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[Qemu-devel] [PATCH 07/19] tcg-ia64: Use ADDS for small addition
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 07/19] tcg-ia64: Use ADDS for small addition |
Date: |
Thu, 5 Sep 2013 23:50:29 -0700 |
Avoids a wasted cycle loading up small constants.
Simplify the code assuming the tcg optimizer is going to work
and don't expect the first operand of the add to be constant.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/ia64/tcg-target.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c
index f0c5e0b..1659421 100644
--- a/tcg/ia64/tcg-target.c
+++ b/tcg/ia64/tcg-target.c
@@ -1065,6 +1065,19 @@ static void tcg_out_alu(TCGContext *s, uint64_t opc_a1,
TCGReg ret, TCGArg arg1,
tcg_opc_a1(TCG_REG_P0, opc_a1, ret, arg1, arg2));
}
+static inline void tcg_out_add(TCGContext *s, TCGReg ret, TCGReg arg1,
+ TCGArg arg2, int const_arg2)
+{
+ if (const_arg2 && arg2 == sextract64(arg2, 0, 14)) {
+ tcg_out_bundle(s, mmI,
+ INSN_NOP_M,
+ INSN_NOP_M,
+ tcg_opc_a4(TCG_REG_P0, OPC_ADDS_A4, ret, arg2, arg1));
+ } else {
+ tcg_out_alu(s, OPC_ADD_A1, ret, arg1, 0, arg2, const_arg2);
+ }
+}
+
static inline void tcg_out_eqv(TCGContext *s, TCGArg ret,
TCGArg arg1, int const_arg1,
TCGArg arg2, int const_arg2)
@@ -2066,8 +2079,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode
opc,
case INDEX_op_add_i32:
case INDEX_op_add_i64:
- tcg_out_alu(s, OPC_ADD_A1, args[0], args[1], const_args[1],
- args[2], const_args[2]);
+ tcg_out_add(s, args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_sub_i32:
case INDEX_op_sub_i64:
@@ -2273,7 +2285,7 @@ static const TCGTargetOpDef ia64_op_defs[] = {
{ INDEX_op_st16_i32, { "rZ", "r" } },
{ INDEX_op_st_i32, { "rZ", "r" } },
- { INDEX_op_add_i32, { "r", "rI", "rI" } },
+ { INDEX_op_add_i32, { "r", "rZ", "rI" } },
{ INDEX_op_sub_i32, { "r", "rI", "rI" } },
{ INDEX_op_and_i32, { "r", "rI", "rI" } },
@@ -2320,7 +2332,7 @@ static const TCGTargetOpDef ia64_op_defs[] = {
{ INDEX_op_st32_i64, { "rZ", "r" } },
{ INDEX_op_st_i64, { "rZ", "r" } },
- { INDEX_op_add_i64, { "r", "rI", "rI" } },
+ { INDEX_op_add_i64, { "r", "rZ", "rI" } },
{ INDEX_op_sub_i64, { "r", "rI", "rI" } },
{ INDEX_op_and_i64, { "r", "rI", "rI" } },
--
1.8.3.1
- [Qemu-devel] [PATCH 00/19] tcg-ia64 fixes and improvements, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 01/19] tcg-ia64: Use TCGMemOp within qemu_ldst routines, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 02/19] tcg-ia64: Use shortcuts for nop insns, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 04/19] tcg-ia64: Simplify brcond, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 03/19] tcg-ia64: Handle constant calls, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 05/19] tcg-ia64: Move AREG0 to R32, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 06/19] tcg-ia64: Avoid unnecessary stop bit in tcg_out_alu, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 08/19] tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 07/19] tcg-ia64: Use ADDS for small addition,
Richard Henderson <=
- [Qemu-devel] [PATCH 09/19] tcg-ia64: Use A3 form of logical operations, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 10/19] tcg-ia64 Introduce tcg_opc_mov_a, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 11/19] tcg-ia64 Introduce tcg_opc_movi_a, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 12/19] tcg-ia64 Introduce tcg_opc_ext_i, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 13/19] tcg-ia64 Introduce tcg_opc_bswap64_i, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 14/19] tcg-ia64: Re-bundle the tlb load, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 15/19] tcg-ia64: Move bswap for store into tlb load, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 16/19] tcg-ia64: Move tlb addend load into tlb read, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 17/19] tcg-i64: Reduce code duplication in tcg_out_qemu_ld, Richard Henderson, 2013/09/06
- [Qemu-devel] [PATCH 18/19] tcg-ia64: Convert to new ldst helpers, Richard Henderson, 2013/09/06