diff options
| author | Richard Henderson <rth@twiddle.net> | 2012-10-02 11:32:30 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2012-10-17 17:51:39 +0200 |
| commit | 1414968a6aecd23cb037bc9e718d6f05ead2afaf (patch) | |
| tree | 4dc9f46337e135d3bece03959b6cb3bdc0e8d921 /tcg/tcg-op.h | |
| parent | 1305c451e67e3def030720013415103f5e0f5e11 (diff) | |
tcg: Optimize mulu2
Like add2, do operand ordering, constant folding, and dead operand
elimination. The latter happens about 15% of all mulu2 during an
x86_64 bios boot.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/tcg-op.h')
| -rw-r--r-- | tcg/tcg-op.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h index a580cfea07..8100a5a2e0 100644 --- a/tcg/tcg-op.h +++ b/tcg/tcg-op.h @@ -1027,6 +1027,8 @@ static inline void tcg_gen_mul_i64(TCGv_i64 ret, TCGv_i64 arg1, TCGv_i64 arg2) tcg_gen_op4_i32(INDEX_op_mulu2_i32, TCGV_LOW(t0), TCGV_HIGH(t0), TCGV_LOW(arg1), TCGV_LOW(arg2)); + /* Allow the optimizer room to replace mulu2 with two moves. */ + tcg_gen_op0(INDEX_op_nop); tcg_gen_mul_i32(t1, TCGV_LOW(arg1), TCGV_HIGH(arg2)); tcg_gen_add_i32(TCGV_HIGH(t0), TCGV_HIGH(t0), t1); |