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tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction
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>
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@ -1080,6 +1080,28 @@ static inline void tcg_out_add(TCGContext *s, TCGReg ret, TCGReg arg1,
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}
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}
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static inline void tcg_out_sub(TCGContext *s, TCGReg ret, TCGArg arg1,
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int const_arg1, TCGArg arg2, int const_arg2)
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{
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if (const_arg1 && arg1 == (int8_t)arg1) {
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if (const_arg2) {
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tcg_out_movi(s, TCG_TYPE_I64, ret, arg1 - arg2);
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return;
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}
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tcg_out_bundle(s, mmI,
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INSN_NOP_M,
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INSN_NOP_M,
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tcg_opc_a3(TCG_REG_P0, OPC_SUB_A3, ret, arg1, arg2));
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} else if (const_arg2 && -arg2 == sextract64(-arg2, 0, 14)) {
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tcg_out_bundle(s, mmI,
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INSN_NOP_M,
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INSN_NOP_M,
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tcg_opc_a4(TCG_REG_P0, OPC_ADDS_A4, ret, -arg2, arg1));
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} else {
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tcg_out_alu(s, OPC_SUB_A1, ret, arg1, const_arg1, arg2, const_arg2);
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}
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}
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static inline void tcg_out_eqv(TCGContext *s, TCGArg ret,
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TCGArg arg1, int const_arg1,
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TCGArg arg2, int const_arg2)
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@ -2085,8 +2107,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
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break;
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case INDEX_op_sub_i32:
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case INDEX_op_sub_i64:
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tcg_out_alu(s, OPC_SUB_A1, args[0], args[1], const_args[1],
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args[2], const_args[2]);
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tcg_out_sub(s, args[0], args[1], const_args[1], args[2], const_args[2]);
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break;
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case INDEX_op_and_i32:
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