https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70128
Marcin Juszkiewicz <mjuszkiewicz at redhat dot com> changed:
What |Removed |Added
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CC| |mjuszkiewicz at redhat dot com
--- Comment #9 from Marcin Juszkiewicz <mjuszkiewicz at redhat dot com> ---
Nicolas Pitre (author of kernel patch) wrote to me:
OK. I played with the reduced test case a bit. Here's an even smaller
test case you could add to the bug entry:
extern void bar(void);
void foo(void)
{
unsigned long fn_addr = ((unsigned long)&bar) & 3;
((unsigned int *)fn_addr)[0] = 5;
((unsigned int *)fn_addr)[1] = 6;
}
The generated assembly is:
ldr r3, .L2
mov r2, #6
and r3, r3, #3
str r2, [r3, #4]
bx lr
.L3:
.align 2
.L2:
.word bar
As you can see, the value 5 is dropped.
Let's hope gcc will be fixed.
