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[SH,committed] Fix PR 111001

Message ID a684f28033020f45021de3ef40a1599e78fececf.camel@t-online.de
State New
Headers show
Series [SH,committed] Fix PR 111001 | expand

Commit Message

Oleg Endo Oct. 23, 2023, 1:28 p.m. UTC 
The attached patch fixes PR 111001.

Committed to master, cherry-picked to GCC-13, GCC-12 and GCC-11.
Sanity tested with 'make all-gcc'.
Bootstrapped on GCC-13 sh4-linux by Adrian.

Cheers,
Oleg

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

From 4414818f4e5de54ea3c353e2ebb2e79a89ae211b Mon Sep 17 00:00:00 2001
From: Oleg Endo <olegendo@gcc.gnu.org>
Date: Mon, 23 Oct 2023 22:08:37 +0900
Subject: [PATCH] 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.
---
 gcc/config/sh/sh_treg_combine.cc |  9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/gcc/config/sh/sh_treg_combine.cc b/gcc/config/sh/sh_treg_combine.cc
index f6553c0..685ca54 100644
--- a/gcc/config/sh/sh_treg_combine.cc
+++ b/gcc/config/sh/sh_treg_combine.cc
@@ -731,9 +731,16 @@  sh_treg_combine::record_set_of_reg (rtx reg, rtx_insn *start_insn,
 	  new_entry.cstore_type = cstore_inverted;
 	}
       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;
 
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