diff options
| author | Richard Henderson <rth@twiddle.net> | 2010-04-14 08:06:00 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-05-20 21:15:09 +0200 |
| commit | a042ef9470e1111bd5f5f84def886040345baabc (patch) | |
| tree | ad3fd4110a4318db481dcc7ad88c4ad9da19fa5d /tcg | |
| parent | af2660894f1d71cd8c9edeb19230f0336e320bcd (diff) | |
tcg-i386: Eliminate extra move from qemu_ld64.
If the address register overlaps one of the output registers
simply issue the clobbering load last, rather than emitting
an extra move of the address register.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/i386/tcg-target.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index 4b88138390..11e3661170 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -744,22 +744,20 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, } break; case 3: - /* XXX: could be nicer */ - if (r0 == data_reg) { - r1 = TCG_REG_EDX; - if (r1 == data_reg) - r1 = TCG_REG_EAX; - tcg_out_mov(s, r1, r0); - r0 = r1; + if (bswap) { + int t = data_reg; + data_reg = data_reg2; + data_reg2 = t; } - if (!bswap) { + if (r0 != data_reg) { tcg_out_ld(s, TCG_TYPE_I32, data_reg, r0, GUEST_BASE); tcg_out_ld(s, TCG_TYPE_I32, data_reg2, r0, GUEST_BASE + 4); } else { - tcg_out_ld(s, TCG_TYPE_I32, data_reg, r0, GUEST_BASE + 4); + tcg_out_ld(s, TCG_TYPE_I32, data_reg2, r0, GUEST_BASE + 4); + tcg_out_ld(s, TCG_TYPE_I32, data_reg, r0, GUEST_BASE); + } + if (bswap) { tcg_out_bswap32(s, data_reg); - - tcg_out_ld(s, TCG_TYPE_I32, data_reg2, r0, GUEST_BASE); tcg_out_bswap32(s, data_reg2); } break; |