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| author | Martin Liska <mliska@suse.cz> | 2019-03-08 13:55:40 +0100 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2019-03-08 12:55:40 +0000 |
| commit | f62d3527db908646a518b1c1412210a3ae645d73 (patch) | |
| tree | 16e103fca2fc710abd5a1175fc1eb25d30a96576 /gcc/config/i386 | |
| parent | 37555926fe70c828675b5d3e165cb291b283a978 (diff) | |
| download | gcc-f62d3527db908646a518b1c1412210a3ae645d73.tar.gz | |
x86: Disable jump tables when retpolines are used (PR target/86952).
2019-03-08 Martin Liska <mliska@suse.cz>
PR target/86952
* config/i386/i386.c (ix86_option_override_internal): Disable
jump tables when retpolines are used.
2019-03-08 Martin Liska <mliska@suse.cz>
PR target/86952
* gcc.target/i386/pr86952.c: New test.
* gcc.target/i386/indirect-thunk-7.c: Use jump tables to match
scanned pattern.
* gcc.target/i386/indirect-thunk-inline-7.c: Likewise.
From-SVN: r269492
Diffstat (limited to 'gcc/config/i386')
| -rw-r--r-- | gcc/config/i386/i386.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 2d6a993238b..319caeda7b5 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -4894,6 +4894,12 @@ ix86_option_override_internal (bool main_args_p, opts->x_param_values, opts_set->x_param_values); + /* PR86952: jump table usage with retpolines is slow. + The PR provides some numbers about the slowness. */ + if (ix86_indirect_branch != indirect_branch_keep + && !opts_set->x_flag_jump_tables) + opts->x_flag_jump_tables = 0; + return true; } |