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authorEric Anholt <[email protected]>2017-05-04 14:44:38 -0700
committerEric Anholt <[email protected]>2017-07-25 14:55:10 -0700
commit53492917e2153e9f5eb503792c2793a8e4cba391 (patch)
tree6a76eb0df685965c0670827da142bee1abb0f595 /src/broadcom/cle
parent7a34a0e8903249c41fae06fea22be105caf290df (diff)
broadcom/vc4: Use the RA callback to improve register selection's choices.
We simply pick r4 if available (anything else would force a MOV), then round-robin through accumulators (avoids physical regfile RAW delay slots), then round-robin through the physical regfile. The effect on instruction count is pretty impressive: total instructions in shared programs: 76563 -> 74526 (-2.66%) instructions in affected programs: 66463 -> 64426 (-3.06%) and we could probably do better with a little heuristic of "if we're going to choose a physical reg, and other operands of instructions using this as a src have the same physical regfile, then use the other regfile".
Diffstat (limited to 'src/broadcom/cle')
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