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| author | Tom Tromey <tromey@redhat.com> | 2002-06-04 22:09:43 +0000 |
|---|---|---|
| committer | Tom Tromey <tromey@gcc.gnu.org> | 2002-06-04 22:09:43 +0000 |
| commit | f06cafdf4bcb9a91b99c4d8bd058c62bfccde4b3 (patch) | |
| tree | dfd466d2608e3f1aa9a7cbd415ee7b23dbb6e9d9 /gcc/java/jcf-write.c | |
| parent | 0bb5f0e400a976f0346f2cfc9a7416abbda92cf5 (diff) | |
| download | gcc-f06cafdf4bcb9a91b99c4d8bd058c62bfccde4b3.zip gcc-f06cafdf4bcb9a91b99c4d8bd058c62bfccde4b3.tar.gz gcc-f06cafdf4bcb9a91b99c4d8bd058c62bfccde4b3.tar.bz2 | |
* jcf-write.c (perform_relocations): Optmize a goto to a goto.
From-SVN: r54264
Diffstat (limited to 'gcc/java/jcf-write.c')
| -rw-r--r-- | gcc/java/jcf-write.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/gcc/java/jcf-write.c b/gcc/java/jcf-write.c index 7ddca44..f419e9f 100644 --- a/gcc/java/jcf-write.c +++ b/gcc/java/jcf-write.c @@ -2677,6 +2677,37 @@ perform_relocations (state) shrink += 3; } + /* Optimize GOTO L; ... L: GOTO X by changing the first goto to + jump directly to X. We're careful here to avoid an infinite + loop if the `goto's themselves form one. We do this + optimization because we can generate a goto-to-goto for some + try/finally blocks. */ + while (reloc != NULL + && reloc->kind == OPCODE_goto_w + && reloc->label != block + && reloc->label->v.chunk->data != NULL + && reloc->label->v.chunk->data[0] == OPCODE_goto) + { + /* Find the reloc for the first instruction of the + destination block. */ + struct jcf_relocation *first_reloc; + for (first_reloc = reloc->label->u.relocations; + first_reloc; + first_reloc = first_reloc->next) + { + if (first_reloc->offset == 1 + && first_reloc->kind == OPCODE_goto_w) + { + reloc->label = first_reloc->label; + break; + } + } + + /* If we didn't do anything, exit the loop. */ + if (first_reloc == NULL) + break; + } + for (reloc = block->u.relocations; reloc != NULL; reloc = reloc->next) { if (reloc->kind == SWITCH_ALIGN_RELOC) |