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| author | Qing Zhao <qing.zhao@oracle.com> | 2017-11-17 05:32:05 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2017-11-16 22:32:05 -0700 |
| commit | caed5c92712701509413c579fb004faa965e4004 (patch) | |
| tree | e6a25de7a4c912e87fdd28ec9a45b3cfc6aa2388 /gcc/gimple-fold.c | |
| parent | 5958557b750254f28954d1ed6a3ce0b9cb48c6fb (diff) | |
| download | gcc-caed5c92712701509413c579fb004faa965e4004.zip gcc-caed5c92712701509413c579fb004faa965e4004.tar.gz gcc-caed5c92712701509413c579fb004faa965e4004.tar.bz2 | |
re PR middle-end/78809 (Inline strcmp with small constant strings)
2017-11-15 Qing Zhao <qing.zhao@oracle.com>
PR middle-end/78809
* gimple-fold.c (gimple_fold_builtin_string_compare): Add handling
of replacing call to strncmp with corresponding call to strcmp when
meeting conditions.
PR middle-end/78809
* gcc.dg/strcmpopt_1.c: New test.
From-SVN: r254856
Diffstat (limited to 'gcc/gimple-fold.c')
| -rw-r--r-- | gcc/gimple-fold.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c index adb6f3b..1ed6383 100644 --- a/gcc/gimple-fold.c +++ b/gcc/gimple-fold.c @@ -2258,6 +2258,21 @@ gimple_fold_builtin_string_compare (gimple_stmt_iterator *gsi) return true; } + /* If length is larger than the length of one constant string, + replace strncmp with corresponding strcmp */ + if (fcode == BUILT_IN_STRNCMP + && length > 0 + && ((p2 && (size_t) length > strlen (p2)) + || (p1 && (size_t) length > strlen (p1)))) + { + tree fn = builtin_decl_implicit (BUILT_IN_STRCMP); + if (!fn) + return false; + gimple *repl = gimple_build_call (fn, 2, str1, str2); + replace_call_with_call_and_fold (gsi, repl); + return true; + } + return false; } |