target/arm: Move endian adjustment macros to vec_internal.h

We have two copies of these, one set of which is not complete.
Move them to a common header.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525010358.152808-82-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 24 insertions, 28 deletions

diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c
index 4afb06fb2a..40af3024df 100644
--- a/target/arm/sve_helper.c
+++ b/target/arm/sve_helper.c
@@ -29,22 +29,6 @@
 #include "vec_internal.h"
 
 
-/* Note that vector data is stored in host-endian 64-bit chunks,
-   so addressing units smaller than that needs a host-endian fixup.  */
-#ifdef HOST_WORDS_BIGENDIAN
-#define H1(x)   ((x) ^ 7)
-#define H1_2(x) ((x) ^ 6)
-#define H1_4(x) ((x) ^ 4)
-#define H2(x)   ((x) ^ 3)
-#define H4(x)   ((x) ^ 1)
-#else
-#define H1(x)   (x)
-#define H1_2(x) (x)
-#define H1_4(x) (x)
-#define H2(x)   (x)
-#define H4(x)   (x)
-#endif
-
 /* Return a value for NZCV as per the ARM PredTest pseudofunction.
  *
  * The return value has bit 31 set if N is set, bit 1 set if Z is clear,
diff --git a/target/arm/vec_helper.c b/target/arm/vec_helper.c
index 21ae1258f2..f5af45375d 100644
--- a/target/arm/vec_helper.c
+++ b/target/arm/vec_helper.c
@@ -25,18 +25,6 @@
 #include "qemu/int128.h"
 #include "vec_internal.h"
 
-/* Note that vector data is stored in host-endian 64-bit chunks,
-   so addressing units smaller than that needs a host-endian fixup.  */
-#ifdef HOST_WORDS_BIGENDIAN
-#define H1(x)  ((x) ^ 7)
-#define H2(x)  ((x) ^ 3)
-#define H4(x)  ((x) ^ 1)
-#else
-#define H1(x)  (x)
-#define H2(x)  (x)
-#define H4(x)  (x)
-#endif
-
 /* Signed saturating rounding doubling multiply-accumulate high half, 8-bit */
 int8_t do_sqrdmlah_b(int8_t src1, int8_t src2, int8_t src3,
                      bool neg, bool round)
diff --git a/target/arm/vec_internal.h b/target/arm/vec_internal.h
index ff694d870a..dba481e001 100644
--- a/target/arm/vec_internal.h
+++ b/target/arm/vec_internal.h
@@ -20,6 +20,30 @@
 #ifndef TARGET_ARM_VEC_INTERNALS_H
 #define TARGET_ARM_VEC_INTERNALS_H
 
+/*
+ * Note that vector data is stored in host-endian 64-bit chunks,
+ * so addressing units smaller than that needs a host-endian fixup.
+ *
+ * The H<N> macros are used when indexing an array of elements of size N.
+ *
+ * The H1_<N> macros are used when performing byte arithmetic and then
+ * casting the final pointer to a type of size N.
+ */
+#ifdef HOST_WORDS_BIGENDIAN
+#define H1(x)   ((x) ^ 7)
+#define H1_2(x) ((x) ^ 6)
+#define H1_4(x) ((x) ^ 4)
+#define H2(x)   ((x) ^ 3)
+#define H4(x)   ((x) ^ 1)
+#else
+#define H1(x)   (x)
+#define H1_2(x) (x)
+#define H1_4(x) (x)
+#define H2(x)   (x)
+#define H4(x)   (x)
+#endif
+
+
 static inline void clear_tail(void *vd, uintptr_t opr_sz, uintptr_t max_sz)
 {
     uint64_t *d = vd + opr_sz;