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Subject: [Bug tree-optimization/54471] [4.8 Regression] FAIL: gcc.dg/sms-8.c execution test
Date: Wed, 21 Nov 2012 17:19:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54471

--- Comment #9 from Marc Glisse <glisse at gcc dot gnu.org> 2012-11-21 17:18:47 UTC ---
Jakub, your patch makes sense to me (or min0.is_zero() and min1.is_zero()). I
am ashamed I managed to get products with [0,n] (with n larger than MAX/2)
wrong. Good thing Kenneth Zadeck's wide_int will soon allow us to remove most
of this horrible code.

Another test that shows the error (optimizes away the call to g):

void g();
void h();
void f(unsigned __int128 x){
  if(x>(unsigned __int128)(-3))return;
  unsigned __int128 y=2*x;
  if(y==42) g();
  else h();
}