From: Aldy Hernandez <aldyh@redhat.com>
Date: Thu, 8 Oct 2020 09:41:00 +0000 (+0200)
Subject: Fix PR97325.
X-Git-Tag: basepoints/gcc-12~4538
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9489806fa258b90b02b55804e61e9eb748724ce7;p=thirdparty%2Fgcc.git

Fix PR97325.

gcc/ChangeLog:

	PR tree-optimization/97325
	* gimple-range.cc (gimple_ranger::range_of_builtin_call): Handle
	negative numbers in __builtin_ffs and __builtin_popcount.
---

diff --git a/gcc/gimple-range.cc b/gcc/gimple-range.cc
index 75c03d6610b7..2461bb78394c 100644
--- a/gcc/gimple-range.cc
+++ b/gcc/gimple-range.cc
@@ -620,6 +620,8 @@ gimple_ranger::range_of_builtin_call (irange &r, gcall *call)
       // If some high bits are known to be zero, decrease the maximum.
       if (!r.undefined_p ())
 	{
+	  if (TYPE_SIGN (r.type ()) == SIGNED)
+	    range_cast (r, unsigned_type_for (r.type ()));
 	  wide_int max = r.upper_bound ();
 	  maxi = wi::floor_log2 (max) + 1;
 	}