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Re: [1/4] Using gen_int_mode instead of GEN_INT


James Greenhalgh <james.greenhalgh@arm.com> writes:
> On Tue, Sep 10, 2013 at 08:09:42PM +0100, Richard Sandiford wrote:
>> Sorry for the breakage.  gen_int_mode and GEN_INT really are only for
>> scalar integers though.  (So is plus_constant.)  Vector constants should
>> be CONST_VECTORs rather than CONST_INTs.
>> 
>> I think the gcc.target/aarch64/vect-fcm-eq-d.c failure is from a latent
>> bug in the way (neg (not ...)) and (not (neg ...)) are handled.
>> Could you give the attached patch a go?
>
> Thanks Richard, this patch fixes the test FAILs I was seeing.

Now bootstrapped & regression-tested on x86_64-linux-gnu.  OK to install?

Thanks,
Richard


gcc/
	* simplify-rtx.c (simplify_unary_operation_1): Use simplify_gen_binary
	for (not (neg ...)) and (neg (not ...)) casees.

Index: gcc/simplify-rtx.c
===================================================================
--- gcc/simplify-rtx.c	2013-09-10 20:02:08.756091875 +0100
+++ gcc/simplify-rtx.c	2013-09-10 20:02:09.002093907 +0100
@@ -825,7 +825,8 @@ simplify_unary_operation_1 (enum rtx_cod
 
       /* Similarly, (not (neg X)) is (plus X -1).  */
       if (GET_CODE (op) == NEG)
-	return plus_constant (mode, XEXP (op, 0), -1);
+	return simplify_gen_binary (PLUS, mode, XEXP (op, 0),
+				    CONSTM1_RTX (mode));
 
       /* (not (xor X C)) for C constant is (xor X D) with D = ~C.  */
       if (GET_CODE (op) == XOR
@@ -932,7 +933,8 @@ simplify_unary_operation_1 (enum rtx_cod
 
       /* Similarly, (neg (not X)) is (plus X 1).  */
       if (GET_CODE (op) == NOT)
-	return plus_constant (mode, XEXP (op, 0), 1);
+	return simplify_gen_binary (PLUS, mode, XEXP (op, 0),
+				    CONST1_RTX (mode));
 
       /* (neg (minus X Y)) can become (minus Y X).  This transformation
 	 isn't safe for modes with signed zeros, since if X and Y are


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