Register dividend = ToRegister(instr->dividend());
Register result = ToRegister(instr->result());
int32_t divisor = instr->divisor();
- Register scratch = scratch0();
- ASSERT(!scratch.is(dividend));
+ Register scratch = result.is(dividend) ? scratch0() : dividend;
+ ASSERT(!result.is(dividend) || !scratch.is(dividend));
// If the divisor is 1, return the dividend.
if (divisor == 1) {
// If the divisor is negative, we have to negate and handle edge cases.
if (instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
+ // divident can be the same register as result so save the value of it
+ // for checking overflow.
__ Move(scratch, dividend);
}
__ Subu(result, zero_reg, dividend);
DeoptimizeIf(eq, instr->environment(), result, Operand(zero_reg));
}
- // If the negation could not overflow, simply shifting is OK.
- if (!instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
- __ sra(result, dividend, shift);
- return;
- }
-
// Dividing by -1 is basically negation, unless we overflow.
__ Xor(at, scratch, result);
if (divisor == -1) {
- DeoptimizeIf(ge, instr->environment(), at, Operand(zero_reg));
+ if (instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
+ DeoptimizeIf(ge, instr->environment(), at, Operand(zero_reg));
+ }
+ return;
+ }
+
+ // If the negation could not overflow, simply shifting is OK.
+ if (!instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
+ __ sra(result, result, shift);
return;
}
__ li(result, Operand(kMinInt / divisor));
__ Branch(&done);
__ bind(&no_overflow);
- __ sra(result, dividend, shift);
+ __ sra(result, result, shift);
__ bind(&done);
}