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| author | Kazu Hirata <kazu@cs.umass.edu> | 2004-12-13 15:43:13 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2004-12-13 15:43:13 +0000 |
| commit | 6e38fea3e4ef087b050ba2739ca26ae92b91e2ff (patch) | |
| tree | 61dd0f7809ea76fb84eecb8f232e329e195ff8f2 | |
| parent | 098b96ab3d4a27ae7123d57f9b4aea11d81a0ba5 (diff) | |
| download | gcc-6e38fea3e4ef087b050ba2739ca26ae92b91e2ff.zip gcc-6e38fea3e4ef087b050ba2739ca26ae92b91e2ff.tar.gz gcc-6e38fea3e4ef087b050ba2739ca26ae92b91e2ff.tar.bz2 | |
tree-ssa-dom.c (record_equivalences_from_phis): Add a comment.
* tree-ssa-dom.c (record_equivalences_from_phis): Add a
comment.
From-SVN: r92091
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/tree-ssa-dom.c | 4 |
2 files changed, 6 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6768b17..d991115 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -3,6 +3,9 @@ * tree-ssa-dom.c (record_equivalences_from_phis): Speed up by doing a pointer comparison. + * tree-ssa-dom.c (record_equivalences_from_phis): Add a + comment. + 2004-12-13 Kazuhiro Inaoka <inaoka.kazuhiro@renesas.com> * config/m32r/t-linux (SHLIB_MAPFILES): Add libgcc-glibc.ver to diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index def20d6..5c60979 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -1177,7 +1177,9 @@ record_equivalences_from_phis (basic_block bb) { tree t = PHI_ARG_DEF (phi, i); - /* Ignore alternatives which are the same as our LHS. */ + /* Ignore alternatives which are the same as our LHS. Since + LHS is a PHI_RESULT, it is known to be a SSA_NAME, so we + can simply compare pointers. */ if (lhs == t) continue; |