• Ian Romanick's avatar
    intel/fs: Allow cmod propagation across reads and writes of different flags · e13a5c7d
    Ian Romanick authored
    This also helps a later patch (intel/fs: Improve discard_if code
    generation) on about 200 shaders.
    
    v2: Document that other instruction sequences are also valid in
    subtract_merge_with_compare_intervening_mismatch_flag_write.  Suggested
    by Caio.
    
    All Intel platforms had similar results. (Ice Lake shown)
    total instructions in shared programs: 17224438 -> 17224434 (<.01%)
    instructions in affected programs: 296 -> 292 (-1.35%)
    helped: 4
    HURT: 0
    helped stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1
    helped stats (rel) min: 0.99% max: 1.92% x̄: 1.43% x̃: 1.40%
    95% mean confidence interval for instructions value: -1.00 -1.00
    95% mean confidence interval for instructions %-change: -2.04% -0.81%
    Instructions are helped.
    
    total cycles in shared programs: 361468455 -> 361468458 (<.01%)
    cycles in affected programs: 2862 -> 2865 (0.10%)
    helped: 2
    HURT: 2
    helped stats (abs) min: 2 max: 2 x̄: 2.00 x̃: 2
    helped stats (rel) min: 0.24% max: 0.39% x̄: 0.31% x̃: 0.31%
    HURT stats (abs)   min: 3 max: 4 x̄: 3.50 x̃: 3
    HURT stats (rel)   min: 0.32% max: 0.70% x̄: 0.51% x̃: 0.51%
    95% mean confidence interval for cycles value: -4.34 5.84
    95% mean confidence interval for cycles %-change: -0.70% 0.90%
    Inconclusive result (value mean confidence interval includes 0).
    Reviewed-by: Caio Marcelo de Oliveira Filho's avatarCaio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
    Reviewed-by: Matt Turner's avatarMatt Turner <mattst88@gmail.com>
    e13a5c7d
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