[Bug c/17306] New: function_vector attribute in H8300H/H8S

["asgarij at kpitcummins dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,

As per the document at 
http://gcc.gnu.org/onlinedocs/gcc-3.4.1/gcc/Function-Attributes.html#Function%
20Attributes 
callling a function with function_vector attribute for H8300H, 
H8S targets should use lesser number of bytes than normal call. That means it
should be using memory indirect call using jsr @@aa:8 instruction. But 
following test 
case doesn't generate such instruction.

Commandline: h8300-elf-gcc test.c -mh -S

/* test.c */
void foo (void) __attribute__ ((function_vector));
void foo (void)
{
}

void bar (void)
{
    foo();
}

Folowing is assembly listing.

    .h8300h
    .section .text
    .align 1
    .global _foo
_foo:
    mov.l   er6,@-er7
    mov.l   er7,er6
    mov.l   @er7+,er6
    rts
    .size   _foo, .-_foo
    .align 1
    .global _bar
_bar:
    mov.l   er6,@-er7
    mov.l   er7,er6
    jsr @_foo ----> should be jsr @@aa:8
    mov.l   @er7+,er6
    rts
    .size   _bar, .-_bar
    .end

Regards,
Asgari Jinia
KPIT Cummins InfoSystems Ltd.
Pune, India

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-- 
           Summary: function_vector attribute in H8300H/H8S
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: asgarij at kpitcummins dot com
                CC: asgarij at kpitcummins dot com,gcc-bugs at gcc dot gnu
                    dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: h8300-unknown-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17306