* sh.md (mulsi3): Tag an extra REG_EQUAL note to the middle insn.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26055 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 10 insertions, 1 deletions

diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md
index f572d6f343d..f5bd532f167 100644
--- a/gcc/config/sh/sh.md
+++ b/gcc/config/sh/sh.md
@@ -1112,8 +1112,17 @@
   else
     {
       rtx macl = gen_rtx_REG (SImode, MACL_REG);
+      rtx giv_insn;
+
       first = emit_insn (gen_mul_l (operands[1], operands[2]));
-      emit_insn (gen_movsi_i ((operands[0]), macl));
+      /* consec_sets_giv can only recognize the first insn that sets a
+	 giv as the giv insn.  So we must tag this also with a REG_EQUAL
+	 note.  */
+      giv_insn = emit_insn (gen_movsi_i ((operands[0]), macl));
+      REG_NOTES (giv_insn)
+	= gen_rtx_EXPR_LIST (REG_EQUAL,
+			     gen_rtx_MULT (SImode, operands[1], operands[2]),
+					   REG_NOTES (giv_insn));
       /* The sequence must end in a no-op move, lest cse puts macl in its
 	 tables and does invalid substitutions.  */
       last = emit_insn (gen_movsi_i ((operands[0]), operands[0]));