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| author | Richard Henderson <rth@twiddle.net> | 2015-09-22 13:01:15 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2015-10-07 20:36:53 +1100 |
| commit | b125f9dc7bd68cd4c57189db4da83b0620b28a72 (patch) | |
| tree | 8d2b7a06e64121738343a3abebb5070b64f4ff21 /include/exec/exec-all.h | |
| parent | f293709c6af7a65a9bcec09cdba7a60183657a3e (diff) | |
| download | qemu-b125f9dc7bd68cd4c57189db4da83b0620b28a72.zip | |
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/exec/exec-all.h')
| -rw-r--r-- | include/exec/exec-all.h | 6 |
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" |