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Randomize penalties for aborts and add blacklisting.

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This commit is contained in:
Mike Pall
2010-02-23 18:27:39 +01:00
parent d5c8fe4b90
commit 8ae2f9feaa
6 changed files with 50 additions and 23 deletions
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13
src/lj_jit.h
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@@ -69,14 +69,14 @@
_(\007, maxside, 100) /* Max. # of side traces of a root trace. */ \
_(\007, maxsnap, 100) /* Max. # of snapshots for a trace. */ \
\
_(\007, hotloop, 57) /* # of iterations to detect a hot loop. */ \
_(\007, hotloop, 56) /* # of iter. to detect a hot loop/call. */ \
_(\007, hotexit, 10) /* # of taken exits to start a side trace. */ \
_(\007, tryside, 4) /* # of attempts to compile a side trace. */ \
\
_(\012, instunroll, 4) /* Max. unroll for instable loops. */ \
_(\012, loopunroll, 7) /* Max. unroll for loop ops in side traces. */ \
_(\012, callunroll, 3) /* Max. unroll for recursive calls. */ \
_(\011, recunroll, 2) /* Max. unroll for true recursion. */ \
_(\011, recunroll, 2) /* Min. unroll for true recursion. */ \
\
/* Size of each machine code area (in KBytes). */ \
_(\011, sizemcode, JIT_P_sizemcode_DEFAULT) \
@@ -181,13 +181,15 @@ typedef struct Trace {
/* Round-robin penalty cache for bytecodes leading to aborted traces. */
typedef struct HotPenalty {
const BCIns *pc; /* Starting bytecode PC. */
MRef pc; /* Starting bytecode PC. */
uint16_t val; /* Penalty value, i.e. hotcount start. */
uint16_t reason; /* Abort reason (really TraceErr). */
} HotPenalty;
/* Number of slots for the penalty cache. Must be a power of 2. */
#define PENALTY_SLOTS 16
#define PENALTY_SLOTS 64 /* Penalty cache slot. Must be a power of 2. */
#define PENALTY_MIN 36 /* Minimum penalty value. */
#define PENALTY_MAX 60000 /* Maximum penalty value. */
#define PENALTY_RNDBITS 4 /* # of random bits to add to penalty value. */
/* Round-robin backpropagation cache for narrowing conversions. */
typedef struct BPropEntry {
@@ -264,6 +266,7 @@ typedef struct jit_State {
HotPenalty penalty[PENALTY_SLOTS]; /* Penalty slots. */
uint32_t penaltyslot; /* Round-robin index into penalty slots. */
uint32_t prngstate; /* PRNG state for penalty randomization. */
BPropEntry bpropcache[BPROP_SLOTS]; /* Backpropagation cache slots. */
uint32_t bpropslot; /* Round-robin index into bpropcache slots. */