From 91435249c034c1ecf5db0c7341f05e86490e42fd Mon Sep 17 00:00:00 2001
From: Paul Ferrand <paul@ferrand.cc>
Date: Sat, 30 May 2020 15:05:18 +0200
Subject: [PATCH] Added base support for runtime config

---
 src/sfizz/SIMDHelpers.cpp | 51 +++++++++++++++++++++++++++++++++++++++
 src/sfizz/SIMDHelpers.h   | 33 +++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 src/sfizz/SIMDHelpers.cpp

diff --git a/src/sfizz/SIMDHelpers.cpp b/src/sfizz/SIMDHelpers.cpp
new file mode 100644
index 00000000..b3081621
--- /dev/null
+++ b/src/sfizz/SIMDHelpers.cpp
@@ -0,0 +1,51 @@
+#include "SIMDHelpers.h"
+#include <array>
+
+namespace sfz{
+
+static std::array<bool, static_cast<unsigned>(sfz::SIMDOps::_sentinel)> simdStatus;
+static bool simdStatusInitialized = false;
+
+static void resetSIMDStatus()
+{
+    simdStatus[static_cast<unsigned>(SIMDOps::writeInterleaved)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::readInterleaved)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::fill)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::gain)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::divide)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::mathfuns)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::loopingSFZIndex)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::saturatingSFZIndex)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::linearRamp)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::multiplicativeRamp)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::add)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::subtract)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::multiplyAdd)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::copy)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::pan)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::cumsum)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::diff)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::sfzInterpolationCast)] = true;
+    simdStatus[static_cast<unsigned>(SIMDOps::mean)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::meanSquared)] = false;
+    simdStatus[static_cast<unsigned>(SIMDOps::upsampling)] = true;
+    simdStatusInitialized = true;
+}
+
+static void setSIMDOpStatus(SIMDOps op, bool status)
+{
+    if (!simdStatusInitialized)
+        resetSIMDStatus();
+
+    simdStatus[static_cast<unsigned>(op)] = status;
+}
+static bool getSIMDOpStatus(SIMDOps op)
+{
+    if (!simdStatusInitialized)
+        resetSIMDStatus();
+
+    return simdStatus[static_cast<unsigned>(op)];
+}
+
+}
+
diff --git a/src/sfizz/SIMDHelpers.h b/src/sfizz/SIMDHelpers.h
index 0600ddd6..732d615c 100644
--- a/src/sfizz/SIMDHelpers.h
+++ b/src/sfizz/SIMDHelpers.h
@@ -41,6 +41,39 @@
 #include <cmath>
 
 namespace sfz {
+
+// NOTE: The goal is to collapse all checks on release, and compute the sentinels for the span versions
+// https://godbolt.org/z/43dveW shows this should work
+
+enum class SIMDOps {
+    writeInterleaved,
+    readInterleaved,
+    fill,
+    gain,
+    divide,
+    mathfuns,
+    loopingSFZIndex,
+    saturatingSFZIndex,
+    linearRamp,
+    multiplicativeRamp,
+    add,
+    subtract,
+    multiplyAdd,
+    copy,
+    pan,
+    cumsum,
+    diff,
+    sfzInterpolationCast,
+    mean,
+    meanSquared,
+    upsampling,
+    _sentinel //
+};
+// Enable or disable SIMD accelerators at runtime
+static void setSIMDOpStatus(SIMDOps op, bool status);
+static bool getSIMDOpStatus(SIMDOps op);
+
+
 namespace _internals {
     template <class T>
     inline void snippetRead(const T*& input, T*& outputLeft, T*& outputRight)