[Bug target/60028] TIC6X: B3 register (return address) is saved on stack when real call is replaced with sibling call in a leaf function

[Bug target/60028] TIC6X: B3 register (return address) is saved on stack when real call is replaced with sibling call in a leaf function

[wojtek.golf at interia dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60028

Wojciech Migda <wojtek.golf at interia dot pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |tic6x-none-elf
               Host|                            |Linux wmigda-desktop
                   |                            |3.11.0-13-generic
                   |                            |#20-Ubuntu SMP Wed Oct 23
                   |                            |17:26:33 UTC 2013 i686 i686
                   |                            |i686 GNU/Linux
            Version|4.8.2                       |4.9.0
              Build|                            |tic6x-none-elf-gcc (GCC)
                   |                            |4.9.0 20140208
                   |                            |(experimental)

--- Comment #1 from Wojciech Migda <wojtek.golf at interia dot pl> ---
I have recreated the scenario on the latest 4.9.0 shanpshot, hence the changes
in the headline/description.

=================================================================================
Exact version of gcc:
tic6x-none-elf-gcc (GCC) 4.9.0 20140208 (experimental)

================================================================================
System type:
Linux wmigda-desktop 3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 17:26:33 UTC
2013 i686 i686 i686 GNU/Linux

================================================================================
Options given when gcc was built:

export TRIPLET=tic6x-none-elf
mkdir -pv ${X_BUILD_DIR}/gcc-${GCC_VER}-build-pass-1/

pushd ${X_BUILD_DIR}gcc-${GCC_VER}-build-pass-1/ && \
RANLIB_FOR_TARGET=${CXTOOLS}bin/${TRIPLET}-ranlib
AS_FOR_TARGET=${CXTOOLS}bin/${TRIPLET}-as
AR_FOR_TARGET=${CXTOOLS}bin/${TRIPLET}-ar \
AS=as AR=ar LDFLAGS='-lstdc++ -lm' ../../../../gcc/configure \
--prefix=${C_TOOLS} \
--build=$(gcc -dumpmachine) \
--host=$(gcc -dumpmachine) \
--target=${TRIPLET} \
--with-local-prefix=${CXTOOLS}${TRIPLET}/sysroot \
--with-sysroot=${CXTOOLS}${TRIPLET}/sysroot \
--disable-nls \
--disable-shared \
--without-headers \
--with-newlib \
--disable-decimal-float \
--disable-libgomp \
--disable-libmudflap \
--disable-libssp \
--disable-libatomic \
--disable-libquadmath \
--disable-threads \
--enable-languages=c \
--disable-multilib \
--with-mpfr=${C_TOOLS} \
--with-gmp=${C_TOOLS} \
--disable-__cxa_atexit \
--disable-sjlj-exceptions \
--enable-target-optspace \
--disable-libstdcxx-pch \
; popd

================================================================================
Commandline:
tic6x-none-elf-gcc -fleading-underscore -march=c674x -O2 -g0 -S main.c

================================================================================
Compiler output:
nothing one the console

================================================================================
Preprocessed file:

# 1 "main.c"
# 1 "<command-line>"
# 1 "main.c"
int e_fun(int arg);
extern int e_int;

void g_fun(void)
{
    e_fun(e_int);
}

================================================================================