Signed-off-by: Richard Henderson <r...@twiddle.net>
---
tcg/aarch64/tcg-target.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c
index 9effee7..e50abcb 100644
--- a/tcg/aarch64/tcg-target.c
+++ b/tcg/aarch64/tcg-target.c
@@ -573,6 +573,17 @@ 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_fmt_Rd_uimm(s, INSN_MOVZ, type, rd, value, 0);
+ return;
+ }
+ if ((~svalue & ~0xffffull) == 0) {
+ tcg_fmt_Rd_uimm(s, INSN_MOVN, type, rd, ~svalue, 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.
--
1.8.3.1
