Reviewed-by: Claudio Fontana <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
---
tcg/aarch64/tcg-target.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c
index c1d9895..a08f6c7 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. */
--
1.9.0
