1 files changed, 162 insertions, 0 deletions
diff --git a/third_party/wasm2c/src/config.cc b/third_party/wasm2c/src/config.cc
new file mode 100644
index 0000000000..9347c860a9
--- /dev/null
+++ b/third_party/wasm2c/src/config.cc
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "config.h"
+
+#include <cstdarg>
+#include <cstdio>
+
+#if COMPILER_IS_MSVC && _M_X64
+#include <emmintrin.h>
+#elif COMPILER_IS_MSVC && _M_IX86
+#include <float.h>
+#endif
+
+/* c99-style vsnprintf for MSVC < 2015. See http://stackoverflow.com/a/8712996
+ using _snprintf or vsnprintf will not-properly null-terminate, and will return
+ -1 instead of the number of characters needed on overflow. */
+#if COMPILER_IS_MSVC
+int wabt_vsnprintf(char* str, size_t size, const char* format, va_list ap) {
+  int result = -1;
+  if (size != 0) {
+    result = _vsnprintf_s(str, size, _TRUNCATE, format, ap);
+  }
+  if (result == -1) {
+    result = _vscprintf(format, ap);
+  }
+  return result;
+}
+
+#if !HAVE_SNPRINTF
+int wabt_snprintf(char* str, size_t size, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  int result = wabt_vsnprintf(str, size, format, args);
+  va_end(args);
+  return result;
+}
+#endif
+#endif
+
+#if COMPILER_IS_MSVC && _M_IX86
+// Allow the following functions to change the floating-point environment (e.g.
+// update to 64-bit precision in the mantissa). This is only needed for x87
+// floats, which are only used on MSVC 32-bit.
+#pragma fenv_access (on)
+namespace {
+
+typedef unsigned int FPControl;
+
+FPControl Set64BitPrecisionControl() {
+  FPControl old_ctrl = _control87(0, 0);
+  _control87(_PC_64, _MCW_PC);
+  return old_ctrl;
+}
+
+void ResetPrecisionControl(FPControl old_ctrl) {
+  _control87(old_ctrl, _MCW_PC);
+}
+
+}  // end of anonymous namespace
+#endif
+
+double wabt_convert_uint64_to_double(uint64_t x) {
+#if COMPILER_IS_MSVC && _M_X64
+  // MSVC on x64 generates uint64 -> float conversions but doesn't do
+  // round-to-nearest-ties-to-even, which is required by WebAssembly.
+  __m128d result = _mm_setzero_pd();
+  if (x & 0x8000000000000000ULL) {
+    result = _mm_cvtsi64_sd(result, (x >> 1) | (x & 1));
+    result = _mm_add_sd(result, result);
+  } else {
+    result = _mm_cvtsi64_sd(result, x);
+  }
+  return _mm_cvtsd_f64(result);
+#elif COMPILER_IS_MSVC && _M_IX86
+  // MSVC on x86 converts from i64 -> double -> float, which causes incorrect
+  // rounding. Using the x87 float stack instead preserves the correct
+  // rounding.
+  FPControl old_ctrl = Set64BitPrecisionControl();
+  static const double c = 18446744073709551616.0;
+  double result;
+  __asm fild x;
+  if (x & 0x8000000000000000ULL) {
+    __asm fadd c;
+  }
+  __asm fstp result;
+  ResetPrecisionControl(old_ctrl);
+  return result;
+#else
+  return static_cast<double>(x);
+#endif
+}
+
+float wabt_convert_uint64_to_float(uint64_t x) {
+#if COMPILER_IS_MSVC && _M_X64
+  // MSVC on x64 generates uint64 -> float conversions but doesn't do
+  // round-to-nearest-ties-to-even, which is required by WebAssembly.
+  __m128 result = _mm_setzero_ps();
+  if (x & 0x8000000000000000ULL) {
+    result = _mm_cvtsi64_ss(result, (x >> 1) | (x & 1));
+    result = _mm_add_ss(result, result);
+  } else {
+    result = _mm_cvtsi64_ss(result, x);
+  }
+  return _mm_cvtss_f32(result);
+#elif COMPILER_IS_MSVC && _M_IX86
+  // MSVC on x86 converts from i64 -> double -> float, which causes incorrect
+  // rounding. Using the x87 float stack instead preserves the correct
+  // rounding.
+  FPControl old_ctrl = Set64BitPrecisionControl();
+  static const float c = 18446744073709551616.0f;
+  float result;
+  __asm fild x;
+  if (x & 0x8000000000000000ULL) {
+    __asm fadd c;
+  }
+  __asm fstp result;
+  ResetPrecisionControl(old_ctrl);
+  return result;
+#else
+  return static_cast<float>(x);
+#endif
+}
+
+double wabt_convert_int64_to_double(int64_t x) {
+#if COMPILER_IS_MSVC && _M_IX86
+  double result;
+  __asm fild x;
+  __asm fstp result;
+  return result;
+#else
+  return static_cast<double>(x);
+#endif
+}
+
+float wabt_convert_int64_to_float(int64_t x) {
+#if COMPILER_IS_MSVC && _M_IX86
+  float result;
+  __asm fild x;
+  __asm fstp result;
+  return result;
+#else
+  return static_cast<float>(x);
+#endif
+}
+
+#if COMPILER_IS_MSVC && _M_IX86
+#pragma fenv_access (off)
+#endif