TCG op size estimation fix.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4154 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 6 insertions, 0 deletions

diff --git a/exec-all.h b/exec-all.h
index 62b8191913..898cf687c2 100644
--- a/exec-all.h
+++ b/exec-all.h
@@ -36,6 +36,12 @@ struct TranslationBlock;
 #define OPC_BUF_SIZE 512
 #define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR)
 
+/* Maximum size a TCG op can expand to.  This is complicated because a
+   single op may require several host instructions and regirster reloads.
+   For now take a wild guess at 128 bytes, which should allow at least
+   a couple of fixup instructions per argument.  */
+#define TCG_MAX_OP_SIZE 128
+
 #define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM)
 
 extern target_ulong gen_opc_pc[OPC_BUF_SIZE];