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Old 10-21-2011, 07:34 PM
Konstantinos Margaritis
Default Bug#646163: gcc-4.6: another ICE when building neon code

Package: gcc-4.6
Version: 4.6.1-15
Severity: normal

(Note: this is a different ICE than #646160, but produced from the
same file as the previous, in fact it's produced from the same
function, albeit with a small modification).
When building neon code on armhf -which I cannot attach to its full,
due to licensing reason, unfortunately- I get an ICE. Using delta I
was able to get a minimal testcase (which is different than the one in
#646160), that produces the exact ICE. The testcase is attached. Here
is the message and the cmd line used:

$ gcc -O -mfpu=neon matrix2-min.i
matrix2-min.i: In function ‘matrixTranspose’:
matrix2-min.i:38:5: error: insn does not satisfy its constraints:
(insn 41 16 17 2 (set (mem/c/i:XI (pre_dec:SI (reg/f:SI 5 r5 [145]))
[0 S64 A64])
(reg:XI 111 d24)) matrix2-min.i:21 753 {*neon_movxi}
(expr_list:REG_INC (reg/f:SI 5 r5 [145])
matrix2-min.i:38:5: internal compiler error: in
reload_cse_simplify_operands, at postreload.c:403
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccpGsI3S.out file, please attach
this to your bugreport.

This ICE is not reproducible on gcc-4.6 on oneiric/armel.


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