[Qemu-devel] [PULL 13/16] tcg/aarch64: Use MVNI in tcg_out_dupi_vec

[Richard Henderson]

The compliment of a subset of immediates can be computed
with a single instruction.

Signed-off-by: Richard Henderson <address@hidden>
---
 tcg/aarch64/tcg-target.inc.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c
index 1422dfebe2..0b8b733805 100644
--- a/tcg/aarch64/tcg-target.inc.c
+++ b/tcg/aarch64/tcg-target.inc.c
@@ -494,6 +494,7 @@ typedef enum {
 
     /* AdvSIMD modified immediate */
     I3606_MOVI      = 0x0f000400,
+    I3606_MVNI      = 0x2f000400,
 
     /* AdvSIMD shift by immediate */
     I3614_SSHR      = 0x0f000400,
@@ -838,8 +839,13 @@ static void tcg_out_dupi_vec(TCGContext *s, TCGType type,
             tcg_out_insn(s, 3606, MOVI, q, rd, 0, cmode, imm8);
             return;
         }
+        if (is_shimm16(~v16, &cmode, &imm8)) {
+            tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
+            return;
+        }
     } else if (v64 == dup_const(MO_32, v64)) {
         uint32_t v32 = v64;
+        uint32_t n32 = ~v32;
 
         if (is_shimm32(v32, &cmode, &imm8) ||
             is_soimm32(v32, &cmode, &imm8) ||
@@ -847,6 +853,11 @@ static void tcg_out_dupi_vec(TCGContext *s, TCGType type,
             tcg_out_insn(s, 3606, MOVI, q, rd, 0, cmode, imm8);
             return;
         }
+        if (is_shimm32(n32, &cmode, &imm8) ||
+            is_soimm32(n32, &cmode, &imm8)) {
+            tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
+            return;
+        }
     } else if (is_fimm64(v64, &cmode, &imm8)) {
         tcg_out_insn(s, 3606, MOVI, q, rd, 1, cmode, imm8);
         return;
-- 
2.17.1