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[Qemu-devel] [PATCH] tcg: update README with const and pure helpers
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH] tcg: update README with const and pure helpers |
Date: |
Fri, 5 Mar 2010 22:49:23 +0100 |
Signed-off-by: Aurelien Jarno <address@hidden>
---
tcg/README | 11 +++++++----
1 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/tcg/README b/tcg/README
index f0e21a1..281c114 100644
--- a/tcg/README
+++ b/tcg/README
@@ -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.
--
1.7.0
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