re PR target/66033 (rs6000 nops removed by rtl_dce)

	PR target/66033
	* config/rs6000/rs6000.md (nop): Use an unspec pattern.
	(UNSPEC_NOP): Define.
	(reload_vsx_from_gpr<mode>): Add missing DONE.
	(reload_gpr_from_vsx<mode>): Likewise.
	* config/rs6000/vsx.md (vsx_mul_v2di): Likewise.
	(vsx_div_v2di, vsx_udiv_v2di): Likewise.

From-SVN: r222851

gcc/ChangeLog

+2015-05-06  Alan Modra  <amodra@gmail.com>
+
+	PR target/66033
+	* config/rs6000/rs6000.md (nop): Use an unspec pattern.
+	(UNSPEC_NOP): Define.
+	(reload_vsx_from_gpr<mode>): Add missing DONE.
+	(reload_gpr_from_vsx<mode>): Likewise.
+	* config/rs6000/vsx.md (vsx_mul_v2di): Likewise.
+	(vsx_div_v2di, vsx_udiv_v2di): Likewise.
+
 2015-05-06  Christian Bruel  <christian.bruel@st.com>
 
 	PR target/66015

gcc/config/rs6000/rs6000.md

@@ -121,6 +121,7 @@
    UNSPEC_LFIWAX
    UNSPEC_LFIWZX
    UNSPEC_FCTIWUZ
+   UNSPEC_NOP
    UNSPEC_GRP_END_NOP
    UNSPEC_P8V_FMRGOW
    UNSPEC_P8V_MTVSRWZ
@@ -8796,6 +8797,7 @@
   emit_insn (gen_p8_mtvsrd_1 (tmp, gpr_hi_reg));
   emit_insn (gen_p8_mtvsrd_2 (tmp, gpr_lo_reg));
   emit_insn (gen_p8_xxpermdi_<mode> (dest, tmp));
+  DONE;
 }
   [(set_attr "length" "12")
    (set_attr "type" "three")])
@@ -8872,6 +8874,7 @@
   emit_insn (gen_p8_mfvsrd_3_<mode> (gpr_hi_reg, src));
   emit_insn (gen_vsx_xxpermdi_<mode> (tmp, src, src, GEN_INT (3)));
   emit_insn (gen_p8_mfvsrd_3_<mode> (gpr_lo_reg, tmp));
+  DONE;
 }
   [(set_attr "length" "12")
    (set_attr "type" "three")])
@@ -12888,7 +12891,7 @@
   [(set_attr "type" "jmpreg")])
 
 (define_insn "nop"
-  [(const_int 0)]
+  [(unspec [(const_int 0)] UNSPEC_NOP)]
   ""
   "nop")
 

gcc/config/rs6000/vsx.md

@@ -780,6 +780,7 @@
   emit_insn (gen_vsx_extract_v2di (op4, op2, GEN_INT (1)));
   emit_insn (gen_muldi3 (op3, op3, op4));
   emit_insn (gen_vsx_concat_v2di (op0, op5, op3));
+  DONE;
 }"
   [(set_attr "type" "mul")])
 
@@ -817,6 +818,7 @@
   emit_insn (gen_vsx_extract_v2di (op4, op2, GEN_INT (1)));
   emit_insn (gen_divdi3 (op3, op3, op4));
   emit_insn (gen_vsx_concat_v2di (op0, op5, op3));
+  DONE;
 }"
   [(set_attr "type" "div")])
 
@@ -844,6 +846,7 @@
   emit_insn (gen_vsx_extract_v2di (op4, op2, GEN_INT (1)));
   emit_insn (gen_udivdi3 (op3, op3, op4));
   emit_insn (gen_vsx_concat_v2di (op0, op5, op3));
+  DONE;
 }"
   [(set_attr "type" "div")])