From: Richard Biener <rguenther@suse.de>
Date: Tue, 29 Nov 2022 08:03:46 +0000 (+0100)
Subject: tree-optimization/107898 - ICE with -Walloca-larger-than
X-Git-Tag: release-12.2.mpacbti-rel1~215
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a8af012222a8386fcda16a61dc17f11ba9cfbfd;p=thirdparty%2Fgcc.git

tree-optimization/107898 - ICE with -Walloca-larger-than

The following avoids ICEing with a mismatched prototype for alloca
and -Walloca-larger-than using irange for checks which doesn't
like mismatched types.

	PR tree-optimization/107898
	* gimple-ssa-warn-alloca.cc (alloca_call_type): Check
	the type of the alloca argument is compatible with size_t
	before querying ranges.

(cherry picked from commit 9948daa4fd0f0ea0a9d56c2fefe1bca478554d27)
---

diff --git a/gcc/gimple-ssa-warn-alloca.cc b/gcc/gimple-ssa-warn-alloca.cc
index 273b88ec141a..23f63f066f56 100644
--- a/gcc/gimple-ssa-warn-alloca.cc
+++ b/gcc/gimple-ssa-warn-alloca.cc
@@ -217,6 +217,7 @@ alloca_call_type (gimple *stmt, bool is_vla)
   int_range_max r;
   if (warn_limit_specified_p (is_vla)
       && TREE_CODE (len) == SSA_NAME
+      && types_compatible_p (TREE_TYPE (len), size_type_node)
       && get_range_query (cfun)->range_of_expr (r, len, stmt)
       && !r.varying_p ())
     {