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[Bug optimization/13329] [3.4 Regression] -fcrossjumping (implied by -O1) pessimizes code
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Dec 2003 10:01:24 -0000
- Subject: [Bug optimization/13329] [3.4 Regression] -fcrossjumping (implied by -O1) pessimizes code
- References: <20031206025954.13329.coyote@coyotegulch.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From steven at gcc dot gnu dot org 2003-12-23 10:01 -------
Hmmm....?
-lrt -O -fno-crossjumping
huffbench (Std. C) run time: 71.434313
huffbench (Std. C) run time: 71.532428
huffbench (Std. C) run time: 71.555546
-lrt -O
huffbench (Std. C) run time: 71.401371
huffbench (Std. C) run time: 71.479552
huffbench (Std. C) run time: 71.412187
-lrt -O2 -fno-crossjumping
huffbench (Std. C) run time: 63.930330
huffbench (Std. C) run time: 63.920214
huffbench (Std. C) run time: 63.741271
-lrt -O2
huffbench (Std. C) run time: 61.653031
huffbench (Std. C) run time: 61.559256
huffbench (Std. C) run time: 61.616904
GNU C version 3.4.0 20031223 (experimental) (i686-pc-linux-gnu)
compiled by GNU C version 3.4.0 20031223 (experimental).
GGC heuristics: --param ggc-min-expand=56 --param ggc-min-heapsize=50000
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13329