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[Qemu-devel] [PATCH 03/20] tcg-ia64: Handle constant calls
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 03/20] tcg-ia64: Handle constant calls |
Date: |
Thu, 31 Oct 2013 13:21:52 -0700 |
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.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/ia64/tcg-target.c | 38 +++++++++++++++++++++++++++++++++++---
1 file changed, 35 insertions(+), 3 deletions(-)
diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c
index e1b8b7d..b19e298 100644
--- a/tcg/ia64/tcg-target.c
+++ b/tcg/ia64/tcg-target.c
@@ -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, { } },
--
1.8.3.1
- [Qemu-devel] [PATCH 00/20] tcg improvements for ia64, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 02/20] tcg-ia64: Use shortcuts for nop insns, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 01/20] tcg-ia64: Use TCGMemOp within qemu_ldst routines, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 04/20] tcg-ia64: Simplify brcond, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 03/20] tcg-ia64: Handle constant calls,
Richard Henderson <=
- [Qemu-devel] [PATCH 05/20] tcg-ia64: Move AREG0 to R32, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 06/20] tcg-ia64: Avoid unnecessary stop bit in tcg_out_alu, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 07/20] tcg-ia64: Use ADDS for small addition, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 08/20] tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 09/20] tcg-ia64: Use A3 form of logical operations, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 10/20] tcg-ia64: Introduce tcg_opc_mov_a, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 11/20] tcg-ia64: Introduce tcg_opc_movi_a, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 13/20] tcg-ia64: Introduce tcg_opc_bswap64_i, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 12/20] tcg-ia64: Introduce tcg_opc_ext_i, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 14/20] tcg-ia64: Re-bundle the tlb load, Richard Henderson, 2013/10/31