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Improve RSP accuracy by backporting changes from simple64 #1153

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Improve RSP accuracy by backporting changes from simple64 #1153

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@Rosalie241 Rosalie241 commented Sep 26, 2025 •
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This fixes all RSP tests with the interpreter, a LLE video plugin & parallel RSP:

[CORE]  IS64: n64-systemtest 2.1.0 (base=1 timing=0 cycle=0 cp0-hazards=0)
[CORE]  IS64: Finished in 4.28s. Base: Failed 0 of 305 tests (100% success rate)
[CORE]  IS64: 
[CORE]  IS64: Slowest tests: RSP VRSQ (all 16 bit values) (0.25s), RSP VRCP (all 16 bit values) (0.24s), RSP VLT (0.09s), RSP VGE (0.09s), RSP VADD (0.09s)

n64-systemtest-rsp.zip

This also requires a parallel-rsp patch: libretro/parallel-rsp#17

This was referenced Sep 26, 2025
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