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| author | Aurelien Jarno <aurelien@aurel32.net> | 2010-03-05 22:48:03 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-03-13 11:44:53 +0100 |
| commit | a3f5054b1a215a140e40a408bc13208196fb3d5d (patch) | |
| tree | 4e2ae22ecc88175c00c45b0766efb9076c28a6fb /tcg/README | |
| parent | 4e17eae9f2ee49833698aae2753c5bb041510870 (diff) | |
| download | qemu-a3f5054b1a215a140e40a408bc13208196fb3d5d.zip qemu-a3f5054b1a215a140e40a408bc13208196fb3d5d.tar.gz qemu-a3f5054b1a215a140e40a408bc13208196fb3d5d.tar.bz2 | |
tcg: update README with const and pure helpers
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/README')
| -rw-r--r-- | tcg/README | 11 |
1 files changed, 7 insertions, 4 deletions
@@ -75,10 +75,13 @@ destroyed, but local temporaries and globals are preserved. * Helpers: Using the tcg_gen_helper_x_y it is possible to call any function -taking i32, i64 or pointer types. Before calling an helper, all -globals are stored at their canonical location and it is assumed that -the function can modify them. In the future, function modifiers will -be allowed to tell that the helper does not read or write some globals. +taking i32, i64 or pointer types. By default, before calling an helper, +all globals are stored at their canonical location and it is assumed +that the function can modify them. This can be overriden by the +TCG_CALL_CONST function modifier. By default, the helper is allowed to +modify the CPU state or raise an exception. This can be overriden by +the TCG_CALL_PURE function modifier, in which case the call to the +function is removed if the return value is not used. On some TCG targets (e.g. x86), several calling conventions are supported. |