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generated code over the simple spiller. The new local spiller generates substantially better code than the simple one in some cases, by reusing values that are loaded out of stack slots and kept available in registers. This primarily helps programs that are spilling a lot, and there is still stuff that can be done to improve it. This patch makes the local spiller the default, as it's only a tiny bit slower than the simple spiller (it increases the runtime of llc by < 1%). Here are some numbers with speedups. Program #reuse old(s) new(s) Speedup Povray: 3452, 16.87 -> 15.93 (5.5%) 177.mesa: 2176, 2.77 -> 2.76 (0%) 179.art: 35, 28.43 -> 28.01 (1.5%) 183.equake: 55, 61.44 -> 61.41 (0%) 188.ammp: 869, 174 -> 149 (15%) 164.gzip: 43, 40.73 -> 40.71 (0%) 175.vpr: 351, 18.54 -> 17.34 (6.5%) 176.gcc: 2471, 5.01 -> 4.92 (1.8%) 181.mcf 42, 79.30 -> 75.20 (5.2%) 186.crafty: 484, 29.73 -> 30.04 (-1%) 197.parser: 251, 10.47 -> 10.67 (-1%) 252.eon: 1501, 1.98 -> 1.75 (12%) 253.perlbm: 1183, 14.83 -> 14.42 (2.8%) 254.gap: 825, 7.46 -> 7.29 (2.3%) 255.vortex: 285, 10.51 -> 10.27 (2.3%) 256.bzip2: 63, 55.70 -> 55.20 (0.9%) 300.twolf: 830, 21.63 -> 22.00 (-1%) PtrDist/ks 14, 32.75 -> 17.53 (46.5%) Olden/tsp 46, 8.71 -> 8.24 (5.4%) Free/distray 70, 1.09 -> 0.99 (9.2%) llvm-svn: 16629
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the HTML documentation provided in docs/index.html for further assistance with LLVM.