Bug 1707774 Comment 25 Edit History

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Original comment by
on 
In a sense, it seems to me that the bug is that when the input nodes are the same, we should not be required or allowed to specify a use for the rhs because its use is already specified.
Revision 1 by
on 
In a sense, it seems to me that the bug is that when the input nodes are the same, we should not be required or allowed to specify a use for the rhs because its use is already specified.

To wit, this code for multiply lowering:
```
  if (lhs == rhs) {
    LUse def = useRegisterAtStart(lhs);
    lir->setOperand(0, def);
    lir->setOperand(1, def);
  } else {
    lir->setOperand(1, useRegister(rhs));
  }
  defineReuseInput(lir, mul, 0);
```
passes the regalloc and generates good code.

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