80b3ff9f82
Replaced use of rotate instructions (RCRQ, RCLQ) with ADDQ/SBBQ for restoring/saving the carry flag per suggestion from Torbjörn Granlund (author of GMP bignum libs for C). The rotate instructions tend to be slower on todays machines. benchmark old ns/op new ns/op delta BenchmarkAddVV_1 5.69 5.51 -3.16% BenchmarkAddVV_2 7.15 6.87 -3.92% BenchmarkAddVV_3 8.69 8.06 -7.25% BenchmarkAddVV_4 8.10 8.13 +0.37% BenchmarkAddVV_5 8.37 8.47 +1.19% BenchmarkAddVV_1e1 13.1 12.0 -8.40% BenchmarkAddVV_1e2 78.1 69.4 -11.14% BenchmarkAddVV_1e3 815 656 -19.51% BenchmarkAddVV_1e4 8137 7345 -9.73% BenchmarkAddVV_1e5 100127 93909 -6.21% BenchmarkAddVW_1 4.86 4.71 -3.09% BenchmarkAddVW_2 5.67 5.50 -3.00% BenchmarkAddVW_3 6.51 6.34 -2.61% BenchmarkAddVW_4 6.69 6.66 -0.45% BenchmarkAddVW_5 7.20 7.21 +0.14% BenchmarkAddVW_1e1 10.0 9.34 -6.60% BenchmarkAddVW_1e2 45.4 52.3 +15.20% BenchmarkAddVW_1e3 417 491 +17.75% BenchmarkAddVW_1e4 4760 4852 +1.93% BenchmarkAddVW_1e5 69107 67717 -2.01% benchmark old MB/s new MB/s speedup BenchmarkAddVV_1 11241.82 11610.28 1.03x BenchmarkAddVV_2 17902.68 18631.82 1.04x BenchmarkAddVV_3 22082.43 23835.64 1.08x BenchmarkAddVV_4 31588.18 31492.06 1.00x BenchmarkAddVV_5 38229.90 37783.17 0.99x BenchmarkAddVV_1e1 48891.67 53340.91 1.09x BenchmarkAddVV_1e2 81940.61 92191.86 1.13x BenchmarkAddVV_1e3 78443.09 97480.44 1.24x BenchmarkAddVV_1e4 78644.18 87129.50 1.11x BenchmarkAddVV_1e5 63918.48 68150.84 1.07x BenchmarkAddVW_1 13165.09 13581.00 1.03x BenchmarkAddVW_2 22588.04 23275.41 1.03x BenchmarkAddVW_3 29483.82 30303.96 1.03x BenchmarkAddVW_4 38286.54 38453.21 1.00x BenchmarkAddVW_5 44414.57 44370.59 1.00x BenchmarkAddVW_1e1 63816.84 68494.08 1.07x BenchmarkAddVW_1e2 140885.41 122427.16 0.87x BenchmarkAddVW_1e3 153258.31 130325.28 0.85x BenchmarkAddVW_1e4 134447.63 131904.02 0.98x BenchmarkAddVW_1e5 92609.41 94509.88 1.02x Change-Id: Ia473e9ab9c63a955c252426684176bca566645ae Reviewed-on: https://go-review.googlesource.com/2503 Reviewed-by: Keith Randall <khr@golang.org> |
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