[Bug target/63596] Saving of GPR/FPRs for stdarg even though the variable argument is not used

[jiwang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63596

--- Comment #5 from Jiong Wang <jiwang at gcc dot gnu.org> ---
Author: jiwang
Date: Fri May 27 13:05:34 2016
New Revision: 236819

URL: https://gcc.gnu.org/viewcvs?rev=236819&root=gcc&view=rev
Log:
[AArch64] PR target/63596, honor tree-stdarg analysis result to improve VAARG
codegen

gcc/
        PR target/63596
        * config/aarch64/aarch64.c (aarch64_expand_builtin_va_start): Honor
        tree-stdarg analysis results.
        (aarch64_setup_incoming_varargs): Likewise.

gcc/testsuite/
        * gcc.target/aarch64/va_arg_1.c: New testcase.
        * gcc.target/aarch64/va_arg_2.c: Likewise.
        * gcc.target/aarch64/va_arg_3.c: Likewise.


Added:
    trunk/gcc/testsuite/gcc.target/aarch64/va_arg_1.c
    trunk/gcc/testsuite/gcc.target/aarch64/va_arg_2.c
    trunk/gcc/testsuite/gcc.target/aarch64/va_arg_3.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/aarch64/aarch64.c
    trunk/gcc/testsuite/ChangeLog