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re PR rtl-optimization/89588 (ICE in unroll_loop_constant_iterations, at loop-unroll.c:498)

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PR rtl-optimization/89588
	* loop-unroll.c (decide_unroll_constant_iterations): Make guard for
	explicit unrolling factor more robust.

From-SVN: r269579
This commit is contained in:
Eric Botcazou 2019-03-11 11:37:46 +00:00 committed by Eric Botcazou
parent 03001a3515
commit cb90c00140
4 changed files with 20 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-03-11 Eric Botcazou <ebotcazou@adacore.com>
PR rtl-optimization/89588
* loop-unroll.c (decide_unroll_constant_iterations): Make guard for
explicit unrolling factor more robust.
2019-03-11 Richard Biener <rguenther@suse.de>
PR tree-optimization/89649

2
gcc/loop-unroll.c
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@ -400,7 +400,7 @@ decide_unroll_constant_iterations (struct loop *loop, int flags)
{
/* However we cannot unroll completely at the RTL level a loop with
constant number of iterations; it should have been peeled instead. */
if ((unsigned) loop->unroll - 1 > desc->niter - 2)
if ((unsigned) loop->unroll > desc->niter - 1)
{
if (dump_file)
fprintf (dump_file, ";; Loop should have been peeled\n");

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2019-03-11 Eric Botcazou <ebotcazou@adacore.com>
* c-c++-common/unroll-6.c: New test.
2019-03-11 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/87571

9
gcc/testsuite/c-c++-common/unroll-6.c Normal file
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@ -0,0 +1,9 @@
/* { dg-do compile } */
/* { dg-options "-O -fno-tree-loop-optimize" } */
void test (void)
{
#pragma GCC unroll 2
for (int nv = 0; nv <= 2; nv += 2)
{}
}