[committed] amdgcn: Fix vector min/max ICE (pr112313)

[Andrew Stubbs]

I've just committed this patch to fix pr112313 (oops, I forgot to write 
the number in the commit message).

The problem was a missed case in the vector reduction expand code.
Andrewamdgcn: Fix vector min/max ICE

The DImode min/max instructions need a clobber that SImode does not, so
add the special case to the reduction expand code.

gcc/ChangeLog:

        * config/gcn/gcn.cc (gcn_expand_reduc_scalar): Add clobber to DImode
        min/max instructions.

diff --git a/gcc/config/gcn/gcn.cc b/gcc/config/gcn/gcn.cc
index 6a2aaefceca..ac299259213 100644
--- a/gcc/config/gcn/gcn.cc
+++ b/gcc/config/gcn/gcn.cc
@@ -5514,7 +5514,15 @@ gcn_expand_reduc_scalar (machine_mode mode, rtx src, int 
unspec)
        {
          rtx tmp = gen_reg_rtx (mode);
          emit_insn (gen_dpp_move (mode, tmp, in, shift_val));
-         emit_insn (gen_rtx_SET (out, gen_rtx_fmt_ee (code, mode, tmp, in)));
+         rtx insn = gen_rtx_SET (out, gen_rtx_fmt_ee (code, mode, tmp, in));
+         if (scalar_mode == DImode)
+           {
+             rtx clobber = gen_rtx_CLOBBER (VOIDmode,
+                                            gen_rtx_REG (DImode, VCC_REG));
+             insn = gen_rtx_PARALLEL (VOIDmode,
+                                      gen_rtvec (2, insn, clobber));
+           }
+         emit_insn (insn);
        }
       else
        {