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-rw-r--r--tcg/README19
1 files changed, 14 insertions, 5 deletions
diff --git a/tcg/README b/tcg/README
index 9d1b100613..ec1ac79375 100644
--- a/tcg/README
+++ b/tcg/README
@@ -77,11 +77,20 @@ destroyed, but local temporaries and globals are preserved.
Using the tcg_gen_helper_x_y it is possible to call any function
taking i32, i64 or pointer types. By default, before calling a helper,
all globals are stored at their canonical location and it is assumed
-that the function can modify them. This can be overridden 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 overridden by
-the TCG_CALL_PURE function modifier, in which case the call to the
-function is removed if the return value is not used.
+that the function can modify them. By default, the helper is allowed to
+modify the CPU state or raise an exception.
+
+This can be overridden using the following function modifiers:
+- TCG_CALL_NO_READ_GLOBALS means that the helper does not read globals,
+ either directly or via an exception. They will not be saved to their
+ canonical locations before calling the helper.
+- TCG_CALL_NO_WRITE_GLOBALS means that the helper does not modify any globals.
+ They will only be saved to their canonical location before calling helpers,
+ but they won't be reloaded afterwise.
+- TCG_CALL_NO_SIDE_EFFECTS means that the call to the function is removed if
+ the return value is not used.
+
+Note that TCG_CALL_NO_READ_GLOBALS implies TCG_CALL_NO_WRITE_GLOBALS.
On some TCG targets (e.g. x86), several calling conventions are
supported.