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Unified Diff: source/row_win.cc

Issue 2364293002: ShortToHalfFloat_AVX2 function (Closed)
Patch Set: renamed to F16 and moved into windows only section Created 4 years, 3 months ago
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Index: source/row_win.cc
diff --git a/source/row_win.cc b/source/row_win.cc
index 2a3da8969f1f51937271f2bdc25b27046fb6c512..d54f05e29e6b3e4a33918293d2f442d1aacc65b3 100644
--- a/source/row_win.cc
+++ b/source/row_win.cc
@@ -6095,6 +6095,36 @@ void ARGBPolynomialRow_AVX2(const uint8* src_argb,
}
#endif // HAS_ARGBPOLYNOMIALROW_AVX2
+// Samples assumed to be unsigned in low 9, 10 or 12 bits. Scale factor
+// adjust the sample range to 0 to 1 using a float multiply.
+// e.g. 9 bit scale is 1.0f / 512.0f
+// e.g. 10 bit scale is 1.0f / 1024.0f
+#ifdef HAS_SHORTTOHALFFLOAT_AVX2
+__declspec(naked)
+void ShortToF16Row_AVX2(const uint16* src, int16* dst, float scale, int width) {
+ __asm {
+ mov eax, [esp + 4] /* src */
+ mov edx, [esp + 8] /* dst */
+ vbroadcastss ymm4, [esp + 12] /* scale */
+ mov ecx, [esp + 16] /* width */
+
+ // 8 pixel loop.
+ convertloop:
+ vpmovzxwd ymm0, xmmword ptr [eax] // 8 shorts -> 8 ints
fbarchard1 2016/09/27 22:14:19 note vpmovzxwd is avx2 but other instructions are
+ lea eax, [eax + 16]
+ vcvtdq2ps ymm0, ymm0 // convert 8 ints to floats
+ vmulps ymm0, ymm0, ymm4 // scale to normalized range 0 to 1
+ vcvtps2ph xmm0, ymm0, 0 // float conver to 8 half floats round even
+ vmovdqu [edx], xmm0
+ lea edx, [edx + 16]
+ sub ecx, 8
+ jg convertloop
+ vzeroupper
+ ret
+ }
+}
+#endif // HAS_SHORTTOHALFFLOAT_AVX2
+
#ifdef HAS_ARGBCOLORTABLEROW_X86
// Tranform ARGB pixels with color table.
__declspec(naked)
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