diff options
| author | Richard Henderson <rth@twiddle.net> | 2013-09-11 13:44:17 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@redhat.com> | 2014-04-16 12:12:58 -0400 |
| commit | d8918df577c9e3f2281d24c6c29d37df12bff2da (patch) | |
| tree | 29f6124199ff595123b7d56a5c7386e466192be3 /tcg/aarch64 | |
| parent | 4ec4f0bd564f79a7144fcaca59515a9c6cfc4577 (diff) | |
| download | qemu-d8918df577c9e3f2281d24c6c29d37df12bff2da.tar.gz | |
tcg-aarch64: Special case small constants in tcg_out_movi
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg/aarch64')
| -rw-r--r-- | tcg/aarch64/tcg-target.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c index c1d989571f..a08f6c782b 100644 --- a/tcg/aarch64/tcg-target.c +++ b/tcg/aarch64/tcg-target.c @@ -578,6 +578,16 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd, type = TCG_TYPE_I32; } + /* Speed things up by handling the common case of small positive + and negative values specially. */ + if ((value & ~0xffffull) == 0) { + tcg_out_insn(s, 3405, MOVZ, type, rd, value, 0); + return; + } else if ((ivalue & ~0xffffull) == 0) { + tcg_out_insn(s, 3405, MOVN, type, rd, ivalue, 0); + return; + } + /* Check for bitfield immediates. For the benefit of 32-bit quantities, use the sign-extended value. That lets us match rotated values such as 0xff0000ff with the same 64-bit logic matching 0xffffffffff0000ff. */ |