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simplify-rtx.c (simplify_binary_operation_1): Handle more cases for the "(and X (ior (not X) Y) -> (and X Y)" transform.

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* simplify-rtx.c (simplify_binary_operation_1): Handle more cases
	for the "(and X (ior (not X) Y) -> (and X Y)" transform.

From-SVN: r219217
This commit is contained in:
Segher Boessenkool 2015-01-06 05:29:03 +01:00 committed by Segher Boessenkool
parent 2f48c66c9d
commit 31dd2a8669
2 changed files with 19 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-01-05 Segher Boessenkool <segher@kernel.crashing.org>
* simplify-rtx.c (simplify_binary_operation_1): Handle more cases
for the "(and X (ior (not X) Y) -> (and X Y)" transform.
2015-01-05 Segher Boessenkool <segher@kernel.crashing.org>
* combine.c (combine_validate_cost): Do not count the cost of a

16
gcc/simplify-rtx.c
View File

@ -2933,15 +2933,27 @@ simplify_binary_operation_1 (enum rtx_code code, machine_mode mode,
/* (and X (ior (not X) Y) -> (and X Y) */
if (GET_CODE (op1) == IOR
&& GET_CODE (XEXP (op1, 0)) == NOT
&& op0 == XEXP (XEXP (op1, 0), 0))
&& rtx_equal_p (op0, XEXP (XEXP (op1, 0), 0)))
return simplify_gen_binary (AND, mode, op0, XEXP (op1, 1));
/* (and (ior (not X) Y) X) -> (and X Y) */
if (GET_CODE (op0) == IOR
&& GET_CODE (XEXP (op0, 0)) == NOT
&& op1 == XEXP (XEXP (op0, 0), 0))
&& rtx_equal_p (op1, XEXP (XEXP (op0, 0), 0)))
return simplify_gen_binary (AND, mode, op1, XEXP (op0, 1));
/* (and X (ior Y (not X)) -> (and X Y) */
if (GET_CODE (op1) == IOR
&& GET_CODE (XEXP (op1, 1)) == NOT
&& rtx_equal_p (op0, XEXP (XEXP (op1, 1), 0)))
return simplify_gen_binary (AND, mode, op0, XEXP (op1, 0));
/* (and (ior Y (not X)) X) -> (and X Y) */
if (GET_CODE (op0) == IOR
&& GET_CODE (XEXP (op0, 1)) == NOT
&& rtx_equal_p (op1, XEXP (XEXP (op0, 1), 0)))
return simplify_gen_binary (AND, mode, op1, XEXP (op0, 0));
tem = simplify_byte_swapping_operation (code, mode, op0, op1);
if (tem)
return tem;