diff options
| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-01-24 02:59:58 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-01-24 02:59:58 +0000 |
| commit | 704a64baf9ad0bb1a2f313f44d4875e08e5e9e7c (patch) | |
| tree | 795011f29c3d8a47649c42e9fa9e483f0e44bbb2 /gcc/ifcvt.c | |
| parent | 97d9c1afc078b2ec8706f385a98b1e01e69c3ff0 (diff) | |
| download | gcc-704a64baf9ad0bb1a2f313f44d4875e08e5e9e7c.tar.gz | |
* ifcvt.c (noce_process_if_block): Re-add check vs X being changed
in no-else-block case. Add commentary.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@61695 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/ifcvt.c')
| -rw-r--r-- | gcc/ifcvt.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index 341e7559823..ed04aefed64 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -1802,15 +1802,22 @@ noce_process_if_block (ce_info) else { insn_b = prev_nonnote_insn (if_info.cond_earliest); + /* We're going to be moving the evaluation of B down from above + COND_EARLIEST to JUMP. Make sure the relevant data is still + intact. */ if (! insn_b || GET_CODE (insn_b) != INSN || (set_b = single_set (insn_b)) == NULL_RTX || ! rtx_equal_p (x, SET_DEST (set_b)) - || reg_overlap_mentioned_p (x, cond) - || reg_overlap_mentioned_p (x, a) || reg_overlap_mentioned_p (x, SET_SRC (set_b)) || modified_between_p (SET_SRC (set_b), - PREV_INSN (if_info.cond_earliest), jump)) + PREV_INSN (if_info.cond_earliest), jump) + /* Likewise with X. In particular this can happen when + noce_get_condition looks farther back in the instruction + stream than one might expect. */ + || reg_overlap_mentioned_p (x, cond) + || reg_overlap_mentioned_p (x, a) + || modified_between_p (x, PREV_INSN (if_info.cond_earliest), jump)) insn_b = set_b = NULL_RTX; } b = (set_b ? SET_SRC (set_b) : x); |