From: Iain Buclaw <ibuclaw@gdcproject.org>
Date: Wed, 22 Jun 2022 17:11:20 +0000 (+0200)
Subject: tilegx: Fix infinite loop in gen-mul-tables generator
X-Git-Tag: releases/gcc-12.2.0~183
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=16d4ccc27d97b1b6623f1e41e07f916e353e8839;p=thirdparty%2Fgcc.git

tilegx: Fix infinite loop in gen-mul-tables generator

Since around GCC 10, the condition `j < (INTMAX_MAX / 10)' will get
optimized into `j != 922337203685477580', which will result in an
infinite loop for certain inputs of `j'.

Copy the condition already used by the -DTILEPRO generator code, which
doesn't fall into this trap.

gcc/ChangeLog:

	* config/tilepro/gen-mul-tables.cc (tilegx_emit): Adjust loop
	condition to avoid overflow.

(cherry picked from commit c0ad48527c314a1e9354b7c26718b56ed4abc92c)
---

diff --git a/gcc/config/tilepro/gen-mul-tables.cc b/gcc/config/tilepro/gen-mul-tables.cc
index c9649fb9c70e..ff7c3c905bc9 100644
--- a/gcc/config/tilepro/gen-mul-tables.cc
+++ b/gcc/config/tilepro/gen-mul-tables.cc
@@ -1190,11 +1190,11 @@ tilegx_emit (long long multiplier, int num_ops)
     long long next_pow10;
 
     while (((j * 10) < abs_multiplier)
-	   && (j < (INTMAX_MAX / 10)))
+	   && (j < (j * 10)))
       j = j * 10;
 
     prev_pow10 = j;
-    next_pow10 = (j > (INTMAX_MAX / 10)) ? 0 : j * 10;
+    next_pow10 = j * 10;
 
     if ((abs_multiplier - prev_pow10 <= 100)
 	|| (next_pow10