Ian Romanick
cb3e21cd19
Instead of emitting ~(a & b), emit (~a | ~b) since logical-not of operands is free on Gen8+. v2: Fix swizzles. Fix types for cmod propagation. v3: Simplify logic for inverting source of inot(ixor(a, b)). Suggested by Ken. Skylake and Broadwell had similar results. (Skylake shown) Skylake total instructions in shared programs: 15185593 -> 15185583 (<.01%) instructions in affected programs: 5673 -> 5663 (-0.18%) helped: 12 HURT: 1 helped stats (abs) min: 1 max: 2 x̄: 1.17 x̃: 1 helped stats (rel) min: 0.30% max: 5.88% x̄: 1.50% x̃: 0.70% HURT stats (abs) min: 4 max: 4 x̄: 4.00 x̃: 4 HURT stats (rel) min: 0.12% max: 0.12% x̄: 0.12% x̃: 0.12% 95% mean confidence interval for instructions value: -1.66 0.13 95% mean confidence interval for instructions %-change: -2.60% -0.15% Inconclusive result (value mean confidence interval includes 0). total cycles in shared programs: 370977726 -> 370964249 (<.01%) cycles in affected programs: 869987 -> 856510 (-1.55%) helped: 15 HURT: 2 helped stats (abs) min: 2 max: 6640 x̄: 902.20 x̃: 16 helped stats (rel) min: <.01% max: 4.92% x̄: 1.71% x̃: 1.53% HURT stats (abs) min: 14 max: 42 x̄: 28.00 x̃: 28 HURT stats (rel) min: 1.08% max: 3.18% x̄: 2.13% x̃: 2.13% 95% mean confidence interval for cycles value: -1654.87 69.34 95% mean confidence interval for cycles %-change: -2.29% -0.23% Inconclusive result (value mean confidence interval includes 0). Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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