From: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date: Wed, 28 Sep 2022 15:27:11 +0000 (+0200)
Subject: var-tracking: Add entry values up to max register mode
X-Git-Tag: basepoints/gcc-14~4290
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d7be27bf7ef63c770a591f69845c4245522cd76;p=thirdparty%2Fgcc.git

var-tracking: Add entry values up to max register mode

For parameter of type integer which do not consume a whole register
(modulo sign/zero extension) this patch adds entry values up to maximal
register mode.

gcc/ChangeLog:

	* var-tracking.cc (vt_add_function_parameter): Add entry values
	up to maximal register mode.
---

diff --git a/gcc/var-tracking.cc b/gcc/var-tracking.cc
index 235981d100f6..9c40ec4fb8b1 100644
--- a/gcc/var-tracking.cc
+++ b/gcc/var-tracking.cc
@@ -9906,6 +9906,23 @@ vt_add_function_parameter (tree parm)
 				     VAR_INIT_STATUS_INITIALIZED, NULL, INSERT);
 		}
 	    }
+
+	  if (GET_MODE_CLASS (mode) == MODE_INT)
+	    {
+	      machine_mode wider_mode_iter;
+	      FOR_EACH_WIDER_MODE (wider_mode_iter, mode)
+		{
+		  if (!HWI_COMPUTABLE_MODE_P (wider_mode_iter))
+		    break;
+		  rtx wider_reg
+		    = gen_rtx_REG (wider_mode_iter, REGNO (incoming));
+		  cselib_val *wider_val
+		    = cselib_lookup_from_insn (wider_reg, wider_mode_iter, 1,
+					       VOIDmode, get_insns ());
+		  preserve_value (wider_val);
+		  record_entry_value (wider_val, wider_reg);
+		}
+	    }
 	}
     }
   else if (GET_CODE (incoming) == PARALLEL && !dv_onepart_p (dv))