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tcg: Fold life data into TCGOp

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Reduce the size of other bitfields to make room.
This reduces the cache footprint of compilation.

Backports commit bee158cb4dde35c41632a3a129c869f14a32f8f0 from qemu
This commit is contained in:
Richard Henderson 2018-02-25 21:49:33 -05:00 committed by Lioncash
parent b5e765d562
commit 690985a582
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 20 additions and 22 deletions
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10
qemu/tcg/tcg.c
View file

@ -1401,11 +1401,7 @@ static inline void tcg_la_br_end(TCGContext *s, uint8_t *mem_temps)
static void tcg_liveness_analysis(TCGContext *s)
{
uint8_t *dead_temps, *mem_temps;
int oi, oi_prev, nb_ops;
nb_ops = s->gen_next_op_idx;
s->op_arg_life = tcg_malloc(s, nb_ops * sizeof(TCGLifeData));
int oi, oi_prev;
dead_temps = tcg_malloc(s, s->nb_temps);
mem_temps = tcg_malloc(s, s->nb_temps);
@ -1632,7 +1628,7 @@ static void tcg_liveness_analysis(TCGContext *s)
}
break;
}
s->op_arg_life[oi] = arg_life;
op->life = arg_life;
}
}
#else
@ -2457,7 +2453,7 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb)
TCGArg * const args = &s->gen_opparam_buf[op->args];
TCGOpcode opc = op->opc;
const TCGOpDef *def = &s->tcg_op_defs[opc];
TCGLifeData arg_life = s->op_arg_life[oi];
TCGLifeData arg_life = op->life;
oi_next = op->next;
#ifdef CONFIG_PROFILER

32
qemu/tcg/tcg.h
View file

@ -585,25 +585,30 @@ typedef struct TCGTempSet {
#define SYNC_ARG 1
typedef uint16_t TCGLifeData;
/* The layout here is designed to avoid crossing of a 32-bit boundary.
If we do so, gcc adds padding, expanding the size to 12. */
typedef struct TCGOp {
TCGOpcode opc : 8;
/* The number of out and in parameter for a call. */
unsigned callo : 2;
unsigned calli : 6;
/* Index of the arguments for this op, or 0 for zero-operand ops. */
unsigned args : 16;
TCGOpcode opc : 8; /* 8 */
/* Index of the prev/next op, or 0 for the end of the list. */
unsigned prev : 16;
unsigned next : 16;
unsigned prev : 10; /* 18 */
unsigned next : 10; /* 28 */
/* The number of out and in parameter for a call. */
unsigned calli : 4; /* 32 */
unsigned callo : 2; /* 34 */
/* Index of the arguments for this op, or 0 for zero-operand ops. */
unsigned args : 14; /* 48 */
/* Lifetime data of the operands. */
unsigned life : 16; /* 64 */
} TCGOp;
/* Make sure operands fit in the bitfields above. */
QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8));
QEMU_BUILD_BUG_ON(OPC_BUF_SIZE > (1 << 16));
QEMU_BUILD_BUG_ON(OPPARAM_BUF_SIZE > (1 << 16));
QEMU_BUILD_BUG_ON(OPC_BUF_SIZE > (1 << 10));
QEMU_BUILD_BUG_ON(OPPARAM_BUF_SIZE > (1 << 14));
/* Make sure that we don't overflow 64 bits without noticing. */
QEMU_BUILD_BUG_ON(sizeof(TCGOp) > 8);
@ -746,9 +751,6 @@ struct TCGContext {
uint16_t *tb_jmp_insn_offset; /* tb->jmp_insn_offset if USE_DIRECT_JUMP */
uintptr_t *tb_jmp_target_addr; /* tb->jmp_target_addr if !USE_DIRECT_JUMP */
/* liveness analysis */
TCGLifeData *op_arg_life;
TCGRegSet reserved_regs;
intptr_t current_frame_offset;
intptr_t frame_start;