[Qemu-stable] [PATCH 84/99] target/arm: Implement FMOV (immediate) for fp16

[Michael Roth]

From: Alex Bennée <address@hidden>

All the hard work is already done by vfp_expand_imm, we just need to
make sure we pick up the correct size.

Cc: address@hidden
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Alex Bennée <address@hidden>
Tested-by: Alex Bennée <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
Message-id: address@hidden
[rth: Merge unallocated_encoding check with TCGMemOp conversion.]
Signed-off-by: Richard Henderson <address@hidden>
Signed-off-by: Peter Maydell <address@hidden>

(cherry picked from commit 6ba28ddb9be37bdb67e3e38007a53ccbdcd010df)
Signed-off-by: Michael Roth <address@hidden>
---
 target/arm/translate-a64.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 7075f27e05..f4587c3814 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -5431,11 +5431,25 @@ static void disas_fp_imm(DisasContext *s, uint32_t insn)
 {
     int rd = extract32(insn, 0, 5);
     int imm8 = extract32(insn, 13, 8);
-    int is_double = extract32(insn, 22, 2);
+    int type = extract32(insn, 22, 2);
     uint64_t imm;
     TCGv_i64 tcg_res;
+    TCGMemOp sz;
 
-    if (is_double > 1) {
+    switch (type) {
+    case 0:
+        sz = MO_32;
+        break;
+    case 1:
+        sz = MO_64;
+        break;
+    case 3:
+        sz = MO_16;
+        if (arm_dc_feature(s, ARM_FEATURE_V8_FP16)) {
+            break;
+        }
+        /* fallthru */
+    default:
         unallocated_encoding(s);
         return;
     }
@@ -5444,7 +5458,7 @@ static void disas_fp_imm(DisasContext *s, uint32_t insn)
         return;
     }
 
-    imm = vfp_expand_imm(MO_32 + is_double, imm8);
+    imm = vfp_expand_imm(sz, imm8);
 
     tcg_res = tcg_const_i64(imm);
     write_fp_dreg(s, rd, tcg_res);
-- 
2.17.1