diff options
| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2002-01-10 21:00:43 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2002-01-10 21:00:43 +0000 |
| commit | ba26e2a7572b907bbaa8eb3fa2b22bc1dd477821 (patch) | |
| tree | 624a8515e72c68d7e88c18f4c57278fc7dd39492 /gcc/unroll.c | |
| parent | 6831447b2233b6fbf9f7ee1ed4d10cfddbcdcc65 (diff) | |
| download | gcc-ba26e2a7572b907bbaa8eb3fa2b22bc1dd477821.tar.gz | |
PR optimization/5269
* unroll.c (precondition_loop_p): Make *increment be the correct
sign when n_iterations known, to avoid confusing caller.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@48752 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/unroll.c')
| -rw-r--r-- | gcc/unroll.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/gcc/unroll.c b/gcc/unroll.c index 047e98395d7..df02b7c8cbb 100644 --- a/gcc/unroll.c +++ b/gcc/unroll.c @@ -1392,9 +1392,18 @@ precondition_loop_p (loop, initial_value, final_value, increment, mode) if (loop_info->n_iterations > 0) { - *initial_value = const0_rtx; - *increment = const1_rtx; - *final_value = GEN_INT (loop_info->n_iterations); + if (INTVAL (loop_info->increment) > 0) + { + *initial_value = const0_rtx; + *increment = const1_rtx; + *final_value = GEN_INT (loop_info->n_iterations); + } + else + { + *initial_value = GEN_INT (loop_info->n_iterations); + *increment = constm1_rtx; + *final_value = const0_rtx; + } *mode = word_mode; if (loop_dump_stream) |