From: Richard Biener <rguenther@suse.de>
Date: Thu, 5 Oct 2023 08:26:34 +0000 (+0200)
Subject: Fix SIMD call SLP discovery
X-Git-Tag: basepoints/gcc-15~5733
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6dc44436301143a286e3b45de0673af012299eba;p=thirdparty%2Fgcc.git

Fix SIMD call SLP discovery

When we do SLP discovery of SIMD calls we run into the issue that
when the call is neither builtin nor internal function we have
cfn == CFN_LAST but internal_fn_p of that returns true.  Since
IFN_LAST isn't vectorizable we fail spuriously.

Fixed by checking for cfn != CFN_LAST && internal_fn_p (cfn)
instead.

	* tree-vect-slp.cc (vect_build_slp_tree_1): Do not
	ask for internal_fn_p (CFN_LAST).
---

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index a3e54ebf62a2..fa098f9ff4ea 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -1084,7 +1084,8 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap,
 	      ldst_p = true;
 	      rhs_code = CFN_MASK_STORE;
 	    }
-	  else if ((internal_fn_p (cfn)
+	  else if ((cfn != CFN_LAST
+		    && internal_fn_p (cfn)
 		    && !vectorizable_internal_fn_p (as_internal_fn (cfn)))
 		   || gimple_call_tail_p (call_stmt)
 		   || gimple_call_noreturn_p (call_stmt)