diff options
| author | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-04-26 21:17:17 +0000 |
|---|---|---|
| committer | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-04-26 21:17:17 +0000 |
| commit | 330ce56e9706c62150a51f6cdbe25763e487aa08 (patch) | |
| tree | 1c9584cc811e8ac51bda3af95fc87e52d368d92a /gcc/df-problems.c | |
| parent | 7e0cc44b5556d3373286d37ec32d0302848bf0b5 (diff) | |
| download | gcc-330ce56e9706c62150a51f6cdbe25763e487aa08.tar.gz | |
* df-problems.c (df_simulate_initialize_forwards): Set, don't clear,
bits for artificial defs at the top of the block.
* fwprop.c (single_def_use_enter_block): Don't call it.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@158750 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/df-problems.c')
| -rw-r--r-- | gcc/df-problems.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/gcc/df-problems.c b/gcc/df-problems.c index fb899096e49..dbb469e1e2f 100644 --- a/gcc/df-problems.c +++ b/gcc/df-problems.c @@ -3913,13 +3913,9 @@ df_simulate_finalize_backwards (basic_block bb, bitmap live) the block, starting with the first one. ----------------------------------------------------------------------------*/ -/* Apply the artificial uses and defs at the top of BB in a forwards - direction. ??? This is wrong; defs mark the point where a pseudo - becomes live when scanning forwards (unless a def is unused). Since - there are no REG_UNUSED notes for artificial defs, passes that - require artificial defs probably should not call this function - unless (as is the case for fwprop) they are correct when liveness - bitmaps are *under*estimated. */ +/* Initialize the LIVE bitmap, which should be copied from DF_LIVE_IN or + DF_LR_IN for basic block BB, for forward scanning by marking artificial + defs live. */ void df_simulate_initialize_forwards (basic_block bb, bitmap live) @@ -3931,7 +3927,7 @@ df_simulate_initialize_forwards (basic_block bb, bitmap live) { df_ref def = *def_rec; if (DF_REF_FLAGS (def) & DF_REF_AT_TOP) - bitmap_clear_bit (live, DF_REF_REGNO (def)); + bitmap_set_bit (live, DF_REF_REGNO (def)); } } |