diff options
| author | Kazu Hirata <kazu@cs.umass.edu> | 2005-02-21 19:47:40 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2005-02-21 19:47:40 +0000 |
| commit | 88312d26a5b32bf7ae7d593d8c12517623106c6f (patch) | |
| tree | 5527b039f988d6e0b9585b5f8a80477d6ee437bc | |
| parent | fca01525bf39af39d545094e75cb72276f46013c (diff) | |
| download | gcc-88312d26a5b32bf7ae7d593d8c12517623106c6f.zip gcc-88312d26a5b32bf7ae7d593d8c12517623106c6f.tar.gz gcc-88312d26a5b32bf7ae7d593d8c12517623106c6f.tar.bz2 | |
flow.c (delete_dead_jumptables): Speed up by scanning insns that do not belong to any basic block.
* flow.c (delete_dead_jumptables): Speed up by scanning insns
that do not belong to any basic block.
From-SVN: r95342
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/flow.c | 40 |
2 files changed, 30 insertions, 13 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e18b08a..fea868a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -7,6 +7,9 @@ and 1. (find_taken_edge_switch_expr): Remove a check for INTEGER_CST. + * flow.c (delete_dead_jumptables): Speed up by scanning insns + that do not belong to any basic block. + 2005-02-21 Jeff Law <law@redhat.com> * cfganal.c (find_unreachable_blocks): Manually CSE load of @@ -817,21 +817,35 @@ delete_noop_moves (void) void delete_dead_jumptables (void) { - rtx insn, next; - for (insn = get_insns (); insn; insn = next) + basic_block bb; + + /* A dead jump table does not belong to any basic block. Scan insns + between two adjacent basic blocks. */ + FOR_EACH_BB (bb) { - next = NEXT_INSN (insn); - if (LABEL_P (insn) - && LABEL_NUSES (insn) == LABEL_PRESERVE_P (insn) - && JUMP_P (next) - && (GET_CODE (PATTERN (next)) == ADDR_VEC - || GET_CODE (PATTERN (next)) == ADDR_DIFF_VEC)) + rtx insn, next; + + for (insn = NEXT_INSN (BB_END (bb)); + insn && !NOTE_INSN_BASIC_BLOCK_P (insn); + insn = next) { - if (dump_file) - fprintf (dump_file, "Dead jumptable %i removed\n", INSN_UID (insn)); - delete_insn (NEXT_INSN (insn)); - delete_insn (insn); - next = NEXT_INSN (next); + next = NEXT_INSN (insn); + if (LABEL_P (insn) + && LABEL_NUSES (insn) == LABEL_PRESERVE_P (insn) + && JUMP_P (next) + && (GET_CODE (PATTERN (next)) == ADDR_VEC + || GET_CODE (PATTERN (next)) == ADDR_DIFF_VEC)) + { + rtx label = insn, jump = next; + + if (dump_file) + fprintf (dump_file, "Dead jumptable %i removed\n", + INSN_UID (insn)); + + next = NEXT_INSN (next); + delete_insn (jump); + delete_insn (label); + } } } } |