diff options
| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-04-20 07:56:50 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-04-20 07:56:50 +0000 |
| commit | 75f841040798e4e1456d6f74d5fffb5b6654cdb1 (patch) | |
| tree | 4120801b04df0c391df22ca45c74588def05e73a /gcc/gcse.c | |
| parent | 68edee876f4838b470552143a8de6d60a1c5d68f (diff) | |
| download | gcc-75f841040798e4e1456d6f74d5fffb5b6654cdb1.tar.gz | |
* gcse.c (gcse_main): Fix comment typo.
(delete_null_pointer_check): Likewise.
(hash_scan_set): Don't consider sets with REG_EQUIV MEM notes.
* cse.c (cse_insn): Likewise.
* function.c (fixup_var_refs_insns_with_hash): The sequence is
toplevel.
* gcc.c-torture/execute/20010403-1.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@41444 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/gcc/gcse.c b/gcc/gcse.c index 56117f9a170..dc531c56c7f 100644 --- a/gcc/gcse.c +++ b/gcc/gcse.c @@ -756,7 +756,7 @@ gcse_main (f, file) a high connectivity will take a long time and is unlikely to be particularly useful. - In normal circumstances a cfg should have about twice has many edges + In normal circumstances a cfg should have about twice as many edges as blocks. But we do not want to punish small functions which have a couple switch statements. So we require a relatively large number of basic blocks and the ratio of edges to blocks to be high. */ @@ -2208,7 +2208,14 @@ hash_scan_set (pat, insn, set_p) /* Is SET_SRC something we want to gcse? */ && want_to_gcse_p (src) /* Don't CSE a nop. */ - && ! set_noop_p (pat)) + && ! set_noop_p (pat) + /* Don't GCSE if it has attached REG_EQUIV note. + At this point this only function parameters should have + REG_EQUIV notes and if the argument slot is used somewhere + explicitely, it means address of parameter has been taken, + so we should not extend the lifetime of the pseudo. */ + && ((note = find_reg_note (insn, REG_EQUIV, NULL_RTX)) == 0 + || GET_CODE (XEXP (note, 0)) != MEM)) { /* An expression is not anticipatable if its operands are modified before this insn or if this is not the only SET in @@ -5541,7 +5548,7 @@ delete_null_pointer_checks (f) a high connectivity will take a long time and is unlikely to be particularly useful. - In normal circumstances a cfg should have about twice has many edges + In normal circumstances a cfg should have about twice as many edges as blocks. But we do not want to punish small functions which have a couple switch statements. So we require a relatively large number of basic blocks and the ratio of edges to blocks to be high. */ |