ARM: workaround for gcc bug in vshll_n_u8 intrinsic

Some versions of gcc (cs2009q1, 4.4.1) incorrectly reject
shift operand having value >= 8, claiming that it is out of
range. So inline assembly is used as a workaround.

diff --git a/pixman/pixman-arm-neon.c b/pixman/pixman-arm-neon.c
index 4125d1b..3e7f566 100644 (file)
--- a/pixman/pixman-arm-neon.c
+++ b/pixman/pixman-arm-neon.c
@@ -64,6 +64,12 @@ unpack0565 (uint16x8_t rgb)
     return res;
 }
 
+#ifdef USE_GCC_INLINE_ASM
+/* Some versions of gcc have problems with vshll_n_u8 intrinsic (Bug 23576) */
+#define vshll_n_u8(a, n) ({ uint16x8_t r; \
+    asm ("vshll.u8 %q0, %P1, %2\n" : "=w" (r) : "w" (a), "i" (n)); r; })
+#endif
+
 static force_inline uint16x8_t
 pack0565 (uint8x8x4_t s)
 {