From 704a64baf9ad0bb1a2f313f44d4875e08e5e9e7c Mon Sep 17 00:00:00 2001 From: rth Date: Fri, 24 Jan 2003 02:59:58 +0000 Subject: * 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 --- gcc/ifcvt.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) (limited to 'gcc/ifcvt.c') 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); -- cgit v1.2.1