[Bug target/66819] gcc.target/i386/pr65753.c fails with -fPIC -m32 -O2 -mregparm=3

[hjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66819

--- Comment #1 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Jul 10 20:30:10 2015
New Revision: 225688

URL: https://gcc.gnu.org/viewcvs?rev=225688&root=gcc&view=rev
Log:
Allow indirect sibcall with register arguments

Indirect sibcall with register arguments is OK when there is register
available for argument passing.

gcc/

        PR target/66819
        * config/i386/i386.c (ix86_function_ok_for_sibcall): Allow
        indirect sibcall with register arguments if register available
        for argument passing.
        (init_cumulative_args): Set cfun->machine->arg_reg_available
        to (cum->nregs > 0) or to true if function has a variable
        argument list.
        (function_arg_advance_32): Set cfun->machine->arg_reg_available
        to false if cum->nregs <= 0.
        * config/i386/i386.h (machine_function): Add arg_reg_available.

gcc/testsuite/

        PR target/66819
        * gcc.target/i386/pr66819-1.c: New test.
        * gcc.target/i386/pr66819-2.c: Likewise.
        * gcc.target/i386/pr66819-3.c: Likewise.
        * gcc.target/i386/pr66819-4.c: Likewise.
        * gcc.target/i386/pr66819-5.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr66819-1.c
    trunk/gcc/testsuite/gcc.target/i386/pr66819-2.c
    trunk/gcc/testsuite/gcc.target/i386/pr66819-3.c
    trunk/gcc/testsuite/gcc.target/i386/pr66819-4.c
    trunk/gcc/testsuite/gcc.target/i386/pr66819-5.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.h
    trunk/gcc/testsuite/ChangeLog