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Unified Diff: source/row_neon.cc

Issue 2467723002: HalfFloat Neon for ARMv7. (Closed)
Patch Set: bump version Created 4 years, 1 month ago
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Index: source/row_neon.cc
diff --git a/source/row_neon.cc b/source/row_neon.cc
index dc081fa30747dba81fcd133e5b4f44cb92c20629..9385b275dc4253bcd7c4830f3b44145ff094e724 100644
--- a/source/row_neon.cc
+++ b/source/row_neon.cc
@@ -2733,7 +2733,63 @@ void SobelYRow_NEON(const uint8* src_y0, const uint8* src_y1,
: "cc", "memory", "q0", "q1" // Clobber List
);
}
-#endif // defined(__ARM_NEON__) && !defined(__aarch64__)
+
+void HalfFloat1Row_NEON(const uint16* src, uint16* dst, float, int width) {
+ asm volatile (
+ "vdup.32 q0, %3 \n"
+
+ "1: \n"
+ MEMACCESS(0)
+ "vld1.8 {q1}, [%0]! \n" // load 8 shorts
+ "subs %2, %2, #8 \n" // 8 pixels per loop
+ "vmovl.u8 q2, d2 \n" // 8 int's
+ "vmovl.u8 q3, d3 \n"
+ "vcvt.f32.u32 q2, q2 \n" // 8 floats
+ "vcvt.f32.u32 q3, q3 \n"
+ "vmul.f32 q2, q2, q0 \n" // adjust exponent
+ "vmul.f32 q3, q3, q0 \n"
+ "vqshrn.u32 d2, q2, #13 \n" // isolate halffloat
+ "vqshrn.u32 d3, q3, #13 \n"
+ MEMACCESS(1)
+ "vst1.8 {q1}, [%0]! \n"
+ "bgt 1b \n"
+ : "+r"(src), // %0
+ "+r"(dst), // %1
+ "+r"(width) // %2
+ : "r"(1.9259299444e-34f) // %3
+ : "cc", "memory", "q0", "q1", "q2", "q3"
+ );
+}
+
+// TODO(fbarchard): multiply by element.
+void HalfFloatRow_NEON(const uint16* src, uint16* dst, float scale, int width) {
+ asm volatile (
+ "vdup.32 q0, %3 \n"
+
+ "1: \n"
+ MEMACCESS(0)
+ "vld1.8 {q1}, [%0]! \n" // load 8 shorts
+ "subs %2, %2, #8 \n" // 8 pixels per loop
+ "vmovl.u8 q2, d2 \n" // 8 int's
+ "vmovl.u8 q3, d3 \n"
+ "vcvt.f32.u32 q2, q2 \n" // 8 floats
+ "vcvt.f32.u32 q3, q3 \n"
+ "vmul.f32 q2, q2, q0 \n" // adjust exponent
+ "vmul.f32 q3, q3, q0 \n"
+ "vqshrn.u32 d2, q2, #13 \n" // isolate halffloat
+ "vqshrn.u32 d3, q3, #13 \n"
+ MEMACCESS(1)
+ "vst1.8 {q1}, [%0]! \n"
+ "bgt 1b \n"
+ : "+r"(src), // %0
+ "+r"(dst), // %1
+ "+r"(width) // %2
+ : "r"(scale * 1.9259299444e-34f) // %3
+ : "cc", "memory", "q0", "q1", "q2", "q3"
+ );
+}
+
+#endif // !defined(LIBYUV_DISABLE_NEON) && defined(__ARM_NEON__)..
#ifdef __cplusplus
} // extern "C"
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