The following program should print 12345678. When it is built with "-O2 -m64"
or "-O3 -fno-inline -m64" on sparc, it instead prints 0.
I ran this test with the command "/opt/cfarm/release/4.4.0/bin/gcc -fno-inline
-O3 -m64 -g combined.c" on gcc62 in the GCC compile farm.
----------------------------------------------------------------------
"/opt/cfarm/release/4.4.0/bin/gcc -v" prints:
Using built-in specs.
Target: sparc64-unknown-linux-gnu
Configured with: ../gcc-4.4.0/configure
--enable-languages=c,c++,fortran,ada --prefix=/opt/cfarm/release/4.4.0
--enable-__cxa_atexit --enable-threads=posix --disable-nls
--with-mpfr=/opt/cfarm/mpfr-2.4.1 --with-gmp=/opt/cfarm/gmp-4.2.4 --with-cpu=v8
Thread model: posix
gcc version 4.4.0 (GCC)
----------------------------------------------------------------------
#include <stdint.h>
#include <stdio.h>
#include <string.h>
/* Stores 32-bit unsigned integer X at P,
which need not be aligned. */
static void
put_uint32 (uint32_t x, void *p)
{
memcpy (p, &x, sizeof x);
}
void
store_12345678 (int type, void *number)
{
switch (type)
{
case 1:
printf ("got here\n");
put_uint32 (0x12345678, number);
break;
case 7:
put_uint32 (0, number);
break;
case 8:
put_uint32 (0, number);
break;
case 9:
put_uint32 (0, number);
break;
}
}
int
main (void)
{
uint32_t x;
store_12345678 (1, &x);
printf ("%x\n", (unsigned int) x);
return 0;
}
--
Summary: 64-bit sparc miscompiles memcpy of argument inside
switch
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: blp at cs dot stanford dot edu
GCC build triplet: sparc64-unknown-linux-gnu
GCC host triplet: sparc64-unknown-linux-gnu
GCC target triplet: sparc64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40668
