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cd85f711c0
We need to make sure that when we combine loads, we only do so if there are no other uses of the load. We can't split one load into two because that can then lead to inconsistent loaded values in the presence of races. Add some aggressive copy removal code so that phantom "dead copy" uses of values are cleaned up promptly. This lets us use x.Uses==1 conditions reliably. Change-Id: I9037311db85665f3868dbeb3adb3de5c20728b38 Reviewed-on: https://go-review.googlesource.com/21853 Reviewed-by: Todd Neal <todd@tneal.org> |
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