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tcg-ia64: Handle constant calls 

Using only indirect calls results in 3 bundles (one to load the
descriptor address), and 4 stop bits.  By looking through the
descriptor to the constants, we can perform the call with 2
bundles and only 1 stop bit.

Acked-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-09-05 12:11:27 -04:00
parent 5f7b16877a
commit 6f65c780b9
1 changed files with 35 additions and 3 deletions
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38
tcg/ia64/tcg-target.c
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@ -226,6 +226,7 @@ enum {
OPC_BR_CALL_SPTK_MANY_B5 = 0x02100001000ull,
OPC_BR_RET_SPTK_MANY_B4 = 0x00108001100ull,
OPC_BRL_SPTK_MANY_X3 = 0x18000001000ull,
OPC_BRL_CALL_SPTK_MANY_X4 = 0x1a000001000ull,
OPC_CMP_LT_A6 = 0x18000000000ull,
OPC_CMP_LTU_A6 = 0x1a000000000ull,
OPC_CMP_EQ_A6 = 0x1c000000000ull,
@ -584,6 +585,8 @@ static inline uint64_t tcg_opc_l3(uint64_t imm)
return (imm & 0x07fffffffff00000ull) >> 18;
}
#define tcg_opc_l4 tcg_opc_l3
static inline uint64_t tcg_opc_m1(int qp, uint64_t opc, int r1, int r3)
{
return opc
@ -668,6 +671,15 @@ static inline uint64_t tcg_opc_x3(int qp, uint64_t opc, uint64_t imm)
| (qp & 0x3f);
}
static inline uint64_t tcg_opc_x4(int qp, uint64_t opc, int b1, uint64_t imm)
{
return opc
| ((imm & 0x0800000000000000ull) >> 23) /* i */
| ((imm & 0x00000000000fffffull) << 13) /* imm20b */
| ((b1 & 0x7) << 6)
| (qp & 0x3f);
}
/*
* Relocations
@ -893,7 +905,23 @@ static void tcg_out_br(TCGContext *s, int label_index)
}
}
static inline void tcg_out_call(TCGContext *s, TCGArg addr)
static inline void tcg_out_calli(TCGContext *s, uintptr_t addr)
{
/* Look through the function descriptor. */
uintptr_t disp, *desc = (uintptr_t *)addr;
tcg_out_bundle(s, mlx,
INSN_NOP_M,
tcg_opc_l2 (desc[1]),
tcg_opc_x2 (TCG_REG_P0, OPC_MOVL_X2, TCG_REG_R1, desc[1]));
disp = (desc[0] - (uintptr_t)s->code_ptr) >> 4;
tcg_out_bundle(s, mLX,
INSN_NOP_M,
tcg_opc_l4 (disp),
tcg_opc_x4 (TCG_REG_P0, OPC_BRL_CALL_SPTK_MANY_X4,
TCG_REG_B0, disp));
}
static inline void tcg_out_callr(TCGContext *s, TCGReg addr)
{
tcg_out_bundle(s, MmI,
tcg_opc_m1 (TCG_REG_P0, OPC_LD8_M1, TCG_REG_R2, addr),
@ -2004,7 +2032,11 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
tcg_out_br(s, args[0]);
break;
case INDEX_op_call:
tcg_out_call(s, args[0]);
if (likely(const_args[0])) {
tcg_out_calli(s, args[0]);
} else {
tcg_out_callr(s, args[0]);
}
break;
case INDEX_op_goto_tb:
tcg_out_goto_tb(s, args[0]);
@ -2257,7 +2289,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
static const TCGTargetOpDef ia64_op_defs[] = {
{ INDEX_op_br, { } },
{ INDEX_op_call, { "r" } },
{ INDEX_op_call, { "ri" } },
{ INDEX_op_exit_tb, { } },
{ INDEX_op_goto_tb, { } },