Merge pull request #8120 from MerryMage/cdts

Jit64: Make DoubleToSingle a common asm routine

1 files changed, 116 insertions, 0 deletions

diff --git a/Source/UnitTests/Core/PowerPC/Jit64Common/ConvertDoubleToSingle.cpp b/Source/UnitTests/Core/PowerPC/Jit64Common/ConvertDoubleToSingle.cpp
new file mode 100644
index 0000000000..41ca31b273
--- /dev/null
+++ b/Source/UnitTests/Core/PowerPC/Jit64Common/ConvertDoubleToSingle.cpp
@@ -0,0 +1,116 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <cstring>
+#include <tuple>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+#include "Common/x64ABI.h"
+#include "Core/PowerPC/Gekko.h"
+#include "Core/PowerPC/Interpreter/Interpreter_FPUtils.h"
+#include "Core/PowerPC/Jit64/Jit.h"
+#include "Core/PowerPC/Jit64Common/Jit64AsmCommon.h"
+#include "Core/PowerPC/Jit64Common/Jit64PowerPCState.h"
+
+#include <gtest/gtest.h>
+
+namespace
+{
+class TestCommonAsmRoutines : public CommonAsmRoutines
+{
+public:
+  TestCommonAsmRoutines() : CommonAsmRoutines(jit)
+  {
+    using namespace Gen;
+
+    AllocCodeSpace(4096);
+    m_const_pool.Init(AllocChildCodeSpace(1024), 1024);
+
+    const auto raw_cdts = reinterpret_cast<double (*)(double)>(AlignCode4());
+    GenConvertDoubleToSingle();
+
+    wrapped_cdts = reinterpret_cast<u32 (*)(u64)>(AlignCode4());
+    ABI_PushRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
+
+    // Call
+    MOVQ_xmm(XMM0, R(ABI_PARAM1));
+    ABI_CallFunction(raw_cdts);
+    MOV(32, R(ABI_RETURN), R(RSCRATCH));
+
+    ABI_PopRegistersAndAdjustStack(ABI_ALL_CALLEE_SAVED, 8, 16);
+    RET();
+  }
+
+  u32 (*wrapped_cdts)(u64);
+  Jit64 jit;
+};
+}  // namespace
+
+TEST(Jit64, ConvertDoubleToSingle)
+{
+  TestCommonAsmRoutines routines;
+
+  const std::vector<u64> input_values{
+      // Special values
+      0x0000'0000'0000'0000,  // positive zero
+      0x0000'0000'0000'0001,  // smallest positive denormal
+      0x0000'0000'0100'0000,
+      0x000F'FFFF'FFFF'FFFF,  // largest positive denormal
+      0x0010'0000'0000'0000,  // smallest positive normal
+      0x0010'0000'0000'0002,
+      0x3FF0'0000'0000'0000,  // 1.0
+      0x7FEF'FFFF'FFFF'FFFF,  // largest positive normal
+      0x7FF0'0000'0000'0000,  // positive infinity
+      0x7FF0'0000'0000'0001,  // first positive SNaN
+      0x7FF7'FFFF'FFFF'FFFF,  // last positive SNaN
+      0x7FF8'0000'0000'0000,  // first positive QNaN
+      0x7FFF'FFFF'FFFF'FFFF,  // last positive QNaN
+      0x8000'0000'0000'0000,  // negative zero
+      0x8000'0000'0000'0001,  // smallest negative denormal
+      0x8000'0000'0100'0000,
+      0x800F'FFFF'FFFF'FFFF,  // largest negative denormal
+      0x8010'0000'0000'0000,  // smallest negative normal
+      0x8010'0000'0000'0002,
+      0xBFF0'0000'0000'0000,  // -1.0
+      0xFFEF'FFFF'FFFF'FFFF,  // largest negative normal
+      0xFFF0'0000'0000'0000,  // negative infinity
+      0xFFF0'0000'0000'0001,  // first negative SNaN
+      0xFFF7'FFFF'FFFF'FFFF,  // last negative SNaN
+      0xFFF8'0000'0000'0000,  // first negative QNaN
+      0xFFFF'FFFF'FFFF'FFFF,  // last negative QNaN
+
+      // (exp > 896) Boundary Case
+      0x3800'0000'0000'0000,  // 2^(-127) = Denormal in single-prec
+      0x3810'0000'0000'0000,  // 2^(-126) = Smallest single-prec normal
+      0xB800'0000'0000'0000,  // -2^(-127) = Denormal in single-prec
+      0xB810'0000'0000'0000,  // -2^(-126) = Smallest single-prec normal
+      0x3800'1234'5678'9ABC, 0x3810'1234'5678'9ABC, 0xB800'1234'5678'9ABC, 0xB810'1234'5678'9ABC,
+
+      // (exp >= 874) Boundary Case
+      0x3680'0000'0000'0000,  // 2^(-150) = Unrepresentable in single-prec
+      0x36A0'0000'0000'0000,  // 2^(-149) = Smallest single-prec denormal
+      0x36B0'0000'0000'0000,  // 2^(-148) = Single-prec denormal
+      0xB680'0000'0000'0000,  // -2^(-150) = Unrepresentable in single-prec
+      0xB6A0'0000'0000'0000,  // -2^(-149) = Smallest single-prec denormal
+      0xB6B0'0000'0000'0000,  // -2^(-148) = Single-prec denormal
+      0x3680'1234'5678'9ABC, 0x36A0'1234'5678'9ABC, 0x36B0'1234'5678'9ABC, 0xB680'1234'5678'9ABC,
+      0xB6A0'1234'5678'9ABC, 0xB6B0'1234'5678'9ABC,
+
+      // Some typical numbers
+      0x3FF8'0000'0000'0000,  // 1.5
+      0x408F'4000'0000'0000,  // 1000
+      0xC008'0000'0000'0000,  // -3
+  };
+
+  for (const u64 input : input_values)
+  {
+    const u32 expected = ConvertToSingle(input);
+    const u32 actual = routines.wrapped_cdts(input);
+
+    printf("%016llx -> %08x == %08x\n", input, actual, expected);
+
+    EXPECT_EQ(expected, actual);
+  }
+}