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[SH] ICE compiling pr34330 testcase for sh-linux-gnu


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


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