5 ms·

I've fixed this now in all the PHP branches. http://svn.php.net/viewvc/?view=revision&revision=307095 http://svn.php.net/viewvc/?view=revision&revision=307095

• roel_v 16y ago
  Interesting. I've never used 'volatile', would you mind explaining how it works in this case?
  • scottmac 16y ago
    The copying from the 80-bit register to the 64-bit memory cell is causing the result to be corrupted. When we use volatile it tells the compiler not to apply the optimisation which in this case was putting it in a register.
    • roel_v 16y ago
      But doesn't that make it a compiler bug? If the root cause is that the compiler truncates data it shouldn't, does that mean the fundamental issue is a compiler bug?
      • scottmac 16y ago
        It's a hardware issue with the x87 instruction set, http://gcc.gnu.org/ml/gcc/2003-08/msg01195.html http://gcc.gnu.org/ml/gcc/2003-08/msg01195.html is a good explanation.
        • roel_v 16y ago
          Ah I see, thank you. Hairy problem.