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| author | Richard Henderson <rth@twiddle.net> | 2016-04-05 19:43:40 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2017-02-14 08:15:00 +1100 |
| commit | 6597c28d618a3d16d468770b7c30a0237a8c8ea9 (patch) | |
| tree | 45f88af4cf649ce36afadd421965ae88d5173ea6 /hw/intc | |
| parent | a01deb36a685365b4a3117112da3cc4f0f79e955 (diff) | |
| download | focaccia-qemu-6597c28d618a3d16d468770b7c30a0237a8c8ea9.tar.gz focaccia-qemu-6597c28d618a3d16d468770b7c30a0237a8c8ea9.zip | |
target/openrisc: Optimize for r0 being zero
The HW does not special-case r0, but the ABI specifies that r0 should contain 0. If we expose this fact to the optimizer, we can simplify a lot of the generated code. We must of course verify that r0==0, but that is trivial to do with a TB flag. Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'hw/intc')
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