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Unified Diff: src/opts/SkNx_sse.h

Issue 1891513002: skcpu: sse4.1 floor, f16c f16<->f32 (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: invert #ifs Created 4 years, 8 months ago
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Index: src/opts/SkNx_sse.h
diff --git a/src/opts/SkNx_sse.h b/src/opts/SkNx_sse.h
index 80c7f0e9ae79f1a0e0743d77eb50a0fdbfb9a499..1fc235d99be4793bf9c9cffa906ccd0bfa39155e 100644
--- a/src/opts/SkNx_sse.h
+++ b/src/opts/SkNx_sse.h
@@ -8,21 +8,13 @@
#ifndef SkNx_sse_DEFINED
#define SkNx_sse_DEFINED
+#include "SkCpu.h"
+
// This file may assume <= SSE2, but must check SK_CPU_SSE_LEVEL for anything more recent.
// If you do, make sure this is in a static inline function... anywhere else risks violating ODR.
#define SKNX_IS_FAST
-// SSE 4.1 has _mm_floor_ps to floor 4 floats. We emulate it:
-// - roundtrip through integers via truncation
-// - subtract 1 if that's too big (possible for negative values).
-// This restricts the domain of our inputs to a maximum somehwere around 2^31. Seems plenty big.
-static inline __m128 sse2_mm_floor_ps(__m128 v) {
- __m128 roundtrip = _mm_cvtepi32_ps(_mm_cvttps_epi32(v));
- __m128 too_big = _mm_cmpgt_ps(roundtrip, v);
- return _mm_sub_ps(roundtrip, _mm_and_ps(too_big, _mm_set1_ps(1.0f)));
-}
-
template <>
class SkNx<2, float> {
public:
@@ -97,7 +89,25 @@ public:
static SkNx Max(const SkNx& l, const SkNx& r) { return _mm_max_ps(l.fVec, r.fVec); }
SkNx abs() const { return _mm_andnot_ps(_mm_set1_ps(-0.0f), fVec); }
- SkNx floor() const { return sse2_mm_floor_ps(fVec); }
+ SkNx floor() const {
+ if (SkCpu::Supports(SkCpu::SSE41)) {
+ __m128 r;
+ #if defined(__GNUC__) || defined(__clang__)
+ asm("roundps $0x1, %[fVec], %[r]" : [r]"=x"(r) : [fVec]"x"(fVec));
+ #else
+ r = _mm_floor_ps(fVec);
+ #endif
+ return r;
+ }
+ // Emulate _mm_floor_ps() with SSE2:
+ // - roundtrip through integers via truncation
+ // - subtract 1 if that's too big (possible for negative values).
+ // This restricts the domain of our inputs to a maximum somehwere around 2^31.
+ // Seems plenty big.
+ __m128 roundtrip = _mm_cvtepi32_ps(_mm_cvttps_epi32(fVec));
+ __m128 too_big = _mm_cmpgt_ps(roundtrip, fVec);
+ return _mm_sub_ps(roundtrip, _mm_and_ps(too_big, _mm_set1_ps(1.0f)));
+ }
SkNx sqrt() const { return _mm_sqrt_ps (fVec); }
SkNx rsqrt() const { return _mm_rsqrt_ps(fVec); }
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