On Thu, May 29, 2014 at 06:38:22PM +0100, Vladimir Makarov wrote:
> The following patch PR61325. The details can be found on
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61325
>
> The patch was bootstrapped and tested on x86/x86-64.
>
> Committed as rev. 211060 to gcc-4.9 branch and as rev.211061 to trunk.
>
> 2014-05-29 Vladimir Makarov <vmaka...@redhat.com>
>
> PR rtl-optimization/61325
> * lra-constraints.c (process_address): Rename to
> process_address_1.
> (process_address): New function.
>
> 2014-05-29 Vladimir Makarov <vmaka...@redhat.com>
>
> PR rtl-optimization/61325
> * gcc.target/aarch64/pr61325.c: New.
Hi Vlad,
This patch appears to cause issues where the ARM backend can get stuck in a
seemingly infinite loop.
Compiling:
./gcc.c-torture/compile/unalign-1.c
Directly With cc1 using command line:
cc1 gcc-clean/gcc/testsuite/gcc.c-torture/compile/unalign-1.c -O3
-mcpu=cortex-a15 -mthumb -mfloat-abi=hard -mfpu=neon-vfpv4
Triggers the issue reproducibly for me across a few ARM configurations.
Reverting this patch fixes the problem.
Interrupting and asking gdb for a backtrace gives this:
#1 0x005597cc in resize_reg_info() () at
/home/jamgre01//gcc-clean/gcc/reginfo.c:912
#2 0x004b436c in get_reg_class(int) () at
/home/jamgre01//gcc-clean/gcc/lra-int.h:400
#3 0x004b541c in in_class_p(rtx_def*, reg_class, reg_class*) () at
/home/jamgre01//gcc-clean/gcc/lra-constraints.c:265
#4 0x004b6314 in process_addr_reg(rtx_def**, rtx_def**, rtx_def**, reg_class)
() at /home/jamgre01//gcc-clean/gcc/lra-constraints.c:1176
#5 0x004b6aa0 in process_address_1(int, rtx_def**, rtx_def**) () at
/home/jamgre01//gcc-clean/gcc/lra-constraints.c:2829
#6 0x004bb150 in curr_insn_transform() () at
/home/jamgre01//gcc-clean/gcc/lra-constraints.c:3001
#7 0x004bd884 in lra_constraints(bool) () at
/home/jamgre01//gcc-clean/gcc/lra-constraints.c:4230
#8 0x004aca04 in lra(_IO_FILE*) () at /home/jamgre01//gcc-clean/gcc/lra.c:2333
For completeness, here is the -v output for one recent toolchain I've built.
Using built-in specs.
COLLECT_GCC=build/clean/install/bin/gcc
COLLECT_LTO_WRAPPER=/home/jamgre01/build/clean/install/bin/../libexec/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/lto-wrapper
Target: armv7l-unknown-linux-gnueabihf
Configured with: /home/jamgre01//gcc-clean/configure
--with-cpu=cortex-a15.cortex-a7 --with-fpu=neon-vfpv4 --with-float=hard
--prefix=/home/jamgre01/build//clean//install --enable-languages=c,c++,fortran
Thread model: posix
gcc version 4.10.0 20140603 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-O3' '-v' '-mcpu=cortex-a15.cortex-a7' '-mfloat-abi=hard'
'-mfpu=neon-vfpv4' '-mtls-dialect=gnu'
/home/jamgre01/build/clean/install/bin/../libexec/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/cc1
-quiet -v -imultilib . -imultiarch arm-linux-gnueabihf -iprefix
/home/jamgre01/build/clean/install/bin/../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/
gcc-clean/gcc/testsuite/gcc.c-torture/compile/unalign-1.c -quiet -dumpbase
unalign-1.c -mcpu=cortex-a15.cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4
-mtls-dialect=gnu -auxbase unalign-1 -O3 -version -o /tmp/ccZj6iwS.s
GNU C (GCC) version 4.10.0 20140603 (experimental)
(armv7l-unknown-linux-gnueabihf)
compiled by GNU C version 4.10.0 20140603 (experimental), GMP version
5.0.2, MPFR version 3.1.0-p3, MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
"/home/jamgre01/build/clean/install/bin/../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/../../../../armv7l-unknown-linux-gnueabihf/include"
ignoring duplicate directory
"/home/jamgre01/build/clean/install/bin/../lib/gcc/../../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/include"
ignoring nonexistent directory "/usr/local/include/arm-linux-gnueabihf"
ignoring duplicate directory
"/home/jamgre01/build/clean/install/bin/../lib/gcc/../../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/include-fixed"
ignoring nonexistent directory
"/home/jamgre01/build/clean/install/bin/../lib/gcc/../../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/../../../../armv7l-unknown-linux-gnueabihf/include"
#include "..." search starts here:
#include <...> search starts here:
/home/jamgre01/build/clean/install/bin/../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/include
/home/jamgre01/build/clean/install/bin/../lib/gcc/armv7l-unknown-linux-gnueabihf/4.10.0/include-fixed
/usr/local/include
/home/jamgre01/build/clean/install/bin/../lib/gcc/../../include
/usr/include/arm-linux-gnueabihf
/usr/include
End of search list.
GNU C (GCC) version 4.10.0 20140603 (experimental)
(armv7l-unknown-linux-gnueabihf)
compiled by GNU C version 4.10.0 20140603 (experimental), GMP version
5.0.2, MPFR version 3.1.0-p3, MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Thanks,
James
