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| author | Richard Henderson | 2013-09-05 22:44:18 +0200 |
|---|---|---|
| committer | Richard Henderson | 2013-11-18 06:57:33 +0100 |
| commit | f940fb086c607fcb9c98d5ce67619fc5255f6abb (patch) | |
| tree | 9395eb0576fa5a6764ae7274c10286625d5345a8 /tcg/ia64 | |
| parent | tcg-ia64: Use ADDS for small addition (diff) | |
| download | qemu-f940fb086c607fcb9c98d5ce67619fc5255f6abb.tar.gz qemu-f940fb086c607fcb9c98d5ce67619fc5255f6abb.tar.xz qemu-f940fb086c607fcb9c98d5ce67619fc5255f6abb.zip | |
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>
Diffstat (limited to 'tcg/ia64')
| -rw-r--r-- | tcg/ia64/tcg-target.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c index 8fb3ba04df..54232eb495 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: |