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[Bug rtl-optimization/52543] lower-subreg.c: code bloat of 300%-400% for bulti-word memory splits
- From: "gjl at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 09 Mar 2012 15:44:46 +0000
- Subject: [Bug rtl-optimization/52543] lower-subreg.c: code bloat of 300%-400% for bulti-word memory splits
- Auto-submitted: auto-generated
- References: <bug-52543-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52543
--- Comment #3 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-03-09 15:44:46 UTC ---
Created attachment 26864
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26864
lower.s: Assembler output with -fno-split-wide-types
Compiled with
avr-gcc lower.c -Os -S -dp -mmcu=atmega128 -fno-split-wide-types
The code size for this module is 38 bytes whereas with lobreg lowering the code
size is 142 bytes, which is a factor of 3.7