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| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-10-24 22:11:40 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-10-24 22:11:40 +0000 |
| commit | 81098a4adbab4efb5666ae39f8e8a1acd699aefa (patch) | |
| tree | 9e551549baa1abd0812c74a8619b5f316aec7e28 | |
| parent | 96bea0aab4134247273eb3a0ce0ec99bd9ee0bf0 (diff) | |
| download | ppe42-gcc-81098a4adbab4efb5666ae39f8e8a1acd699aefa.tar.gz ppe42-gcc-81098a4adbab4efb5666ae39f8e8a1acd699aefa.zip | |
* stmt.c (expand_end_case): Index jumptables from zero for
suitably small values of minval.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@46478 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/stmt.c | 13 |
2 files changed, 17 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f704e4a6bbe..1dfc93937bf 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2001-10-24 Roger Sayle <roger@eyesopen.com> + + * stmt.c (expand_end_case): Index jumptables from zero for + suitably small values of minval. + 2001-10-24 Jakub Jelinek <jakub@redhat.com> * stor-layout.c (place_union_field): If any field was aligned with diff --git a/gcc/stmt.c b/gcc/stmt.c index 4943397d220..76fa4393ee5 100644 --- a/gcc/stmt.c +++ b/gcc/stmt.c @@ -5534,6 +5534,17 @@ expand_end_case (orig_index) table_label, default_label)) { index_type = thiscase->data.case_stmt.nominal_type; + + /* Index jumptables from zero for suitable values of + minval to avoid a subtraction. */ + if (! optimize_size + && compare_tree_int (minval, 0) > 0 + && compare_tree_int (minval, 3) < 0) + { + minval = integer_zero_node; + range = maxval; + } + if (! try_tablejump (index_type, index_expr, minval, range, table_label, default_label)) abort (); @@ -5541,7 +5552,7 @@ expand_end_case (orig_index) /* Get table of labels to jump to, in order of case index. */ - ncases = TREE_INT_CST_LOW (range) + 1; + ncases = tree_low_cst (range, 0) + 1; labelvec = (rtx *) alloca (ncases * sizeof (rtx)); memset ((char *) labelvec, 0, ncases * sizeof (rtx)); |
