ICE building SPEC2006 403.gcc emit-rtl.c

[Kevin Jaget]

Also fails with -marm. I haven't tried removing the rest of the optimization options.

# arm-unknown-linux-gnueabi-gcc -c -o lin45BLD2011-05-0_cortex-a9_th2_neon_quad/emit-rtl.o -DSPEC_CPU -DNDEBUG -I. -march=armv7-a -mcpu=cortex-a9 -fno-common -mfpu=neon -mfloat-abi=softfp -O3 -g -mthumb -ffast-math -funsafe-loop-optimizations -mvectorize-with-neon-quad emit-rtl.c

emit-rtl.c: In function `init_emit_once':
emit-rtl.c:5168:1: error: insn does not satisfy its constraints:
(insn 2098 503 2097 31 emit-rtl.c:5049 (set (mem/s/c:EI (post_inc:SI (reg:SI 3 r3)) [46 dconst0+0 S24 A64])
        (reg:EI 103 d20)) 785 {*neon_movei} (expr_list:REG_INC (reg:SI 3 r3)
        (nil)))
emit-rtl.c:5168:1: internal compiler error: in reload_cse_simplify_operands, at postreload.c:402

# arm-unknown-linux-gnueabi-gcc.exe -v
Using built-in specs.
COLLECT_GCC=/usr/local/linaro-gcc/bin/arm-unknown-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/usr/local/linaro-gcc/libexec/gcc/arm-unknown-linux-gnueabi/4.5.4/lto-wrapper.exe
Target: arm-unknown-linux-gnueabi
Configured with: ../configure --enable-languages=c,c++,fortran --target=arm-unknown-linux-gnueabi --prefix=/usr/local/linaro-gcc --with-sysroot=/usr/local/linaro-gcc/sysroot --with-cloog=/usr/local --with-ppl=/usr/local --enable-lto --with-arch=armv7-a --with-float=softfp --with-fpu=neon
Thread model: posix
gcc version 4.5.4 20110505 (prerelease) (Linaro GCC 4.5-2011.05-0)

Hopefully you have access to SPEC2006 source - I'm not sure if I can redistribute it even in preprocessed form.

[Michael Hope (michaelh1)]

Thank you for the bug report. I've confirmed this with gcc-linaro-4.5-2011.06-0 on ARM:

michaelh@ursa2:~/linaro/bugs$ /tools/toolchains/arch/armv7l/gcc-linaro-4.5-2011.06-0-armv7l-maverick-cbuild130-ursa4-cortexa9r1/bin/gcc -S -mfpu=neon -fno-common -O3 emit-rtl.i
emit-rtl.c: In function 'init_emit_once':
emit-rtl.c:5168:1: error: insn does not satisfy its constraints:
(insn 1906 458 1905 31 emit-rtl.c:5049 (set (mem/s/c:EI (post_inc:SI (reg:SI 3 r3)) [46 dconst0+0 S24 A64])
        (reg:EI 103 d20)) 785 {*neon_movei} (expr_list:REG_INC (reg:SI 3 r3)
        (nil)))
emit-rtl.c:5168:1: internal compiler error: in reload_cse_simplify_operands, at postreload.c:402

The work around is to remove -fno-common. The fault also exists in gcc-linaro-4.6-2011.06-0. It does not exist in gcc-linaro-4.5-2011.04, gcc-4.5.3, gcc-4.6.0, or recent gcc trunk r174795.

I've set this to medium priority as it is a ftbfs, occurs at high optimisation levels, and a work-around exists.

That's an impressive set of optimisation flags by the way...

[Michael Hope (michaelh1)]

Attached the preprocessed source. The failing code is from GCC which is licensed under the GPL and trumps any restrictions in the benchmark license.

[Michael Hope (michaelh1)]

Checking past builds shows that this was exposed in r99503. Richard, could you have a look?

[Ramana Radhakrishnan (ramana)]

I suspect this is a dup of the other bug LP:744754 .

Should be fixed soonish if the tests for https://code.launchpad.net/~ramana/gcc-linaro/fix-lp-744754-46/+merge/66263 pass

Ramana

[Michael Hope (michaelh1)]

Ramana's branch clears the problem.

[Michael Hope (michaelh1)]

Make that branches.