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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. * gcc.c-torture/execute/pr51023.c: New test. From-SVN: r181257
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