[Bug target/78860] ICE in compilation for MIPS with -mpaired-single

[niva at niisi dot msk.ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78860

--- Comment #3 from niva at niisi dot msk.ru ---
In trunk, git://gcc.gnu.org/git/gcc.git, the problem
disappears after commit 76825907d9b0e20cbb572d0d70248a4ed332fb29 

But the changes in that commit are not applicable to gcc-4.7.4
which we are actually using.

In gcc-4.7.4 I've fixed the problem with the following patch:

diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index 1d72a05..e59d173 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -3030,3 +3030,7 @@ extern GTY(()) struct target_globals *mips16_globals;
    with arguments ARGS.  */
 #define PMODE_INSN(NAME, ARGS) \
   (Pmode == SImode ? NAME ## _si ARGS : NAME ## _di ARGS)
+
+/* This macro is introduced for fixing the gcc-4.7.4 #25 bug */
+#define TARGET_VECTOR_ADDRESSABLE 1
+
diff --git a/gcc/tree-ssa.c b/gcc/tree-ssa.c
index 08f908f..82b607f 100644
--- a/gcc/tree-ssa.c
+++ b/gcc/tree-ssa.c
@@ -1887,7 +1887,9 @@ maybe_optimize_var (tree var, bitmap addresses_taken,
bitmap not_reg_needs)
         a non-register.  Otherwise we are confused and forget to
         add virtual operands for it.  */
       && (!is_gimple_reg_type (TREE_TYPE (var))
+#ifndef TARGET_VECTOR_ADDRESSABLE
          || TREE_CODE (TREE_TYPE (var)) == VECTOR_TYPE
+#endif
          || TREE_CODE (TREE_TYPE (var)) == COMPLEX_TYPE
          || !bitmap_bit_p (not_reg_needs, DECL_UID (var))))
     {

I think this not a very accurate solution. However it seems to work.