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| author | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-10-08 18:09:41 +0000 |
|---|---|---|
| committer | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-10-08 18:09:41 +0000 |
| commit | a9ef98778deaf3b83ca1349ad09e7b15ce908158 (patch) | |
| tree | eb195a552c62fbc24735e6506d9aa729f6806b75 /gcc/loop-unswitch.c | |
| parent | 514d377a3dcb7aeb49113b23d70fc87f6304a30e (diff) | |
| download | gcc-a9ef98778deaf3b83ca1349ad09e7b15ce908158.tar.gz | |
* loop-unswitch.c (unswitch_single_loop): Use
estimated_loop_iterations_int to prevent unswitching when loop
is known to not roll.
* tree-ssa-loop-niter.c (estimated_loop_iterations): Do not segfault
when SCEV is not initialized.
(max_loop_iterations): Likewise.
* tree-ssa-loop-unswitch.c (tree_ssa_unswitch_loops): Use
estimated_loop_iterations_int to prevent unswithcing when
loop is known to not roll.
* tree-scalar-evolution.c (scev_initialized_p): New function.
* tree-scalar-evolution.h (scev_initialized_p): Likewise.
* loop-unroll.c (decide_peel_once_rolling): Use
max_loop_iterations_int.
(unroll_loop_constant_iterations): Update
nb_iterations_upper_bound and nb_iterations_estimate.
(decide_unroll_runtime_iterations): Use
estimated_loop_iterations or max_loop_iterations;
(unroll_loop_runtime_iterations): fix profile updating.
(decide_peel_simple): Use estimated_loop_iterations
and max_loop_iterations.
(decide_unroll_stupid): Use estimated_loop_iterations
ad max_loop_iterations.
* loop-doloop.c (doloop_modify): Use max_loop_iterations_int.
(doloop_optimize): Likewise.
* loop-iv.c (iv_number_of_iterations): Use record_niter_bound.
(find_simple_exit): Likewise.
* cfgloop.h (struct niter_desc): Remove niter_max.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@192219 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/loop-unswitch.c')
| -rw-r--r-- | gcc/loop-unswitch.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/loop-unswitch.c b/gcc/loop-unswitch.c index a9089a66cdf..4107048de01 100644 --- a/gcc/loop-unswitch.c +++ b/gcc/loop-unswitch.c @@ -257,6 +257,7 @@ unswitch_single_loop (struct loop *loop, rtx cond_checked, int num) rtx cond, rcond = NULL_RTX, conds, rconds, acond, cinsn; int repeat; edge e; + HOST_WIDE_INT iterations; /* Do not unswitch too much. */ if (num > PARAM_VALUE (PARAM_MAX_UNSWITCH_LEVEL)) @@ -299,7 +300,8 @@ unswitch_single_loop (struct loop *loop, rtx cond_checked, int num) } /* Nor if the loop usually does not roll. */ - if (expected_loop_iterations (loop) < 1) + iterations = estimated_loop_iterations_int (loop); + if (iterations >= 0 && iterations <= 1) { if (dump_file) fprintf (dump_file, ";; Not unswitching, loop iterations < 1\n"); |