optimization/10157: internal compiler error: in extract_insn, at recog.c:2188

[Peter van Hoof]

The following reply was made to PR optimization/10157; it has been noted by GNATS.

From: Peter van Hoof <p.van-hoof@qub.ac.uk>
To: p.van-hoof@qub.ac.uk, gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, 
    nobody@gcc.gnu.org
Cc:  
Subject: Re: optimization/10157: internal compiler error: in extract_insn, at
         recog.c:2188
Date: Thu, 20 Mar 2003 02:53:09 +0000

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10157
 
 This somewhat shorter version triggers the bug with -O2 instead of -O3:
 
 void g() {
 	while( 1 ) {
 		int i,n;
 		double p,r;
 		for( i=0; i < n; i++ )
 			if( p > 1. )
 				for( i=0; i < n; i++ )
 					r += 2.;
 	}
 }
 
 scooby>	gcc -c -O2 -ffast-math h3.c
 h3.c: In function `g':
 h3.c:10: error: unrecognizable insn:
 (insn:HI 130 129 8 0 0 (set (reg:CCFPE 127)
          (compare:CCFPE (reg/v:DF 109 [ p ])
              (reg:DF 111))) -1 (insn_list 129 (nil))
      (expr_list:REG_DEAD (reg/v:DF 109 [ p ])
          (expr_list:REG_DEAD (reg:DF 111)
              (expr_list:REG_EQUAL (compare:CCFPE (reg/v:DF 109 [ p ])
                      (const_double:DF 1.0e+0 [0x0.8p+1]))
                  (nil)))))
 h3.c:10: internal compiler error: in extract_insn, at recog.c:2188
 
 This bug is possibly related to bug 9352, although that one used g++ on a 
 different platform.