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re PR tree-optimization/67953 (match.pd: X - (X / Y) * Y wrong on change of sign)

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PR tree-optimization/67953
	* match.pd (X - (X / Y) * Y): Don't change signedness of @0.

	* gcc.dg/fold-minus-6.c (fn4): Change the type of A to
	unsigned.
	* gcc.dg/torture/pr67953.c: New test.

From-SVN: r228839
This commit is contained in:
Marek Polacek 2015-10-15 09:39:35 +00:00 committed by Marek Polacek
parent 269ca76f4b
commit 64da3a9a3f
5 changed files with 51 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-10-15 Marek Polacek <polacek@redhat.com>
PR tree-optimization/67953
* match.pd (X - (X / Y) * Y): Don't change signedness of @0.
2015-10-15 Jiong Wang <jiong.wang@arm.com>
* config.gcc: Recognize "." in architecture base name for AArch64.

3
gcc/match.pd
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@ -267,7 +267,8 @@ along with GCC; see the file COPYING3. If not see
/* X - (X / Y) * Y is the same as X % Y. */
(simplify
(minus (convert1? @0) (convert2? (mult (trunc_div @0 @1) @1)))
(if (INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
(if ((INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
&& TYPE_UNSIGNED (TREE_TYPE (@0)) == TYPE_UNSIGNED (type))
(trunc_mod (convert @0) (convert @1))))
/* Optimize TRUNC_MOD_EXPR by a power of two into a BIT_AND_EXPR,

7
gcc/testsuite/ChangeLog
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@ -1,3 +1,10 @@
2015-10-15 Marek Polacek <polacek@redhat.com>
PR tree-optimization/67953
* gcc.dg/fold-minus-6.c (fn4): Change the type of A to
unsigned.
* gcc.dg/torture/pr67953.c: New test.
2015-10-14 Jeff Law <law@redhat.com>
* gcc.dg/tree-ssa/ssa-dom-thread-2.c: Deleted. The six functions

2
gcc/testsuite/gcc.dg/fold-minus-6.c
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@ -20,7 +20,7 @@ fn3 (long int x)
}
int
fn4 (int a, int b)
fn4 (unsigned int a, int b)
{
return a - (unsigned) ((a / b) * b);
}

36
gcc/testsuite/gcc.dg/torture/pr67953.c Normal file
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@ -0,0 +1,36 @@
/* PR tree-optimization/67953 */
/* { dg-do run } */
unsigned int
fn1 (signed int a)
{
return (unsigned int) a - ((a / 3) * 3);
}
unsigned int
fn2 (signed int a)
{
return a - ((a / 3) * 3);
}
unsigned int
fn3 (int a)
{
return a - (unsigned) ((a / 3) * 3);
}
signed int
fn4 (int a)
{
return (unsigned) a - (unsigned) ((a / 3) * 3);
}
int
main ()
{
if (fn1 (-5) != -2
|| fn2 (-5) != -2
|| fn3 (-5) != -2
|| fn4 (-5) != -2)
__builtin_abort ();
}