;
return result;
}
/* 16-bit unsigned saturated addition */
u16 ARMul_UnsignedSaturatedAdd16(u16 left, u16 right)
{
u16 result = left + right;
if (result < left)
result = 0xFFFF;
return result;
}
/* 8-bit unsigned saturated subtraction */
u8 ARMul_UnsignedSaturatedSub8(u8 left, u8 right)
{
if (left <= right)
return 0;
return left - right;
}
/* 16-bit unsigned saturated subtraction */
u16 ARMul_UnsignedSaturatedSub16(u16 left, u16 right)
{
if (left <= right)
return 0;
return left - right;
}
/* This function does the work of generating the addresses used in an
LDC instruction. The code here is always post-indexed, it's up to the
caller to get the input address correct and to handle base register

4
src/core/arm/skyeye_common/armemu.h
View file

@ -603,6 +603,10 @@ extern void ARMul_MSRCpsr (ARMul_State *, ARMword, ARMword);
extern void ARMul_SubOverflow (ARMul_State *, ARMword, ARMword, ARMword);
extern void ARMul_AddOverflow (ARMul_State *, ARMword, ARMword, ARMword);
extern void ARMul_AddOverflowQ(ARMul_State*, ARMword, ARMword);
extern u8 ARMul_UnsignedSaturatedAdd8(u8, u8);
extern u16 ARMul_UnsignedSaturatedAdd16(u16, u16);
extern u8 ARMul_UnsignedSaturatedSub8(u8, u8);
extern u16 ARMul_UnsignedSaturatedSub16(u16, u16);
extern void ARMul_SubCarry (ARMul_State *, ARMword, ARMword, ARMword);
extern void ARMul_AddCarry (ARMul_State *, ARMword, ARMword, ARMword);
extern tdstate ARMul_ThumbDecode (ARMul_State *, ARMword, ARMword, ARMword *);