[Bug optimization/13718] Miscompilation of comparison of complex values

["steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From steven at gcc dot gnu dot org  2004-01-17 14:33 -------
Yup. 
 
Dump "t.c.t22.complex": 
;; Function foo (foo) 
foo (a, b) 
{ 
  complex float T.2; 
  complex float T.1; 
<bb 0>: 
  T.1 = *a_1; 
  T.2 = *b_4; 
  if (T.1 != T.2) goto <L0>; else goto <L1>; 
<L0>:; 
  abort (); 
<L1>:; 
  return; 
} 
 
Dump "t.c.t23.sra": 
Scalar replacements for foo: 
__real__ T.1 -> SR.4 
__imag__ T.1 -> SR.5 
__real__ T.2 -> SR.6 
__imag__ T.2 -> SR.7 
 
;; Function foo (foo) 
foo (a, b) 
{ 
  float SR.7; 
  float SR.6; 
  float SR.5; 
  float SR.4; 
  complex float T.2; 
  complex float T.1; 
<bb 0>: 
  SR.4_6 = REALPART_EXPR <*a_1>; 
  SR.5_3 = IMAGPART_EXPR <*a_1>; 
  SR.6_8 = REALPART_EXPR <*b_4>; 
  SR.7_9 = IMAGPART_EXPR <*b_4>; 
  if (T.1 != T.2) goto <L0>; else goto <L1>; 
<L0>:; 
  abort (); 
<L1>:; 
  return; 
} 
 
Dump "t.c.t25.dce3": 
;; Function foo (foo) 
foo (a, b) 
{ 
  float SR.7; 
  float SR.6; 
  float SR.5; 
  float SR.4; 
  complex float T.2; 
  complex float T.1; 
<bb 0>: 
  if (T.1 != T.2) goto <L0>; else goto <L1>; 
<L0>:; 
  abort (); 
<L1>:; 
  return; 
} 
 
Now where did the assignments go? 
 
BTW why isn't T.1 != T.2 folded to compare the real and imag parts? 
 
 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-01-17 14:33:20
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13718