From: David Malcolm <dmalcolm@redhat.com>
Date: Wed, 29 Mar 2023 18:16:47 +0000 (-0400)
Subject: analyzer: fold -(-(VAL)) to VAL
X-Git-Tag: releases/gcc-12.3.0~160
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b414c17e072c1e0ef1bfcfbde2bea310e5f87dd8;p=thirdparty%2Fgcc.git

analyzer: fold -(-(VAL)) to VAL

Cherrypicked from r13-3075-g7f42f7adfa69fe.

gcc/analyzer/ChangeLog:
	* region-model-manager.cc
	(region_model_manager::maybe_fold_unaryop): Fold -(-(VAL)) to VAL.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
---

diff --git a/gcc/analyzer/region-model-manager.cc b/gcc/analyzer/region-model-manager.cc
index 6d248c98fcfc..a5977c1d6b49 100644
--- a/gcc/analyzer/region-model-manager.cc
+++ b/gcc/analyzer/region-model-manager.cc
@@ -430,6 +430,17 @@ region_model_manager::maybe_fold_unaryop (tree type, enum tree_code op,
 	    }
       }
       break;
+    case NEGATE_EXPR:
+      {
+	/* -(-(VAL)) is VAL, for integer types.  */
+	if (const unaryop_svalue *unaryop = arg->dyn_cast_unaryop_svalue ())
+	  if (unaryop->get_op () == NEGATE_EXPR
+	      && type == unaryop->get_type ()
+	      && type
+	      && INTEGRAL_TYPE_P (type))
+	    return unaryop->get_arg ();
+      }
+      break;
     }
 
   /* Constants.  */