diff options
Diffstat (limited to 'gcc/loop-iv.c')
| -rw-r--r-- | gcc/loop-iv.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c index 3e1b5db..824629c 100644 --- a/gcc/loop-iv.c +++ b/gcc/loop-iv.c @@ -22,9 +22,10 @@ along with GCC; see the file COPYING3. If not see doloop optimization and branch prediction. The iv information is computed on demand. - Induction variable is analyzed by walking the use-def chains. When a biv - is found, it is cached in the bivs hash table. When register is proved - to be a giv, its description is stored to DF_REF_DATA of the def reference. + Induction variables are analyzed by walking the use-def chains. When + a basic induction variable (biv) is found, it is cached in the bivs + hash table. When register is proved to be a biv, its description + is stored to DF_REF_DATA of the def reference. The analysis works always with one loop -- you must call iv_analysis_loop_init (loop) for it. All the other functions then work with @@ -277,6 +278,7 @@ iv_analysis_loop_init (struct loop *loop) df_remove_problem (df_chain); df_process_deferred_rescans (); df_chain_add_problem (DF_UD_CHAIN); + df_set_flags (DF_RD_NO_TRIM); df_set_blocks (blocks); df_analyze (); if (dump_file) |