[Bug rtl-optimization/31143] New: bad argument passing on ARM

["kaminaga at sm dot sony dot co dot jp" <gcc-bugzilla at gcc dot gnu dot org>]

The attached code produces wrong-code on gcc-4.1.1 and gcc-4.1.2 on ARM. These
codes are snippet from linux kernel, and this was found when linux v2.6.19 was
built with gcc-4.1.1 with CONFIG_PRINK_TIME=y is set for ARM.

$ arm-linux-gcc -O2 -c div64.S
$ arm-linux-gcc -O2 -save-temps dodiv.c div64.o -o dodiv

actual result:
 $ ./dodiv
tbuf: <4>[   52.305419] 

expected result:
tbuf: <4>[    0.305419]

when compiled with -fno-tree-ter, the result was OK.

The problem comes from bad argument passing to sprintf(), looking from
dodiv.s:
...
        mov     r2, r5             <<<<<< (1)
        mov     ip, ip, lsr #6
        mov     r3, r5             <<<<<< (2)
        ldr     r1, .L10+8
        mov     r0, r4
        str     ip, [sp, #0]
        bl      sprintf

Where (1) is loglev_char argument and (2) is (unsigned long)t argument in
sprintf() in dodiv.c. Apparently, the loglev_char is also assigned to the first
%5lu part of sprintf, which is the cause.


-- 
           Summary: bad argument passing on ARM
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kaminaga at sm dot sony dot co dot jp
GCC target triplet: arm-*-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31143