added 'pure' function attribute - fixed indirect function calls

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4469 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 4 insertions, 0 deletions

diff --git a/tcg/tcg.h b/tcg/tcg.h
index 66bbe73a4a..1b8546729f 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -148,6 +148,10 @@ typedef int TCGv;
 #define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */
 #define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */
 #define TCG_CALL_TYPE_REGPARM   0x0003 /* i386 style regparm call (3 regs) */
+/* A pure function only reads its arguments and globals variables 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 
 
 typedef enum {
     TCG_COND_EQ,