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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 /tcg/tcg.h | |
| parent | f293709c6af7a65a9bcec09cdba7a60183657a3e (diff) | |
| download | qemu-b125f9dc7bd68cd4c57189db4da83b0620b28a72.zip qemu-b125f9dc7bd68cd4c57189db4da83b0620b28a72.tar.gz qemu-b125f9dc7bd68cd4c57189db4da83b0620b28a72.tar.bz2 | |
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 'tcg/tcg.h')
| -rw-r--r-- | tcg/tcg.h | 5 |
1 files changed, 3 insertions, 2 deletions
@@ -559,10 +559,11 @@ struct TCGContext { void *code_gen_prologue; void *code_gen_buffer; size_t code_gen_buffer_size; - /* threshold to flush the translated code buffer */ - size_t code_gen_buffer_max_size; void *code_gen_ptr; + /* Threshold to flush the translated code buffer. */ + void *code_gen_highwater; + TBContext tb_ctx; /* The TCGBackendData structure is private to tcg-target.c. */ |