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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 /tcg/tcg.h
parentf293709c6af7a65a9bcec09cdba7a60183657a3e (diff)
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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.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/tcg/tcg.h b/tcg/tcg.h
index 5fbbd15..a696922 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -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. */