re PR rtl-optimization/51023 (likely integer wrong code bug)

[gcc.git] / gcc / ChangeLog

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+2011-11-10  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/51023
+       * combine.c (simplify_comparison) <case SIGN_EXTEND>: Don't use
+       val_signbit_known_clear_p for signed comparison narrowing
+       optimization.  Don't check for non-VOIDmode, use
+       HWI_COMPUTABLE_MODE_P macro.
+       <case ZERO_EXTEND>: Don't check for non-VOIDmode.
+       Optimize even when const_op is equal to GET_MODE_MASK (mode),
+       don't optimize if const_op is negative.
+
 2011-11-10  Richard Guenther  <rguenther@suse.de>
 
        PR tree-optimization/51042