From: Jan Hubicka <jh@suse.cz>
Date: Tue, 27 Oct 2020 08:03:45 +0000 (+0100)
Subject: Use EAF_RETURN_ARG in tree-ssa-ccp.c
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7f227da3e603cffe7659d404f094e07507a993b1;p=gcc.git

Use EAF_RETURN_ARG in tree-ssa-ccp.c

	* tree-ssa-ccp.c (evaluate_stmt): Use EAF_RETURN_ARG; do not handle
	string buitings specially.
---

diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c
index 0432fe5513d..ef44e66ce8b 100644
--- a/gcc/tree-ssa-ccp.c
+++ b/gcc/tree-ssa-ccp.c
@@ -1796,6 +1796,7 @@ evaluate_stmt (gimple *stmt)
   ccp_lattice_t likelyvalue = likely_value (stmt);
   bool is_constant = false;
   unsigned int align;
+  bool ignore_return_flags = false;
 
   if (dump_file && (dump_flags & TDF_DETAILS))
     {
@@ -1965,22 +1966,9 @@ evaluate_stmt (gimple *stmt)
 	      val.mask = ~((HOST_WIDE_INT) align / BITS_PER_UNIT - 1);
 	      break;
 
-	    /* These builtins return their first argument, unmodified.  */
-	    case BUILT_IN_MEMCPY:
-	    case BUILT_IN_MEMMOVE:
-	    case BUILT_IN_MEMSET:
-	    case BUILT_IN_STRCPY:
-	    case BUILT_IN_STRNCPY:
-	    case BUILT_IN_MEMCPY_CHK:
-	    case BUILT_IN_MEMMOVE_CHK:
-	    case BUILT_IN_MEMSET_CHK:
-	    case BUILT_IN_STRCPY_CHK:
-	    case BUILT_IN_STRNCPY_CHK:
-	      val = get_value_for_expr (gimple_call_arg (stmt, 0), true);
-	      break;
-
 	    case BUILT_IN_ASSUME_ALIGNED:
 	      val = bit_value_assume_aligned (stmt, NULL_TREE, val, false);
+	      ignore_return_flags = true;
 	      break;
 
 	    case BUILT_IN_ALIGNED_ALLOC:
@@ -2049,6 +2037,15 @@ evaluate_stmt (gimple *stmt)
 	      if (attrs)
 		val = bit_value_assume_aligned (stmt, attrs, val, true);
 	    }
+	  int flags = ignore_return_flags
+		      ? 0 : gimple_call_return_flags (as_a <gcall *> (stmt));
+	  if (flags & ERF_RETURNS_ARG
+	      && (flags & ERF_RETURN_ARG_MASK) < gimple_call_num_args (stmt))
+	    {
+	      val = get_value_for_expr
+			 (gimple_call_arg (stmt,
+					   flags & ERF_RETURN_ARG_MASK), true);
+	    }
 	}
       is_constant = (val.lattice_val == CONSTANT);
     }