[PATCH, alpha]: Fix libgomp.fortran/threadprivate3.f90 ICE

[Uros Bizjak <ubizjak at gmail dot com>]

Hello!

libgomp.fortran/threadprivate3.f90 segfaults on gcc-4.3 branch in
alpha_expand_mov [1]. The problem is with force_const_mem that returns
NULL_RTX when targetm.cannot_force_const_mem triggers, due to:

/* Primarily this is required for TLS symbols, but given that our move
   patterns *ought* to be able to handle any symbol at any time, we
   should never be spilling symbolic operands to the constant pool, ever.  */

Attached patch returns failse in this case, so we expand default movdi
pattern then.

2009-02-26  Uros Bizjak  <ubizjak@gmail.com>

        * config/alpha.h (alpha_expand_mov): Return false if
        force_const_mem returns NULL_RTX.

Patch was bootstrapped and regression tested on alphaev56-unknown-linux-gnu.

I will commit this patch to mainline (the bug doesn't trigger there)
and gcc-4.3 branch shortly.

Uros.

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