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authorRichard Henderson <rth@twiddle.net>2015-09-22 13:01:15 -0700
committerRichard Henderson <rth@twiddle.net>2015-10-07 20:36:53 +1100
commitb125f9dc7bd68cd4c57189db4da83b0620b28a72 (patch)
tree8d2b7a06e64121738343a3abebb5070b64f4ff21 /include
parentf293709c6af7a65a9bcec09cdba7a60183657a3e (diff)
tcg: Check for overflow via highwater mark
We currently pre-compute an worst case code size for any TB, which works out to be 122kB. Since the average TB size is near 1kB, this wastes quite a lot of storage. Instead, check for overflow in between generating code for each opcode. The overhead of the check isn't measurable and wastage is minimized. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'include')
-rw-r--r--include/exec/exec-all.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 6871e782b3..71c9d85278 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -62,12 +62,6 @@ typedef struct TranslationBlock TranslationBlock;
#define OPC_BUF_SIZE 640
#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 register reloads.
- For now take a wild guess at 192 bytes, which should allow at least
- a couple of fixup instructions per argument. */
-#define TCG_MAX_OP_SIZE 192
-
#define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM)
#include "qemu/log.h"