[Pixman] [PATCH v2 2/5] vmx: adjust macros when loading vectors on ppc64le

[Oded Gabbay]

From: Fernando Seiti Furusato <ferseiti at linux.vnet.ibm.com>

Replaced usage of vec_lvsl to direct unaligned assignment
operation (=). That is because, according to Power ABI Specification,
the usage of lvsl is deprecated on ppc64le.

Changed COMPUTE_SHIFT_{MASK,MASKS,MASKC} macro usage to no-op for powerpc
little endian since unaligned access is supported on ppc64le.

v2:

- replace _LITTLE_ENDIAN with WORDS_BIGENDIAN for consistency
- fixed whitespaces and indentation issues

Signed-off-by: Fernando Seiti Furusato <ferseiti at linux.vnet.ibm.com>
Reviewed-by: Adam Jackson <ajax at redhat.com>
Signed-off-by: Oded Gabbay <oded.gabbay at gmail.com>
---
 pixman/pixman-vmx.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/pixman/pixman-vmx.c b/pixman/pixman-vmx.c
index d0a4fc8..e33d9d9 100644
--- a/pixman/pixman-vmx.c
+++ b/pixman/pixman-vmx.c
@@ -136,6 +136,7 @@ over (vector unsigned int src,
     over (pix_multiply (src, mask),					\
           pix_multiply (srca, mask), dest)
 
+#ifdef WORDS_BIGENDIAN
 
 #define COMPUTE_SHIFT_MASK(source)					\
     source ## _mask = vec_lvsl (0, source);
@@ -169,6 +170,30 @@ over (vector unsigned int src,
     v ## mask = (typeof(v ## mask))			  \
 	vec_perm (tmp1, tmp2, mask ## _mask);
 
+#else
+
+/* Now the COMPUTE_SHIFT_{MASK, MASKS, MASKC} below are just no-op.
+ * They are defined that way because little endian altivec can do unaligned
+ * reads natively and have no need for constructing the permutation pattern
+ * variables.
+ */
+#define COMPUTE_SHIFT_MASK(source)
+
+#define COMPUTE_SHIFT_MASKS(dest, source)
+
+#define COMPUTE_SHIFT_MASKC(dest, source, mask)
+
+# define LOAD_VECTORS(dest, source)			\
+    v ## source = *((typeof(v ## source)*)source);	\
+    v ## dest = *((typeof(v ## dest)*)dest);
+
+# define LOAD_VECTORSC(dest, source, mask)		\
+    v ## source = *((typeof(v ## source)*)source);	\
+    v ## dest = *((typeof(v ## dest)*)dest);		\
+    v ## mask = *((typeof(v ## mask)*)mask);
+
+#endif /* WORDS_BIGENDIAN */
+
 #define LOAD_VECTORSM(dest, source, mask)				\
     LOAD_VECTORSC (dest, source, mask)					\
     v ## source = pix_multiply (v ## source,				\
-- 
2.4.3