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re PR tree-optimization/81428 (ICE: in build_one_cst, at tree.c:2079 with -O2. Fixed point division.)

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PR tree-optimization/81428
	* match.pd (X / X -> one): Don't optimize _Fract divisions, as 1
	can't be built for those types.

	* gcc.dg/fixed-point/pr81428.c: New test.

From-SVN: r250265
This commit is contained in:
Jakub Jelinek 2017-07-17 12:20:41 +02:00 • committed by Jakub Jelinek
parent f986e51e6c
commit 9ebce09858
4 changed files with 21 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-07-17 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/81428
* match.pd (X / X -> one): Don't optimize _Fract divisions, as 1
can't be built for those types.
2017-07-17 Georg-Johann Lay <avr@gjlay.de>
Remove stuff dead since r239246.

5
gcc/match.pd
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@ -243,8 +243,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* X / X is one. */
(simplify
(div @0 @0)
/* But not for 0 / 0 so that we can get the proper warnings and errors. */
(if (!integer_zerop (@0))
/* But not for 0 / 0 so that we can get the proper warnings and errors.
And not for _Fract types where we can't build 1. */
(if (!integer_zerop (@0) && !ALL_FRACT_MODE_P (TYPE_MODE (type)))
{ build_one_cst (type); }))
/* X / abs (X) is X < 0 ? -1 : 1. */
(simplify

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2017-07-17 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/81428
* gcc.dg/fixed-point/pr81428.c: New test.
PR tree-optimization/81365
* g++.dg/torture/pr81365.C: New test.

9
gcc/testsuite/gcc.dg/fixed-point/pr81428.c Normal file
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@ -0,0 +1,9 @@
/* PR tree-optimization/81428 */
/* { dg-do compile } */
/* { dg-options "-O2" } */
void
foo (long _Fract *a, long _Fract *b)
{
*b = *a / *a;
}