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Merge pull request #285 from lioncash/uxtab16 

armemu: Implement UXTAB16
This commit is contained in:
bunnei 2014-12-15 22:29:12 -05:00
parent cd2a31eaf4 1c7f77334c
commit a8098187aa
1 changed files with 25 additions and 10 deletions
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35
src/core/arm/interpreter/armemu.cpp
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@ -6101,17 +6101,32 @@ L_stm_s_takeabort:
return 1;
}
case 0x6c:
if ((instr & 0xf03f0) == 0xf0070) { //uxtb16
u8 rm_idx = BITS(0, 3);
u8 rd_idx = BITS(12, 15);
u32 rm_val = state->Reg[rm_idx];
u32 rotation = BITS(10, 11) * 8;
u32 in = ((rm_val << (32 - rotation)) | (rm_val >> rotation));
state->Reg[rd_idx] = in & 0x00FF00FF;
case 0x6c: // UXTB16 and UXTAB16
{
const u8 rm_idx = BITS(0, 3);
const u8 rn_idx = BITS(16, 19);
const u8 rd_idx = BITS(12, 15);
const u32 rm_val = state->Reg[rm_idx];
const u32 rn_val = state->Reg[rn_idx];
const u32 rotation = BITS(10, 11) * 8;
const u32 rotated_rm = ((rm_val << (32 - rotation)) | (rm_val >> rotation));
// UXTB16
if ((instr & 0xf03f0) == 0xf0070) {
state->Reg[rd_idx] = rotated_rm & 0x00FF00FF;
}
else { // UXTAB16
const u8 lo_rotated = (rotated_rm & 0xFF);
const u16 lo_result = (rn_val & 0xFFFF) + (u16)lo_rotated;
const u8 hi_rotated = (rotated_rm >> 16) & 0xFF;
const u16 hi_result = (rn_val >> 16) + (u16)hi_rotated;
state->Reg[rd_idx] = ((hi_result << 16) | (lo_result & 0xFFFF));
}
return 1;
} else
printf ("Unhandled v6 insn: uxtab16\n");
}
break;
case 0x6e: {
ARMword Rm;