[Bug rtl-optimization/64037] [4.8/4.9/5 Regression] Miscompilation with -Os and enum class : char parameter

[hjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64037

--- Comment #28 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Dec 19 19:19:33 2014
New Revision: 218967

URL: https://gcc.gnu.org/viewcvs?rev=218967&root=gcc&view=rev
Log:
Pass unpromoted argument to promote_function_mode

This patch updates setup_incoming_promotions in combine.c to match what
is actually passed in assign_parm_setup_reg in function.c.

Backported from mainline:

gcc/

    PR rtl-optimization/64037
    * combine.c (setup_incoming_promotions): Pass the argument
    before any promotions happen to promote_function_mode.

gcc/testsuite/

    PR rtl-optimization/64037
    * g++.dg/pr64037.C: New test.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/g++.dg/pr64037.C
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/combine.c
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog