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[Qemu-devel] [PATCH 08/20] tcg-ia64: Use SUB_A3 and ADDS_A4 for subtract
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 08/20] tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction |
Date: |
Thu, 31 Oct 2013 13:21:57 -0700 |
We can subtract from more small constants that just 0 with one insn,
and we can add the negative for most small constants.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/ia64/tcg-target.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c
index be74606..d7bccd2 100644
--- a/tcg/ia64/tcg-target.c
+++ b/tcg/ia64/tcg-target.c
@@ -1080,6 +1080,28 @@ static inline void tcg_out_add(TCGContext *s, TCGReg
ret, TCGReg arg1,
}
}
+static inline void tcg_out_sub(TCGContext *s, TCGReg ret, TCGArg arg1,
+ int const_arg1, TCGArg arg2, int const_arg2)
+{
+ if (const_arg1 && arg1 == (int8_t)arg1) {
+ if (const_arg2) {
+ tcg_out_movi(s, TCG_TYPE_I64, ret, arg1 - arg2);
+ return;
+ }
+ tcg_out_bundle(s, mmI,
+ INSN_NOP_M,
+ INSN_NOP_M,
+ tcg_opc_a3(TCG_REG_P0, OPC_SUB_A3, ret, arg1, arg2));
+ } else 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_SUB_A1, ret, arg1, const_arg1, arg2, const_arg2);
+ }
+}
+
static inline void tcg_out_eqv(TCGContext *s, TCGArg ret,
TCGArg arg1, int const_arg1,
TCGArg arg2, int const_arg2)
@@ -2085,8 +2107,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode
opc,
break;
case INDEX_op_sub_i32:
case INDEX_op_sub_i64:
- tcg_out_alu(s, OPC_SUB_A1, args[0], args[1], const_args[1],
- args[2], const_args[2]);
+ tcg_out_sub(s, args[0], args[1], const_args[1], args[2],
const_args[2]);
break;
case INDEX_op_and_i32:
--
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, 2013/10/31
- [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 <=
- [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
- [Qemu-devel] [PATCH 15/20] tcg-ia64: Move bswap for store into tlb load, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 16/20] tcg-ia64: Move tlb addend load into tlb read, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 17/20] tcg-ia64: Reduce code duplication in tcg_out_qemu_ld, Richard Henderson, 2013/10/31
- [Qemu-devel] [PATCH 18/20] tcg-ia64: Convert to new ldst helpers, Richard Henderson, 2013/10/31