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Bug 965236 - ARM simulator: Add support for the udiv instruction. r=nbp

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This commit is contained in:
Douglas Crosher 2014-02-04 19:51:40 +11:00
parent 89d70ec556
commit d1b25f0455
1 changed files with 27 additions and 17 deletions
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44
js/src/jit/arm/Simulator-arm.cpp
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@ -2931,23 +2931,33 @@ Simulator::decodeType3(SimInstruction *instr)
break;
}
case db_x: { // sudiv
if (!instr->hasW()) {
if (instr->bits(5, 4) == 0x1) {
if ((instr->bit(22) == 0x0) && (instr->bit(20) == 0x1)) {
// sdiv (in V8 notation matching ARM ISA format) rn = rm/rs
int rm = instr->rmValue();
int32_t rm_val = get_register(rm);
int rs = instr->rsValue();
int32_t rs_val = get_register(rs);
int32_t ret_val = 0;
MOZ_ASSERT(rs_val != 0);
if ((rm_val == INT32_MIN) && (rs_val == -1))
ret_val = INT32_MIN;
else
ret_val = rm_val / rs_val;
set_register(rn, ret_val);
return;
}
if (instr->bit(22) == 0x0 && instr->bit(20) == 0x1 &&
instr->bits(15,12) == 0x0f && instr->bits(7, 4) == 0x1) {
if (!instr->hasW()) {
// sdiv (in V8 notation matching ARM ISA format) rn = rm/rs
int rm = instr->rmValue();
int32_t rm_val = get_register(rm);
int rs = instr->rsValue();
int32_t rs_val = get_register(rs);
int32_t ret_val = 0;
MOZ_ASSERT(rs_val != 0);
if ((rm_val == INT32_MIN) && (rs_val == -1))
ret_val = INT32_MIN;
else
ret_val = rm_val / rs_val;
set_register(rn, ret_val);
return;
} else {
// udiv (in V8 notation matching ARM ISA format) rn = rm/rs
int rm = instr->rmValue();
uint32_t rm_val = get_register(rm);
int rs = instr->rsValue();
uint32_t rs_val = get_register(rs);
uint32_t ret_val = 0;
MOZ_ASSERT(rs_val != 0);
ret_val = rm_val / rs_val;
set_register(rn, ret_val);
return;
}
}