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r243052 - /branches/ARM/sve-branch/gcc/tree-ssa...
- From: rsandifo at gcc dot gnu dot org
- To: gcc-cvs at gcc dot gnu dot org
- Date: Wed, 30 Nov 2016 19:07:33 -0000
- Subject: r243052 - /branches/ARM/sve-branch/gcc/tree-ssa...
Date: Wed Nov 30 19:07:33 2016
New Revision: 243052
Tweak handling of zero address costs
[Branch only patch -- not intended for trunk in its current state]
If ivopts sees an address that needs no set-up and has a cost of 0, it
will change the cost to 1. However, if that same address needs set-up,
ivopts will keep the address cost itself as 0 and just use the cost of
the set-up. This seems to favour the second (non-native) address
slightly more than it should.
This patch makes sure that the address has a consistent cost
and that any set-up is added on top of that.
We should revisit this to see whether it's justifiable as a trunk
patch or whether it doesn't make that much difference.