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| author | Jakub Jelinek <jakub@redhat.com> | 2009-05-16 09:12:02 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2009-05-16 09:12:02 +0200 |
| commit | 40a8f07a47f1192d06e895ce1a4d0fc91a723743 (patch) | |
| tree | 6e8f264af352b2d4f86c2430ec273c272f874f45 /gcc/final.c | |
| parent | a99c6711f83e23596c5fdbf575484e3fa34d6e45 (diff) | |
| download | gcc-40a8f07a47f1192d06e895ce1a4d0fc91a723743.zip gcc-40a8f07a47f1192d06e895ce1a4d0fc91a723743.tar.gz gcc-40a8f07a47f1192d06e895ce1a4d0fc91a723743.tar.bz2 | |
re PR target/39942 (Nonoptimal code - leaveq; xchg %ax,%ax; retq)
PR target/39942
* final.c (label_to_max_skip): New function.
(label_to_alignment): Only use LABEL_TO_ALIGNMENT if
CODE_LABEL_NUMBER <= max_labelno.
* output.h (label_to_max_skip): New prototype.
* config/i386/i386.c (ix86_avoid_jump_misspredicts): Renamed to...
(ix86_avoid_jump_mispredicts): ... this. Don't define if
ASM_OUTPUT_MAX_SKIP_ALIGN isn't defined. Update comment.
Handle CODE_LABELs with >= 16 byte alignment or with
max_skip == (1 << align) - 1.
(ix86_reorg): Don't call ix86_avoid_jump_mispredicts if
ASM_OUTPUT_MAX_SKIP_ALIGN isn't defined.
From-SVN: r147607
Diffstat (limited to 'gcc/final.c')
| -rw-r--r-- | gcc/final.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/final.c b/gcc/final.c index 30ccc85..3c2e364 100644 --- a/gcc/final.c +++ b/gcc/final.c @@ -553,7 +553,17 @@ static int min_labelno, max_labelno; int label_to_alignment (rtx label) { - return LABEL_TO_ALIGNMENT (label); + if (CODE_LABEL_NUMBER (label) <= max_labelno) + return LABEL_TO_ALIGNMENT (label); + return 0; +} + +int +label_to_max_skip (rtx label) +{ + if (CODE_LABEL_NUMBER (label) <= max_labelno) + return LABEL_TO_MAX_SKIP (label); + return 0; } #ifdef HAVE_ATTR_length |