SH: Fix PR 111001

gcc/ChangeLog:

	PR target/111001
	* config/sh/sh_treg_combine.cc (sh_treg_combine::record_set_of_reg):
	Skip over nop move insns.

diff --git a/gcc/config/sh/sh_treg_combine.cc b/gcc/config/sh/sh_treg_combine.cc
index fb109319938a07d2dd684145f80c657e92abf429..f1697f44e4b95956960c7539f478f571021af7ee 100644 (file)
--- a/gcc/config/sh/sh_treg_combine.cc
+++ b/gcc/config/sh/sh_treg_combine.cc
@@ -732,7 +732,14 @@ sh_treg_combine::record_set_of_reg (rtx reg, rtx_insn *start_insn,
        }
       else if (REG_P (new_entry.cstore.set_src ()))
        {
-         // If it's a reg-reg copy follow the copied reg.
+         // If it's a reg-reg copy follow the copied reg, but ignore
+         // nop copies of the reg onto itself.
+         if (REGNO (new_entry.cstore.set_src ()) == REGNO (reg))
+           {
+             i = prev_nonnote_nondebug_insn_bb (i);
+             continue;
+           }
+
          new_entry.cstore_reg_reg_copies.push_back (new_entry.cstore);
          reg = new_entry.cstore.set_src ();
          i = new_entry.cstore.insn;