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authoraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-06 12:33:59 +0000
committeraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-06 12:33:59 +0000
commitb9c18f56585ab146c6a25084bce00e4c52eefcc6 (patch)
tree20207c890dcc4976359e5e1e833fd48a70a6fc77 /tcg/tcg.h
parent34d5a9ff634b1cafdd164cfe19e167b55084f6b8 (diff)
downloadqemu-arm-b9c18f56585ab146c6a25084bce00e4c52eefcc6.tar.gz
tcg: add a CONST flag to TCG helpers
A const function only reads its arguments and does not use TCG globals variables. Hence a call to such a function does not save TCG globals variabes back to their canonical location. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7008 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'tcg/tcg.h')
-rw-r--r--tcg/tcg.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/tcg/tcg.h b/tcg/tcg.h
index cb4911cde6..c9b001e004 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -178,6 +178,10 @@ typedef int TCGv_i64;
and cannot raise exceptions. Hence a call to a pure function can be
safely suppressed if the return value is not used. */
#define TCG_CALL_PURE 0x0010
+/* A const function only reads its arguments and does not use TCG
+ globals variables. Hence a call to such a function does not
+ save TCG globals variabes back to their canonical location. */
+#define TCG_CALL_CONST 0x0020
/* used to align parameters */
#define TCG_CALL_DUMMY_TCGV MAKE_TCGV_I32(-1)