[Bug optimization/11180] New: [avr-gcc] Optimization decrease performance of struct assignment.

["pinskia at physics dot uc dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11180

           Summary: [avr-gcc] Optimization decrease performance of struct
                    assignment.
           Product: gcc
           Version: 3.3.1
            Status: NEW
          Severity: minor
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dmixm at marine dot febras dot ru
                CC: gcc-bugs at gcc dot gnu dot org

Any optimization level increase size and decrease speed 
for next program: 
 
	typedef struct { long lo; int in; } lo_in; 
	lo_in foo (void) 
	{ 
	    lo_in x; 
	    x.lo = 1; 
	    x.in = 2; 
	    return x; 
	} 
 
"avr-gcc -W -Wall -S -O0" produced: 
	/* File "lo_in.c": code   75 = 0x004b (  40), prologues  18, epilogues  17 */ 
"avr-gcc -W -Wall -S -Os" produced: 
	/* File "lo_in.c": code   80 = 0x0050 (  29), prologues  26, epilogues  25 */ 
"avr-gcc -W -Wall -S -O3" produced: 
	/* File "lo_in.c": code   79 = 0x004f (  28), prologues  26, epilogues  25 */ 
 
Compiler: 
	avr-gcc (GCC) 3.3.1 20030519 (prerelease)
------- Additional Comments From pinskia at physics dot uc dot edu  2003-07-06 01:24 -------
I can confirm this on the mainline (20030706).