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| author | Tom Wood <wood@gnu.org> | 1992-06-25 10:31:01 +0000 |
|---|---|---|
| committer | Tom Wood <wood@gnu.org> | 1992-06-25 10:31:01 +0000 |
| commit | cc61d0dec451a7a3bd0756a0894981be4c07d790 (patch) | |
| tree | a09521aba100016530c4ad770919354e8c95f7aa | |
| parent | e5671f2b6ef5a998cefe72b889dffaac288e6379 (diff) | |
| download | gcc-cc61d0dec451a7a3bd0756a0894981be4c07d790.zip gcc-cc61d0dec451a7a3bd0756a0894981be4c07d790.tar.gz gcc-cc61d0dec451a7a3bd0756a0894981be4c07d790.tar.bz2 | |
(CASE_VALUES_THRESHOLD): Define.
From-SVN: r1282
| -rw-r--r-- | gcc/config/m88k/m88k.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/config/m88k/m88k.h b/gcc/config/m88k/m88k.h index 98499cb..34873c4 100644 --- a/gcc/config/m88k/m88k.h +++ b/gcc/config/m88k/m88k.h @@ -1404,6 +1404,15 @@ enum reg_class { NO_REGS, AP_REG, XRF_REGS, GENERAL_REGS, AGRF_REGS, actually ignored by the `case' insn proper. */ /* #define CASE_DROPS_THROUGH */ +/* Define this to be the smallest number of different values for which it + is best to use a jump-table instead of a tree of conditional branches. + The default is 4 for machines with a casesi instruction and 5 otherwise. + The best 88110 number is around 7, though the exact number isn't yet + known. A third alternative for the 88110 is to use a binary tree of + bb1 instructions on bits 2/1/0 if the range is dense. This may not + win very much though. */ +#define CASE_VALUES_THRESHOLD (TARGET_88100 ? 4 : 7) + /* Specify the tree operation to be used to convert reals to integers. */ #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR |