patch to psim for denormal values

Geoff Keating geoffk@cygnus.com
Fri Mar 24 16:08:00 GMT 2000


gcc/testsuite/gcc.c-torture/execute/ieee/20000320-1.c was sending the
sim into a very long (perhaps infinite) loop, because of this typo.

My copy of the ppc 601 user's manual correctly uses '+' here (on page
F-2).

OK to commit?

-- 
- Geoffrey Keating <geoffk@cygnus.com>

===File ~/patches/cygnus/sim-ppc-denormal.patch=============
2000-03-23  Geoff Keating  <geoffk@cygnus.com>

	* ppc-instructions (Disabled_Exponent_Underflow): Increment
	the exponent when denormalizing.

Index: ppc-instructions
===================================================================
RCS file: /cvs/cvsfiles/devo/sim/ppc/ppc-instructions,v
retrieving revision 1.46
diff -p -u -u -p -r1.46 ppc-instructions
--- ppc-instructions	2000/03/02 09:24:10	1.46
+++ ppc-instructions	2000/03/24 01:53:30
@@ -4282,7 +4282,7 @@ void::function::invalid_zero_divide_oper
 	  }
 	    /* G|R|X == zero from above */
 	    while (exp < -126) {
-	      exp = exp - 1;
+	      exp = exp + 1;
 	      frac_grx = (INSERTED64(EXTRACTED64(frac_grx, 0, 54), 1, 55)
 	                  | MASKED64(frac_grx, 55, 55));
 	    }
============================================================


More information about the Gdb-patches mailing list