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Re: optimization/2001: [3.2/3.3 regression] Inordinately long compiletimes in reload CSE regs
- From: Steven Bosscher <s dot bosscher at student dot tudelft dot nl>
- To: gcc-gnats at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org,lucier at math dot purdue dot edu, nobody at gcc dot gnu dot org
- Date: Wed, 12 Mar 2003 00:48:54 +0100
- Subject: Re: optimization/2001: [3.2/3.3 regression] Inordinately long compiletimes in reload CSE regs
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=2001
Brad, the last time you confirmed this ugly bug is 5 months ago, do you
still see this? If so, maybe this is an Alpha-specific problem? On my
ol' slow K6-2, I get a very reasonable compile time (with -march=i586
-fPIC -O2 -fno-math-errno):
Execution times (seconds)
cfg construction : 0.09 ( 1%) usr 0.01 ( 3%) sys 0.10 ( 1%) wall
cfg cleanup : 0.33 ( 3%) usr 0.00 ( 0%) sys 0.33 ( 3%) wall
trivially dead code : 0.12 ( 1%) usr 0.00 ( 0%) sys 0.12 ( 1%) wall
life analysis : 0.39 ( 4%) usr 0.00 ( 0%) sys 0.39 ( 3%) wall
life info update : 0.14 ( 1%) usr 0.00 ( 0%) sys 0.18 ( 2%) wall
alias analysis : 0.14 ( 1%) usr 0.00 ( 0%) sys 0.14 ( 1%) wall
register scan : 0.06 ( 1%) usr 0.00 ( 0%) sys 0.06 ( 1%) wall
rebuild jump labels : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
preprocessing : 0.10 ( 1%) usr 0.03 ( 9%) sys 0.13 ( 1%) wall
lexical analysis : 0.15 ( 2%) usr 0.07 (21%) sys 0.24 ( 2%) wall
parser : 0.64 ( 7%) usr 0.06 (18%) sys 0.90 ( 8%) wall
expand : 0.21 ( 2%) usr 0.00 ( 0%) sys 0.32 ( 3%) wall
varconst : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
integration : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 1%) wall
jump : 0.09 ( 1%) usr 0.01 ( 3%) sys 0.10 ( 1%) wall
CSE : 0.58 ( 6%) usr 0.01 ( 3%) sys 0.60 ( 5%) wall
global CSE : 1.54 (16%) usr 0.05 (15%) sys 2.14 (18%) wall
loop analysis : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
bypass jumps : 0.24 ( 2%) usr 0.01 ( 3%) sys 0.25 ( 2%) wall
CSE 2 : 0.20 ( 2%) usr 0.00 ( 0%) sys 0.20 ( 2%) wall
branch prediction : 0.11 ( 1%) usr 0.00 ( 0%) sys 0.11 ( 1%) wall
flow analysis : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
combiner : 0.24 ( 2%) usr 0.00 ( 0%) sys 0.24 ( 2%) wall
if-conversion : 0.07 ( 1%) usr 0.00 ( 0%) sys 0.22 ( 2%) wall
regmove : 0.06 ( 1%) usr 0.00 ( 0%) sys 0.06 ( 1%) wall
local alloc : 0.20 ( 2%) usr 0.00 ( 0%) sys 0.20 ( 2%) wall
global alloc : 1.35 (14%) usr 0.04 (12%) sys 1.70 (14%) wall
reload CSE regs : 0.83 ( 9%) usr 0.02 ( 6%) sys 0.92 ( 8%) wall
flow 2 : 0.06 ( 1%) usr 0.00 ( 0%) sys 0.12 ( 1%) wall
if-conversion 2 : 0.13 ( 1%) usr 0.00 ( 0%) sys 0.13 ( 1%) wall
peephole 2 : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.10 ( 1%) wall
rename registers : 0.23 ( 2%) usr 0.00 ( 0%) sys 0.26 ( 2%) wall
scheduling 2 : 0.55 ( 6%) usr 0.00 ( 0%) sys 0.58 ( 5%) wall
reorder blocks : 0.30 ( 3%) usr 0.01 ( 3%) sys 0.34 ( 3%) wall
shorten branches : 0.05 ( 1%) usr 0.00 ( 0%) sys 0.06 ( 1%) wall
final : 0.12 ( 1%) usr 0.00 ( 0%) sys 0.17 ( 1%) wall
rest of compilation : 0.16 ( 2%) usr 0.00 ( 0%) sys 0.17 ( 1%) wall
TOTAL : 9.66 0.34 11.80
Greetz
Steven