GCC ICE: internal compiler error: in push_minipool_fix

[Khem Raj]

GCC 4.6 is ICEing with the attached testcase. And this is not related to https://bugs.launchpad.net/gcc-linaro/+bug/711819
as the ICE happens after those patches applied.

The options needed are

-march=armv7-a -mfloat-abi=softfp -O2

my gcc is configures as below

./work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/bin/armv7a-angstrom-linux-gnueabi/arm-angstrom-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=./work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/bin/armv7a-angstrom-linux-gnueabi/arm-angstrom-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/libexec/armv7a-angstrom-linux-gnueabi/gcc/arm-angstrom-linux-gnueabi/4.6.0/lto-wrapper
Target: arm-angstrom-linux-gnueabi
Configured with: /home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/work/armv7a-angstrom-linux-gnueabi/gcc-cross-4.6-r0/gcc-4.6.0/configure --build=x86_64-linux --host=x86_64-linux --target=arm-angstrom-linux-gnueabi --prefix=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr --exec_prefix=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr --bindir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/bin/armv7a-angstrom-linux-gnueabi --sbindir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/bin/armv7a-angstrom-linux-gnueabi --libexecdir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/libexec/armv7a-angstrom-linux-gnueabi --datadir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/share --sysconfdir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/etc --sharedstatedir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/com --localstatedir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/var --libdir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/lib/armv7a-angstrom-linux-gnueabi --includedir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/include --oldincludedir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/include --infodir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/share/info --mandir=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr/share/man --disable-silent-rules --with-libtool-sysroot=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux --with-gnu-ld --enable-shared --enable-languages=c,c++ --enable-threads=posix --disable-multilib --enable-c99 --enable-long-long --enable-symvers=gnu --enable-libstdcxx-pch --program-prefix=arm-angstrom-linux-gnueabi- --enable-target-optspace --enable-lto --enable-libssp --disable-bootstrap --disable-libgomp --disable-libmudflap --enable-cheaders=c_global --with-float=soft --with-local-prefix=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/beagleboard/usr --with-gxx-include-dir=/usr/include/c++ --with-sysroot=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/beagleboard --with-build-sysroot=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/beagleboard --enable-poison-system-directories --disable-libunwind-exceptions --with-mpfr=/home/kraj/work/angstrom/build/tmp-angstrom_2010_x-eglibc/sysroots/x86_64-linux/usr --with-system-zlib --enable-nls --enable-__cxa_atexit --enable-__cxa_atexit
Thread model: posix
gcc version 4.6.0 (GCC)

[Michael Hope (michaelh1)]

Thank you for the bug report. I've confirmed this with gcc-linaro-4.6-2011.05-0 on ARM:

michaelh@ursa1:~/linaro/bugs$ /tools/toolchains/arch/armv7l/gcc-linaro-4.6-2011.05-0-armv7l-maverick-cbuild114-ursa3-cortexa9r1/bin/gcc -c -O2 -marm lp788841.i
svga_tgsi_insn.c: In function 'svga_shader_emit_instructions':
svga_tgsi_insn.c:2889:1: internal compiler error: in push_minipool_fix, at config/arm/arm.c:12138
...

michaelh@ursa1:~/linaro/bugs$ /tools/toolchains/gcc-4.6.0-armv7l-maverick-cbuild93-ursa1-cortexa8r1/bin/gcc -c -O2 -marm lp788841.i
svga_tgsi_insn.c: In function 'svga_shader_emit_instructions':
svga_tgsi_insn.c:2889:1: internal compiler error: in push_minipool_fix, at config/arm/arm.c:12084
...

The work-around is to compile at -O1. The fault also exists in gcc-4.6.0. It does not exist in linaro-gcc-4.5-2011.05, gcc-4.5.2, or gcc-trunk r174044. As this is a regression in 4.6 compared to 4.5, Could you please also report this in GCC bugzilla and attach it to this ticket?

I've set it to medium as it is a ftbfs, the fault exists upstream, and there is a work-around.

[Michael Hope (michaelh1)]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49135 may be related as it's on the same line, but note that the bug is against 4.7 not 4.6.

[Khem Raj (khem-raj)]

gcc.c-torture/execute/920302-1.c compiles fine with 4.6 and with the above option set.

[Michael Hope (michaelh1)]

(notes for michaelh) trunk r172224 and later don't show this problem where 4.6.0 does. 4.6 was branched at 170935.

...which is git range b4344328e74ba5bd83660a59a509b7a9aac0b7f6 to 9a4818f1445b5efcd959580be695bbbbdedeca03.

[Michael Hope (michaelh1)]

I did some bisecting and this problem is cleared by trunk r170984:

Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue Mar 15 11:09:09 2011 +0000

    2011-03-15 Richard Guenther <email address hidden>
        PR tree-optimization/41490

[Michael Collison (michael-collison)]

Will not fix for older releases. Issue fixed and does not impact linaro 4.8 or 4.9.

[Christophe Lyon (christophe-lyon)]

See bug #1296601 (duplicate of this one), in fact the problem is still present in 4.8/4.9 but difficult to reproduce.