From d8918df577c9e3f2281d24c6c29d37df12bff2da Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 11 Sep 2013 13:44:17 -0700 Subject: tcg-aarch64: Special case small constants in tcg_out_movi Reviewed-by: Claudio Fontana Signed-off-by: Richard Henderson --- tcg/aarch64/tcg-target.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'tcg/aarch64') 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. */ -- cgit v1.2.1