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Rather than using a regalloc based on live internals, computed hastily with repeated invocations of a forward-analysis pass, we switch to compute liveness information on a per-block basis. Within a given basic block, we compute liveness backwards with a linear-time algorithm; for common shaders, this may help RA terminate quicker. Across blocks, we use a work list (really a work set) and check if we're making progress. This isn't terribly efficient, but it gets the job done. Point is, we get the live_in/live_out for each block. From there, it's simple to rerun the linear-time update algorithm to compute the interference graph. The benefit of this technique is the ability to ignore "gaps" in liveness across intermediate blocks that are never executed. On simple shaders like the loops in glmark, this results in a minor reduction in register pressure. The motivation was a complex shader in Krita that failed register allocation due to an unfortunate interaction between texture pipeline registers and control flow. This shader now compiles successfully. total instructions in shared programs: 3439 -> 3438 (-0.03%) instructions in affected programs: 22 -> 21 (-4.55%) helped: 1 HURT: 0 total bundles in shared programs: 2077 -> 2076 (-0.05%) bundles in affected programs: 12 -> 11 (-8.33%) helped: 1 HURT: 0 total quadwords in shared programs: 3457 -> 3456 (-0.03%) quadwords in affected programs: 20 -> 19 (-5.00%) helped: 1 HURT: 0 total registers in shared programs: 341 -> 338 (-0.88%) registers in affected programs: 9 -> 6 (-33.33%) helped: 3 HURT: 0 helped stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1 helped stats (rel) min: 33.33% max: 33.33% x̄: 33.33% x̃: 33.33% Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> |
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| bifrost | ||
| include | ||
| midgard | ||
| pandecode | ||
| shared | ||
| Android.mk | ||
| Android.shared.mk | ||
| Makefile.sources | ||
| meson.build | ||