--- Comment #1 from jde at google dot com 2006-02-16 02:26 ---
I was able to reproduce this bug. Indeed the offset is bytewise but the load is
done with a movl (movl foo+2, %eax) Below is the program used to reproduce,
the compiler and flags used, and the resultant output assembly.
Cheers
-Jeff
[calliope]% cat main.c
#include stdio.h
typedef enum { false, true } bool __attribute__((mode (byte)));
bool foo[16] = { 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0 } ;
long test (int i)
{
return foo[i];
}
int main(int argc, char*argv[])
{
printf (foo[2] (should be 1): %d\n, test(2));
printf (foo[5] (should be 0): %d\n, test(5));
}
[calliope]% i686-piii-linux-gnu-gcc-4.0.1 -O6 main.c -o main ; ./main
foo[2] (should be 1): 0
foo[5] (should be 0): 16777216
[calliope]% cat main.s
.file main.c
.globl foo
.data
.type foo, @object
.size foo, 16
foo:
.long 1
.long 0
.long 1
.long 0
.long 1
.long 0
.long 1
.long 0
.long 1
.long 0
.long 1
.long 0
.long 1
.long 0
.long 1
.long 0
.text
.p2align 4,,15
.globl test
.type test, @function
test:
pushl %ebp
movl%esp, %ebp
movl8(%ebp), %eax
popl%ebp
movlfoo(%eax), %eax
ret
.size test, .-test
.section.rodata.str1.1,aMS,@progbits,1
.LC0:
.string foo[2] (should be 1): %d\n
.LC1:
.string foo[5] (should be 0): %d\n
.text
.p2align 4,,15
.globl main
.type main, @function
main:
pushl %ebp
movl%esp, %ebp
subl$8, %esp
movlfoo+2, %eax
andl$-16, %esp
subl$16, %esp
movl$.LC0, (%esp)
movl%eax, 4(%esp)
callprintf
movlfoo+5, %eax
movl$.LC1, 8(%ebp)
movl%eax, 12(%ebp)
leave
jmp printf
.size main, .-main
.ident GCC: (GNU) 4.0.1
.section.note.GNU-stack,,@progbits
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21392
