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Unified Diff: src/opts/SkBlitRow_opts_SSE4.cpp

Issue 874863002: SSE4 opaque blend using intrinsics instead of assembly. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: rebase for gyp changes Created 5 years, 11 months ago
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Index: src/opts/SkBlitRow_opts_SSE4.cpp
diff --git a/src/opts/SkBlitRow_opts_SSE4.cpp b/src/opts/SkBlitRow_opts_SSE4.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..fd837d54fee4d879fd3d1d25887c343d1c51279c
--- /dev/null
+++ b/src/opts/SkBlitRow_opts_SSE4.cpp
@@ -0,0 +1,66 @@
+#include "SkBlitRow_opts_SSE4.h"
+
+// Some compilers can't compile SSSE3 or SSE4 intrinsics. We give them stub methods.
+// The stubs should never be called, so we make them crash just to confirm that.
+#if SK_CPU_SSE_LEVEL < SK_CPU_SSE_LEVEL_SSE41
+void S32A_Opaque_BlitRow32_SSE4(SkPMColor* SK_RESTRICT, const SkPMColor* SK_RESTRICT, int, U8CPU) {
+ sk_throw();
+}
+
+#else
+
+#include <emmintrin.h> // SSE2: Most _mm_foo() in this file.
+#include <smmintrin.h> // SSE4.1: _mm_testz_si128 and _mm_testc_si128.
+
+#include "SkColorPriv.h"
+#include "SkColor_opts_SSE2.h"
+
+void S32A_Opaque_BlitRow32_SSE4(SkPMColor* SK_RESTRICT dst,
+ const SkPMColor* SK_RESTRICT src,
+ int count,
+ U8CPU alpha) {
+ SkASSERT(alpha == 255);
+ // As long as we can, we'll work on 16 pixel pairs at once.
+ int count16 = count / 16;
+ __m128i* dst4 = (__m128i*)dst;
+ const __m128i* src4 = (const __m128i*)src;
+
+ for (int i = 0; i < count16 * 4; i += 4) {
+ // Load 16 source pixels.
+ __m128i s0 = _mm_loadu_si128(src4+i+0),
+ s1 = _mm_loadu_si128(src4+i+1),
+ s2 = _mm_loadu_si128(src4+i+2),
+ s3 = _mm_loadu_si128(src4+i+3);
+
+ const __m128i alphaMask = _mm_set1_epi32(0xFF << SK_A32_SHIFT);
+ const __m128i ORed = _mm_or_si128(s3, _mm_or_si128(s2, _mm_or_si128(s1, s0)));
+ if (_mm_testz_si128(ORed, alphaMask)) {
+ // All 16 source pixels are fully transparent. There's nothing to do!
+ continue;
+ }
+ const __m128i ANDed = _mm_and_si128(s3, _mm_and_si128(s2, _mm_and_si128(s1, s0)));
+ if (_mm_testc_si128(ANDed, alphaMask)) {
+ // All 16 source pixels are fully opaque. There's no need to read dst or blend it.
+ _mm_storeu_si128(dst4+i+0, s0);
+ _mm_storeu_si128(dst4+i+1, s1);
+ _mm_storeu_si128(dst4+i+2, s2);
+ _mm_storeu_si128(dst4+i+3, s3);
+ continue;
+ }
+ // The general slow case: do the blend for all 16 pixels.
+ _mm_storeu_si128(dst4+i+0, SkPMSrcOver_SSE2(s0, _mm_loadu_si128(dst4+i+0)));
+ _mm_storeu_si128(dst4+i+1, SkPMSrcOver_SSE2(s1, _mm_loadu_si128(dst4+i+1)));
+ _mm_storeu_si128(dst4+i+2, SkPMSrcOver_SSE2(s2, _mm_loadu_si128(dst4+i+2)));
+ _mm_storeu_si128(dst4+i+3, SkPMSrcOver_SSE2(s3, _mm_loadu_si128(dst4+i+3)));
+ }
+
+ // Wrap up the last <= 15 pixels.
+ for (int i = count16*16; i < count; i++) {
+ // This check is not really necessarily, but it prevents pointless autovectorization.
+ if (src[i] & 0xFF000000) {
+ dst[i] = SkPMSrcOver(src[i], dst[i]);
+ }
+ }
+}
+
+#endif
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