diff options
| author | Richard Henderson <rth@twiddle.net> | 2013-07-25 10:00:41 -1000 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2013-08-26 13:31:53 -0700 |
| commit | 8023ccda079624221e618efeb537b41c70407469 (patch) | |
| tree | 44e3208c8619c46b51b3ffd5128f3fe711e304dc /tcg/i386 | |
| parent | ac26eb69a311396668809eadbf7ff4e623447d4c (diff) | |
| download | qemu-8023ccda079624221e618efeb537b41c70407469.tar.gz | |
tcg-i386: Try pc-relative lea for constant formation
Use a 7 byte lea before the ultimate 10 byte movq.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg/i386')
| -rw-r--r-- | tcg/i386/tcg-target.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index 841bd750e4..82261713a8 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -541,19 +541,34 @@ static inline void tcg_out_mov(TCGContext *s, TCGType type, static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg ret, tcg_target_long arg) { + tcg_target_long diff; + if (arg == 0) { tgen_arithr(s, ARITH_XOR, ret, ret); return; - } else if (arg == (uint32_t)arg || type == TCG_TYPE_I32) { + } + if (arg == (uint32_t)arg || type == TCG_TYPE_I32) { tcg_out_opc(s, OPC_MOVL_Iv + LOWREGMASK(ret), 0, ret, 0); tcg_out32(s, arg); - } else if (arg == (int32_t)arg) { + return; + } + if (arg == (int32_t)arg) { tcg_out_modrm(s, OPC_MOVL_EvIz + P_REXW, 0, ret); tcg_out32(s, arg); - } else { - tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0); - tcg_out64(s, arg); + return; } + + /* Try a 7 byte pc-relative lea before the 10 byte movq. */ + diff = arg - ((tcg_target_long)s->code_ptr + 7); + if (diff == (int32_t)diff) { + tcg_out_opc(s, OPC_LEA | P_REXW, ret, 0, 0); + tcg_out8(s, (LOWREGMASK(ret) << 3) | 5); + tcg_out32(s, diff); + return; + } + + tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0); + tcg_out64(s, arg); } static inline void tcg_out_pushi(TCGContext *s, tcg_target_long val) |