I'm having trouble with an ICE, and I'm hoping somebody can enlighten me.
Given the following command:
cc1 -fpreprocessed ../pr34330.i -quiet -dumpbase pr34330.c -da -mb
-auxbase-strip pr34330.c -Os -version -ftree-parallelize-loops=4
-ftree-vectorize -o pr34330.s -fschedule-insns
I get an internal compiler error:
GNU C (GCC) version 4.5.0 20090702 (experimental) (sh-linux-gnu)
compiled by GNU C version 4.3.2, GMP version 4.3.1, MPFR
version 2.4.1-p5, MPC version 0.6
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU C (GCC) version 4.5.0 20090702 (experimental) (sh-linux-gnu)
compiled by GNU C version 4.3.2, GMP version 4.3.1, MPFR
version 2.4.1-p5, MPC version 0.6
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: c91a929a0209c0670a3ae8b8067b9f9a
/scratch/ams/4.4-sh-linux-gnu-lite/src/gcc-trunk-4.4/gcc/testsuite/gcc.dg/torture/pr34330.c:
In function 'foo':
/scratch/ams/4.4-sh-linux-gnu-lite/src/gcc-trunk-4.4/gcc/testsuite/gcc.dg/torture/pr34330.c:22:1:
error: insn does not satisfy its constraints:
(insn 171 170 172 4
/scratch/ams/4.4-sh-linux-gnu-lite/src/gcc-trunk-4.4/gcc/testsuite/gcc.dg/torture/pr34330.c:17
(set (reg:SI 9 r9)
(plus:SI (reg:SI 8 r8)
(reg:SI 0 r0 [orig:243 ivtmp.11 ] [243]))) 35
{*addsi3_compact} (nil))
/scratch/ams/4.4-sh-linux-gnu-lite/src/gcc-trunk-4.4/gcc/testsuite/gcc.dg/torture/pr34330.c:22:1:
internal compiler error: in reload_cse_simplify_operands, at
postreload.c:396
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
The problem is that r8 != r9 but SH requires that it is.
The problem insn is created by gen_reload when it is given the following
rtl as input:
(plus:SI (plus:SI (reg/v/f:SI 4 r4 [orig:192 a ] [192])
(const_int 2 [0x2]))
(reg:SI 0 r0 [orig:188 ivtmp.24 ] [188]))
The problem appears to be that the nested plus does not match any of the
patterns it recognizes so it falls through to the final else clause:
/* Otherwise, just write (set OUT IN) and hope for the best. */
else
emit_insn (gen_rtx_SET (VOIDmode, out, in));
... which doesn't even attempt to check the constraints.
Is this an unexpected corner case for reload? Or is the input RTL
mal-formed somehow?
This case fails in both GCC 4.4 and SVN trunk (although the latter has
disabled -fschedule-insns by default so it needs to be re-enabled
explicitly).
Thanks for an help.
Andrew
