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re PR rtl-optimization/78241 (wrong code with -funroll-loops)

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PR rtl-optimization/78241
	* loop-unroll.c (unroll_loop_runtime_iterations): Don't adjust 'niter', but
	emit initial peel copy if niter expr is not reliable.

	* gcc.dg/pr78241.c: New test.

From-SVN: r242047
This commit is contained in:
Pat Haugen 2016-11-10 18:55:57 +00:00 committed by Pat Haugen
parent a156669665
commit 8d34bfa865
4 changed files with 36 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-11-10 Pat Haugen <pthaugen@us.ibm.com>
PR rtl-optimization/78241
* loop-unroll.c (unroll_loop_runtime_iterations): Don't adjust 'niter', but
emit initial peel copy if niter expr is not reliable.
2016-11-10 Segher Boessenkool <segher@kernel.crashing.org>
* dwarf2cfi.c (dump_cfi_row): Add forward declaration.

9
gcc/loop-unroll.c
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@ -918,9 +918,10 @@ unroll_loop_runtime_iterations (struct loop *loop)
if (tmp != niter)
emit_move_insn (niter, tmp);
/* For loops that exit at end, add one to niter to account for first pass
through loop body before reaching exit test. */
if (exit_at_end)
/* For loops that exit at end and whose number of iterations is reliable,
add one to niter to account for first pass through loop body before
reaching exit test. */
if (exit_at_end && !desc->noloop_assumptions)
{
niter = expand_simple_binop (desc->mode, PLUS,
niter, const1_rtx,
@ -946,7 +947,7 @@ unroll_loop_runtime_iterations (struct loop *loop)
auto_sbitmap wont_exit (max_unroll + 2);
if (extra_zero_check)
if (extra_zero_check || desc->noloop_assumptions)
{
/* Peel the first copy of loop body. Leave the exit test if the number
of iterations is not reliable. Also record the place of the extra zero

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-11-10 Pat Haugen <pthaugen@us.ibm.com>
PR rtl-optimization/78241
* gcc.dg/pr78241.c: New test.
2016-11-10 Jakub Jelinek <jakub@redhat.com>
* gfortran.dg/openmp-define-3.f90: Expect 201511 instead of

20
gcc/testsuite/gcc.dg/pr78241.c Normal file
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@ -0,0 +1,20 @@
/* { dg-do run } */
/* { dg-options "-Og -funroll-loops" } */
static __attribute__((noinline, noclone)) unsigned
foo (unsigned x)
{
do
x++;
while (x <= 15);
return x;
}
int main ()
{
unsigned x = foo (-2);
if (x != (unsigned)-1)
__builtin_abort();
return 0;
}