From: Richard Biener <rguenther@suse.de>
Date: Wed, 10 Apr 2024 05:57:03 +0000 (+0200)
Subject: Revert "combine: Don't combine if I2 does not change"
X-Git-Tag: basepoints/gcc-15~254
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=109f1b28fc94c93096506e3df0c25e331cef19d0;p=thirdparty%2Fgcc.git

Revert "combine: Don't combine if I2 does not change"

This reverts commit 839bc42772ba7af66af3bd16efed4a69511312ae.
---

diff --git a/gcc/combine.cc b/gcc/combine.cc
index 71c9abc145c2..92b8d98e6c15 100644
--- a/gcc/combine.cc
+++ b/gcc/combine.cc
@@ -4196,17 +4196,6 @@ try_combine (rtx_insn *i3, rtx_insn *i2, rtx_insn *i1, rtx_insn *i0,
       adjust_for_new_dest (i3);
     }
 
-  /* If I2 didn't change, this is not a combination (but a simplification or
-     canonicalisation with context), which should not be done here.  Doing
-     it here explodes the algorithm.  Don't.  */
-  if (rtx_equal_p (newi2pat, PATTERN (i2)))
-    {
-      if (dump_file)
-	fprintf (dump_file, "i2 didn't change, not doing this\n");
-      undo_all ();
-      return 0;
-    }
-
   /* We now know that we can do this combination.  Merge the insns and
      update the status of registers and LOG_LINKS.  */