simplify-rtx.c (simplify_ternary_operation): Add simplification for (!c) != {0,....

[gcc.git] / gcc / simplify-rtx.c

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 91e4b9ca0cea75ff9e4d72940aba31e821be6d17..fde99445e54d6f755d10e3fee1624df650e4581e 100644 (file)
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -5247,6 +5247,32 @@ simplify_ternary_operation (enum rtx_code code, machine_mode mode,
                  && rtx_equal_p (XEXP (op0, 1), op1))))
        return op2;
 
+      /* Convert (!c) != {0,...,0} ? a : b into
+         c != {0,...,0} ? b : a for vector modes.  */
+      if (VECTOR_MODE_P (GET_MODE (op1))
+         && GET_CODE (op0) == NE
+         && GET_CODE (XEXP (op0, 0)) == NOT
+         && GET_CODE (XEXP (op0, 1)) == CONST_VECTOR)
+       {
+         rtx cv = XEXP (op0, 1);
+         int nunits = CONST_VECTOR_NUNITS (cv);
+         bool ok = true;
+         for (int i = 0; i < nunits; ++i)
+           if (CONST_VECTOR_ELT (cv, i) != const0_rtx)
+             {
+               ok = false;
+               break;
+             }
+         if (ok)
+           {
+             rtx new_op0 = gen_rtx_NE (GET_MODE (op0),
+                                       XEXP (XEXP (op0, 0), 0),
+                                       XEXP (op0, 1));
+             rtx retval = gen_rtx_IF_THEN_ELSE (mode, new_op0, op2, op1);
+             return retval;
+           }
+       }
+
       if (COMPARISON_P (op0) && ! side_effects_p (op0))
        {
          machine_mode cmp_mode = (GET_MODE (XEXP (op0, 0)) == VOIDmode