diff options
Diffstat (limited to 'gcc/cprop.c')
| -rw-r--r-- | gcc/cprop.c | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/gcc/cprop.c b/gcc/cprop.c index 6f34f6b..aca319a 100644 --- a/gcc/cprop.c +++ b/gcc/cprop.c @@ -963,10 +963,6 @@ cprop_jump (basic_block bb, rtx_insn *setcc, rtx_insn *jump, rtx from, rtx src) remove_note (jump, note); } - /* Delete the cc0 setter. */ - if (HAVE_cc0 && setcc != NULL && CC0_P (SET_DEST (single_set (setcc)))) - delete_insn (setcc); - global_const_prop_count++; if (dump_file != NULL) { @@ -1009,15 +1005,15 @@ constprop_register (rtx from, rtx src, rtx_insn *insn) rtx sset; rtx_insn *next_insn; - /* Check for reg or cc0 setting instructions followed by - conditional branch instructions first. */ + /* Check for reg setting instructions followed by conditional branch + instructions first. */ if ((sset = single_set (insn)) != NULL && (next_insn = next_nondebug_insn (insn)) != NULL && any_condjump_p (next_insn) && onlyjump_p (next_insn)) { rtx dest = SET_DEST (sset); - if ((REG_P (dest) || CC0_P (dest)) + if (REG_P (dest) && cprop_jump (BLOCK_FOR_INSN (insn), insn, next_insn, from, src)) return 1; @@ -1636,8 +1632,7 @@ bypass_block (basic_block bb, rtx_insn *setcc, rtx_insn *jump) /* Avoid unification of the edge with other edges from original branch. We would end up emitting the instruction on "both" edges. */ - if (dest && setcc && !CC0_P (SET_DEST (PATTERN (setcc))) - && find_edge (e->src, dest)) + if (dest && setcc && find_edge (e->src, dest)) dest = NULL; old_dest = e->dest; @@ -1647,13 +1642,11 @@ bypass_block (basic_block bb, rtx_insn *setcc, rtx_insn *jump) { redirect_edge_and_branch_force (e, dest); - /* Copy the register setter to the redirected edge. - Don't copy CC0 setters, as CC0 is dead after jump. */ + /* Copy the register setter to the redirected edge. */ if (setcc) { rtx pat = PATTERN (setcc); - if (!CC0_P (SET_DEST (pat))) - insert_insn_on_edge (copy_insn (pat), e); + insert_insn_on_edge (copy_insn (pat), e); } if (dump_file != NULL) @@ -1719,7 +1712,7 @@ bypass_conditional_jumps (void) break; dest = SET_DEST (PATTERN (insn)); - if (REG_P (dest) || CC0_P (dest)) + if (REG_P (dest)) setcc = insn; else break; |