This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: possible gcse failure: not able to eliminate redundant loads

Richard Henderson wrote:


On Fri, Dec 13, 2002 at 11:26:34AM +0530, Sanjiv Kumar Gupta, Noida wrote:


       b[2] = a[1];
       for (j = 0; j < i; j++)
       {
              if (i)
                  b[3] = a[1];



Yes, this requires more knowledge than is present in loop.

Ignoring the first statement, we cannot hoist a[1] because
it is only conditionally executed and might trap.




Duh ;-)  Can we disable this notion of loads-that-might-trap from a frontend ?

I cannot imagine a valid Fortran program that contains an access to memory that 
"might trap".



[ Silly things to do with your computer on a rainy Sunday afternoon:



  1. Stand out in the rain.



  - with apologies to Monty Python ]



--

Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290

Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands

Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html

Join GNU Fortran 95: http://g95.sourceforge.net/ (under construction)


















  
Index Nav:
      
        [Date Index] [Subject Index] [Author Index] [Thread Index]
      
  

  
Message Nav:
      [Date Prev] [Date Next]
      [Thread Prev] [Thread Next]