------- Comment #4 from dberlin at gcc dot gnu dot org 2006-12-07 04:48 ------- On my machine, with an unoptimized cc1plus (IE stage1), the first one, at -O2 takes 150meg of memory total, and 221 seconds, with most of the time being verifiers. This is with local PTA changes to speed up PTA
TOTAL : 221.58 17.76 271.63 note: tree SSA verifier : 51.90 (23%) usr 0.89 ( 5%) sys 56.19 (21%) wall 74 kB ( 0%) ggc tree STMT verifier : 40.15 (18%) usr 0.88 ( 5%) sys 41.12 (15%) wall etc The *other* case is spending all it's alias time checking for dups in add_may_alias, which diego's patch should fix. There is also a ton of time elsewhere: tree alias analysis : 71.28 (21%) usr 1.66 ( 9%) sys 114.75 (26%) wall 18776 kB ( 5%) ggc tree SSA verifier : 33.40 (10%) usr 0.43 ( 2%) sys 34.55 ( 8%) wall 259 kB ( 0%) ggc tree STMT verifier : 30.43 ( 9%) usr 0.64 ( 3%) sys 31.04 ( 7%) wall 0 kB ( 0%) ggc PRE : 64.49 (19%) usr 0.64 ( 3%) sys 75.84 (17%) wall 1086 kB ( 0%) ggc scheduling 2 : 46.21 (14%) usr 0.35 ( 2%) sys 62.71 (14%) wall 2328 kB ( 1%) ggc TOTAL : 339.09 19.05 444.66 (it was in a debugger for about 100s to get some idea of what was going on). But on my machine, it still only uses 350 meg of memory On x86_64, i expect about double memory usage. I also expect if i tested bootstrapped optimized compilers, i'd get the same times you are expecting, excluding checking time This leaves a few possibilities: 1 My local PTA improvements are helping this 2 Something is very different on x86_64 3 My preprocessing using Apple G++ 4.0.1 is giving very different code to play with than mainline does 4 The regression is already fixed :) I can either send you the patch to test for 1, or you can wait a few days for me to commit it -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30089
