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authorRichard Henderson <rth@twiddle.net>2016-06-22 15:46:09 -0700
committerRichard Henderson <rth@twiddle.net>2016-08-05 21:44:17 +0530
commita1b3c48d2b23d6eaeb4529d3e1183d2648731bf8 (patch)
treef75c3f1d950980b386d721fa95183331773ca236 /tcg/tcg.h
parent51009170d8fc263cfdcd5a60fe3ba213daa3d15b (diff)
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tcg: Compress liveness data to 16 bits
This reduces both memory usage and per-insn cacheline usage during code generation. Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg/tcg.h')
-rw-r--r--tcg/tcg.h16
1 files changed, 10 insertions, 6 deletions
diff --git a/tcg/tcg.h b/tcg/tcg.h
index 6046dcd..7c0a138 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -575,6 +575,14 @@ typedef struct TCGTempSet {
unsigned long l[BITS_TO_LONGS(TCG_MAX_TEMPS)];
} TCGTempSet;
+/* While we limit helpers to 6 arguments, for 32-bit hosts, with padding,
+ this imples a max of 6*2 (64-bit in) + 2 (64-bit out) = 14 operands.
+ There are never more than 2 outputs, which means that we can store all
+ dead + sync data within 16 bits. */
+#define DEAD_ARG 4
+#define SYNC_ARG 1
+typedef uint16_t TCGLifeData;
+
typedef struct TCGOp {
TCGOpcode opc : 8;
@@ -608,12 +616,8 @@ struct TCGContext {
uintptr_t *tb_jmp_target_addr; /* tb->jmp_target_addr if !USE_DIRECT_JUMP */
/* liveness analysis */
- uint16_t *op_dead_args; /* for each operation, each bit tells if the
- corresponding argument is dead */
- uint8_t *op_sync_args; /* for each operation, each bit tells if the
- corresponding output argument needs to be
- sync to memory. */
-
+ TCGLifeData *op_arg_life;
+
TCGRegSet reserved_regs;
intptr_t current_frame_offset;
intptr_t frame_start;