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re PR middle-end/71762 (~X & Y to X < Y doesn't work for uninitialized values)
2016-11-23 Richard Biener <rguenther@suse.de> PR middle-end/71762 * match.pd ((~X & Y) -> X < Y, (X & ~Y) -> Y < X, (~X | Y) -> X <= Y, (X | ~Y) -> Y <= X): Remove. * gcc.dg/torture/pr71762-1.c: New testcase. * gcc.dg/torture/pr71762-2.c: Likewise. * gcc.dg/torture/pr71762-3.c: Likewise. * gcc.dg/tree-ssa/forwprop-28.c: XFAIL. From-SVN: r242747
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@ -1,3 +1,9 @@
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2016-11-23 Richard Biener <rguenther@suse.de>
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PR middle-end/71762
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* match.pd ((~X & Y) -> X < Y, (X & ~Y) -> Y < X,
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(~X | Y) -> X <= Y, (X | ~Y) -> Y <= X): Remove.
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2016-11-23 Richard Biener <rguenther@suse.de>
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PR lto/78472
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27
gcc/match.pd
27
gcc/match.pd
@ -963,33 +963,6 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
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(op:c truth_valued_p@0 (logical_inverted_value @0))
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{ constant_boolean_node (op == NE_EXPR ? true : false, type); }))
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/* If arg1 and arg2 are booleans (or any single bit type)
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then try to simplify:
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(~X & Y) -> X < Y
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(X & ~Y) -> Y < X
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(~X | Y) -> X <= Y
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(X | ~Y) -> Y <= X
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But only do this if our result feeds into a comparison as
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this transformation is not always a win, particularly on
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targets with and-not instructions.
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-> simplify_bitwise_binary_boolean */
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(simplify
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(ne (bit_and:c (bit_not @0) @1) integer_zerop)
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(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
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&& TYPE_PRECISION (TREE_TYPE (@1)) == 1)
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(if (TYPE_UNSIGNED (TREE_TYPE (@1)))
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(lt @0 @1)
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(gt @0 @1))))
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(simplify
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(ne (bit_ior:c (bit_not @0) @1) integer_zerop)
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(if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
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&& TYPE_PRECISION (TREE_TYPE (@1)) == 1)
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(if (TYPE_UNSIGNED (TREE_TYPE (@1)))
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(le @0 @1)
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(ge @0 @1))))
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/* ~~x -> x */
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(simplify
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(bit_not (bit_not @0))
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@ -1,3 +1,11 @@
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2016-11-23 Richard Biener <rguenther@suse.de>
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PR middle-end/71762
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* gcc.dg/torture/pr71762-1.c: New testcase.
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* gcc.dg/torture/pr71762-2.c: Likewise.
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* gcc.dg/torture/pr71762-3.c: Likewise.
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* gcc.dg/tree-ssa/forwprop-28.c: XFAIL.
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2016-11-23 Richard Biener <rguenther@suse.de>
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PR lto/78472
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18
gcc/testsuite/gcc.dg/torture/pr71762-1.c
Normal file
18
gcc/testsuite/gcc.dg/torture/pr71762-1.c
Normal file
@ -0,0 +1,18 @@
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/* { dg-do run } */
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/* { dg-additional-options "-fdisable-rtl-init-regs" } */
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static _Bool
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foo (_Bool a, _Bool b)
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{
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int x = a && ! b;
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return x != 0;
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}
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int y = 1;
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int main()
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{
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_Bool x;
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if (foo (x, y))
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__builtin_abort ();
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return 0;
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}
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17
gcc/testsuite/gcc.dg/torture/pr71762-2.c
Normal file
17
gcc/testsuite/gcc.dg/torture/pr71762-2.c
Normal file
@ -0,0 +1,17 @@
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/* { dg-do run } */
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static _Bool
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foo (_Bool a, _Bool b)
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{
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int x = a && ! b;
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return x != 0;
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}
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int y = 1;
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int main()
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{
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_Bool x[32];
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if (foo (x[1], y))
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__builtin_abort ();
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return 0;
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}
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22
gcc/testsuite/gcc.dg/torture/pr71762-3.c
Normal file
22
gcc/testsuite/gcc.dg/torture/pr71762-3.c
Normal file
@ -0,0 +1,22 @@
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/* { dg-do run } */
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static _Bool
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foo (_Bool a, _Bool b)
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{
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int x = a && ! b;
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return x != 0;
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}
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int y = 1;
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int main()
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{
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register _Bool x
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/* Add register spec for the argv parameter to main. */
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#if __i386__ || __x86_64__
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__asm__("%esi")
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#endif
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;
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if (foo (x, y))
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__builtin_abort ();
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return 0;
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}
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