diff mbox series

[v2,01/14] target/arm: Implement vector shifted SCVF/UCVF for fp16

Message ID 20180502221552.3873-2-richard.henderson@linaro.org
State New
Headers show
Series target/arm: Fixups for ARM_FEATURE_V8_FP16 | expand

Commit Message

Richard Henderson May 2, 2018, 10:15 p.m. UTC 
While we have some of the scalar paths for *CVF for fp16,
we failed to decode the fp16 version of these instructions.

Cc: qemu-stable@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>


---
v2: Use parens with (x << y) >> z.
---
 target/arm/translate-a64.c | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

-- 
2.14.3

Comments

Peter Maydell May 10, 2018, 4:03 p.m. UTC | #1 
On 2 May 2018 at 23:15, Richard Henderson <richard.henderson@linaro.org> wrote:
> While we have some of the scalar paths for *CVF for fp16,

> we failed to decode the fp16 version of these instructions.

>

> Cc: qemu-stable@nongnu.org

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

>

> ---


Reviewed-by: Peter Maydell <peter.maydell@linaro.org>


thanks
-- PMM
diff mbox series

Patch

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index bff4e13bf6..68ca445691 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -7165,13 +7165,26 @@  static void handle_simd_shift_intfp_conv(DisasContext *s, bool is_scalar,
                                          int immh, int immb, int opcode,
                                          int rn, int rd)
 {
-    bool is_double = extract32(immh, 3, 1);
-    int size = is_double ? MO_64 : MO_32;
-    int elements;
+    int size, elements, fracbits;
     int immhb = immh << 3 | immb;
-    int fracbits = (is_double ? 128 : 64) - immhb;
 
-    if (!extract32(immh, 2, 2)) {
+    if (immh & 8) {
+        size = MO_64;
+        if (!is_scalar && !is_q) {
+            unallocated_encoding(s);
+            return;
+        }
+    } else if (immh & 4) {
+        size = MO_32;
+    } else if (immh & 2) {
+        size = MO_16;
+        if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) {
+            unallocated_encoding(s);
+            return;
+        }
+    } else {
+        /* immh == 0 would be a failure of the decode logic */
+        g_assert(immh == 1);
         unallocated_encoding(s);
         return;
     }
@@ -7179,20 +7192,14 @@  static void handle_simd_shift_intfp_conv(DisasContext *s, bool is_scalar,
     if (is_scalar) {
         elements = 1;
     } else {
-        elements = is_double ? 2 : is_q ? 4 : 2;
-        if (is_double && !is_q) {
-            unallocated_encoding(s);
-            return;
-        }
+        elements = (8 << is_q) >> size;
     }
+    fracbits = (16 << size) - immhb;
 
     if (!fp_access_check(s)) {
         return;
     }
 
-    /* immh == 0 would be a failure of the decode logic */
-    g_assert(immh);
-
     handle_simd_intfp_conv(s, rd, rn, elements, !is_u, fracbits, size);
 }