[Bug optimization/12395] Suboptimal code with global variables

[steven at gcc dot gnu dot org]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12395



------- Additional Comments From steven at gcc dot gnu dot org  2003-09-25 19:38 -------
Well I don't _know_ for sure if it is related to global variabes, but it sure
seems so:

void foo(int a) {
  if(++a) ++a;
  printf ("%d",a);
}



        .file   "t.c"
        .section        .rodata.str1.1,"aMS",@progbits,1
.LC0:
        .string "%d"
        .text
.globl foo
        .type   foo,@function
foo:
        movl    4(%esp), %eax
        incl    %eax
        je      .L2
        incl    %eax
.L2:
        pushl   %eax
        pushl   $.LC0
        call    printf
        popl    %eax
        popl    %edx
        ret
.Lfe1:
        .size   foo,.Lfe1-foo
        .ident  "GCC: (GNU) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)"


void foo() {
  int a
  if(++a) ++a;
  printf ("%d",a);
}

produces something similar.