Comment 5 for bug 1270789

Created attachment 32017
pre processed source

This issue is originally reported in https://bugs.launchpad.net/gcc-linaro/+bug/1270789

The attached pre-processed source fails with:

# aarch64-linux-gnu-gcc -std=gnu99 -fgnu89-inline -O -Wall -Winline -Wwrite-strings -fmerge-all-constants -frounding-math -g -Wstrict-prototypes malloc.i
malloc.c: In function ‘__libc_mallopt’:
malloc.c:4761:16: error: invalid 'asm': invalid expression as operand

Splitting this inline asm out into a smaller testcase does not seem to reproduce the issue. It's possible this is a bug in the source file, but it's not clear from gcc's output what the problem is.

Seems to be an issue with alignment calculation in
aarch64_classify_address.

for rtl of the form (lo_sum:DI (reg/f:DI 132)
    (symbol_ref:DI ("*.LANCHOR4") [flags 0x182])) we are currently
calculating align of 8bits and due to this the following statement
returns false. This causes output_addr_const (in gcc/final.c) to fail.

 return ((INTVAL (offs) & (ref_size - 1)) == 0
                      && ((align / BITS_PER_UNIT) & (ref_size - 1)) == 0);

AFIK, align of 8bits is not correct here.

GCC version and config:
arm-none-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=/home/kugan/work/builds/gcc-fsf-trunk/tools/bin/arm-none-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/home/kugan/work/builds/gcc-fsf-trunk/tools/libexec/gcc/arm-none-linux-gnueabi/4.9.0/lto-wrapper
Target: arm-none-linux-gnueabi
Configured with: /home/kugan/work/sources/gcc-fsf/trunk/configure --target=arm-none-linux-gnueabi --prefix=/home/kugan/work/builds/gcc-fsf-trunk/tools --with-sysroot=/home/kugan/work/builds/gcc-fsf-trunk/sysroot-arm-none-linux-gnueabi --disable-libssp --disable-libgomp --disable-libmudflap --enable-languages=c,c++ --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=softfp --with-thumb
Thread model: posix
gcc version 4.9.0 20130922 (experimental) (GCC)