Patchwork tcg: update README with const and pure helpers

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Submitter Aurelien Jarno
Date March 5, 2010, 9:49 p.m.
Message ID <1267825763-7372-1-git-send-email-aurelien@aurel32.net>
Download mbox | patch
Permalink /patch/47032/
State New
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Aurelien Jarno - March 5, 2010, 9:49 p.m.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/README |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

Patch

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.