Sk4f: add floor()

bench/Sk4fBench.cpp

Index: bench/Sk4fBench.cpp
diff --git a/bench/Sk4fBench.cpp b/bench/Sk4fBench.cpp
index d5201fa2f0a2292430454789562e57a4f1f7585a..a932c295d4aa2f9bab65c165b37bbebeee85e569 100644
--- a/bench/Sk4fBench.cpp
+++ b/bench/Sk4fBench.cpp
@@ -40,6 +40,22 @@ DEF_BENCH(return new Sk4fRoundtripBench<uint8_t>;)
 DEF_BENCH(return new Sk4fRoundtripBench<uint16_t>;)
 DEF_BENCH(return new Sk4fRoundtripBench<int>;)
 
+struct Sk4fFloorBench : public Benchmark {
+    Sk4fFloorBench() {}
+
+    const char* onGetName() override { return "Sk4f_floor"; }
+    bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
+
+    void onDraw(int loops, SkCanvas* canvas) override {
+        Sk4f fs(1,2,3,4);
+        while (loops --> 0) {
+            fs = fs.floor();
+        }
+        fs.store((float*)blackhole);
+    }
+};
+DEF_BENCH(return new Sk4fFloorBench;)
+
 struct Sk4fGradientBench : public Benchmark {
     const char* onGetName() override { return "Sk4f_gradient"; }
     bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }