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tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction

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We can subtract from more small constants that just 0 with one insn,
and we can add the negative for most small constants.

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 16:44:18 -04:00
parent 8642088a3d
commit f940fb086c
1 changed files with 23 additions and 2 deletions
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25
tcg/ia64/tcg-target.c
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@ -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: