From: Oleg Endo <olegendo@gcc.gnu.org>
Date: Mon, 23 Oct 2023 13:08:37 +0000 (+0900)
Subject: SH: Fix PR 111001
X-Git-Tag: basepoints/gcc-15~5277
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=267e369afbb963d8d84d7a9f0cb9fb18672d99a8;p=thirdparty%2Fgcc.git

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 9f6a89fa71fb..9b35960c8c2b 100644
--- a/gcc/config/sh/sh_treg_combine.cc
+++ b/gcc/config/sh/sh_treg_combine.cc
@@ -729,7 +729,14 @@ 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;