[Qemu-ppc] [PATCH 3/7] Add VSX Instruction Decoders

[Tom Musta]

This patch adds decoders for the VSX fields XT, XS, XA, XB and
DM.  The first four are split fields and a general helper for
these types of fields is also added.

Signed-off-by: Tom Musta <address@hidden>

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 21c272f..d80ed8a 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -370,6 +370,12 @@ static inline int32_t name(uint32_t 
opcode)                                   \
     return (int16_t)((opcode >> (shift)) & ((1 << (nb)) - 
1));                \
 }

+#define EXTRACT_HELPER_SPLIT(name, shift1, nb1, shift2, 
nb2)                  \
+static inline uint32_t name(uint32_t 
opcode)                                  \
+{ \
+    return (((opcode >> (shift1)) & ((1 << (nb1)) - 1)) << nb2) 
|             \
+            ((opcode >> (shift2)) & ((1 << (nb2)) - 
1));                      \
+}
 /* Opcode part 1 */
 EXTRACT_HELPER(opc1, 26, 6);
 /* Opcode part 2 */
@@ -484,6 +490,11 @@ static inline target_ulong MASK(uint32_t start, 
uint32_t end)
     return ret;
 }

+EXTRACT_HELPER_SPLIT(xT, 0, 1, 21, 5);
+EXTRACT_HELPER_SPLIT(xS, 0, 1, 21, 5);
+EXTRACT_HELPER_SPLIT(xA, 1, 1, 16, 5);
+EXTRACT_HELPER_SPLIT(xB, 2, 1, 11, 5);
+EXTRACT_HELPER(DM, 8, 2);
 /*****************************************************************************/
 /* PowerPC instructions 
table                                                */

--
1.7.1