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| author | Richard Henderson <rth@twiddle.net> | 2010-05-21 08:30:34 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-05-21 16:20:23 +0000 |
| commit | 5d1e4e85cee8c735ae49599ba96440d29312557c (patch) | |
| tree | 739ec9fe4823a68aaf027d9b8b6cdb84a34a830c /tcg/i386 | |
| parent | 34a6d0b7fcac2faf936ab92803b4ac21f809a3b9 (diff) | |
| download | qemu-5d1e4e85cee8c735ae49599ba96440d29312557c.zip qemu-5d1e4e85cee8c735ae49599ba96440d29312557c.tar.gz qemu-5d1e4e85cee8c735ae49599ba96440d29312557c.tar.bz2 | |
tcg-i386: Use lea for three-operand add.
The result is shorter than the mov+add that TCG would
otherwise generate for us.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/i386')
| -rw-r--r-- | tcg/i386/tcg-target.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index 56800ff..abc4cdc 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -1165,6 +1165,25 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, case INDEX_op_st_i32: tcg_out_st(s, TCG_TYPE_I32, args[0], args[1], args[2]); break; + case INDEX_op_add_i32: + /* For 3-operand addition, use LEA. */ + if (args[0] != args[1]) { + TCGArg a0 = args[0], a1 = args[1], a2 = args[2], c3 = 0; + + if (const_args[2]) { + c3 = a2, a2 = -1; + } else if (a0 == a2) { + /* Watch out for dest = src + dest, since we've removed + the matching constraint on the add. */ + tgen_arithr(s, ARITH_ADD, a0, a1); + break; + } + + tcg_out_modrm_sib_offset(s, OPC_LEA, a0, a1, a2, 0, c3); + break; + } + c = ARITH_ADD; + goto gen_arith; case INDEX_op_sub_i32: c = ARITH_SUB; goto gen_arith; @@ -1177,8 +1196,6 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, case INDEX_op_xor_i32: c = ARITH_XOR; goto gen_arith; - case INDEX_op_add_i32: - c = ARITH_ADD; gen_arith: if (const_args[2]) { tgen_arithi(s, c, args[0], args[2], 0); @@ -1353,7 +1370,7 @@ static const TCGTargetOpDef x86_op_defs[] = { { INDEX_op_st16_i32, { "r", "r" } }, { INDEX_op_st_i32, { "r", "r" } }, - { INDEX_op_add_i32, { "r", "0", "ri" } }, + { INDEX_op_add_i32, { "r", "r", "ri" } }, { INDEX_op_sub_i32, { "r", "0", "ri" } }, { INDEX_op_mul_i32, { "r", "0", "ri" } }, { INDEX_op_mulu2_i32, { "a", "d", "a", "r" } }, |