Index: source/row_neon.cc |
diff --git a/source/row_neon.cc b/source/row_neon.cc |
index 91d6aa857b68ac9e9618bf56e56c3dd223344abe..7574cee85e252159238fd6bac14c73ab7604a13f 100644 |
--- a/source/row_neon.cc |
+++ b/source/row_neon.cc |
@@ -1298,6 +1298,23 @@ void ARGBToYRow_NEON(const uint8* src_argb, uint8* dst_y, int width) { |
); |
} |
+void ARGBExtractAlphaRow_NEON(const uint8* src_argb, uint8* dst_a, int width) { |
+ asm volatile ( |
+ "1: \n" |
+ MEMACCESS(0) |
+ "vld4.8 {d0, d1, d2, d3}, [%0]! \n" // load row 8 pixels |
+ "subs %2, %2, #8 \n" // 8 processed per loop |
+ MEMACCESS(1) |
+ "vst1.8 {d3}, [%1]! \n" // store 8 A's. |
+ "bgt 1b \n" |
+ : "+r"(src_argb), // %0 |
+ "+r"(dst_a), // %1 |
+ "+r"(width) // %2 |
+ : |
+ : "cc", "memory", "d0", "d1", "d2", "d3" // Clobber List |
+ ); |
+} |
+ |
void ARGBToYJRow_NEON(const uint8* src_argb, uint8* dst_y, int width) { |
asm volatile ( |
"vmov.u8 d24, #15 \n" // B * 0.11400 coefficient |