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| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-07-30 06:45:24 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-07-30 06:45:24 -0400 |
| commit | 5eb94e4e8b3bb7cc7407b646d982ad99a192041a (patch) | |
| tree | a88e78478bc5d780e136b01370495367a8533974 /gcc/stmt.c | |
| parent | 790e949032a94bc90fc4fcf79b31c8c14850dcb1 (diff) | |
| download | gcc-5eb94e4e8b3bb7cc7407b646d982ad99a192041a.zip gcc-5eb94e4e8b3bb7cc7407b646d982ad99a192041a.tar.gz gcc-5eb94e4e8b3bb7cc7407b646d982ad99a192041a.tar.bz2 | |
(expand_return): Don't use jumps for "return x == y" if they are
expensive.
From-SVN: r5043
Diffstat (limited to 'gcc/stmt.c')
| -rw-r--r-- | gcc/stmt.c | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -1,5 +1,5 @@ /* Expands front end tree to back end RTL for GNU C-Compiler - Copyright (C) 1987, 1988, 1989, 1992 Free Software Foundation, Inc. + Copyright (C) 1987, 1988, 1989, 1992, 1993 Free Software Foundation, Inc. This file is part of GNU CC. @@ -2388,11 +2388,13 @@ expand_return (retval) because expand_null_return takes care of them, too. Any reason why not? */ if (HAVE_return && cleanup_label == 0 - && ! current_function_returns_pcc_struct) + && ! current_function_returns_pcc_struct + && BRANCH_COST <= 1) { /* If this is return x == y; then generate if (x == y) return 1; else return 0; - if we can do it with explicit return insns. */ + if we can do it with explicit return insns and + branches are cheap. */ if (retval_rhs) switch (TREE_CODE (retval_rhs)) { |