diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07a14c6fc..9f23458a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,51 @@ else()
     endif()
 endif()
 
+# ---------------------------
+# Linux / GCC / Clang SIMD flags
+# ---------------------------
+if(NOT MSVC)
+    check_simd_flag("SSE2" "-msse2")
+    check_simd_flag("SSE3" "-msse3")
+    check_simd_flag("SSSE3" "-mssse3")
+    check_simd_flag("SSE4_1" "-msse4.1")
+    check_simd_flag("SSE4_2" "-msse4.2")
+    check_simd_flag("AVX" "-mavx")
+    check_simd_flag("AVX2" "-mavx2")
+    check_simd_flag("AVX512F" "-mavx512f")
+endif()
+
+# ---------------------------
+# Windows / MSVC SIMD detection
+# ---------------------------
+if(MSVC)
+    # Baseline SSE2 (guaranteed)
+    add_compile_options(/arch:SSE2)
+    add_definitions(-DTORQUE_HAVE_SSE2)
+
+    # SSE4.1 detection: check for <smmintrin.h> availability
+    check_include_file("smmintrin.h" HAVE_SSE4_1_HEADER)
+    if(HAVE_SSE4_1_HEADER)
+        message(STATUS "MSVC: SSE4.1 header available")
+        add_definitions(-DTORQUE_HAVE_SSE4_1)
+    else()
+        message(STATUS "MSVC: SSE4.1 header NOT available")
+    endif()
+
+    # AVX
+    check_include_file("immintrin.h" HAVE_AVX_HEADER)
+    if(HAVE_AVX_HEADER)
+        message(STATUS "MSVC: AVX header available")
+        add_definitions(-DTORQUE_HAVE_AVX)
+        add_compile_options(/arch:AVX)
+        if(MSVC_VERSION GREATER_EQUAL 1800) # assume avx2 support if post VS2013
+            add_definitions(-DTORQUE_HAVE_AVX2)
+            add_compile_options(/arch:AVX2)
+        endif()
+    endif()
+
+endif()
+
 if(NOT TORQUE_SCRIPT_EXTENSION)
     set(TORQUE_SCRIPT_EXTENSION "tscript" CACHE STRING "The default script extension to use for TorqueScript files")
 endif()
diff --git a/Engine/source/math/mMath_CPU.cpp b/Engine/source/math/mMath_CPU.cpp
index 4bd4034e6..a3391c911 100644
--- a/Engine/source/math/mMath_CPU.cpp
+++ b/Engine/source/math/mMath_CPU.cpp
@@ -196,12 +196,14 @@ float math_backend::float4::dot(const float* a, const float* b)
    // ---- SSE4.1 : dedicated dot instruction ----
    case ISA::AVX2:
    case ISA::AVX:
-   case ISA::SSE41: {
+   case ISA::SSE41:
+#ifdef TORQUE_HAVE_SSE4_1 // Linux macro required in case sse4 does not exist.
+   {
       __m128 va = _mm_loadu_ps(a);
       __m128 vb = _mm_loadu_ps(b);
       return _mm_cvtss_f32(_mm_dp_ps(va, vb, 0xFF));
    }
-
+#endif
    // ---- SSE2 fallback (no horizontal ops available) ----
    case ISA::SSE2: {
       __m128 va = _mm_loadu_ps(a);
diff --git a/Tools/CMake/torque_macros.cmake b/Tools/CMake/torque_macros.cmake
index 48bb6896e..6ed586f3c 100644
--- a/Tools/CMake/torque_macros.cmake
+++ b/Tools/CMake/torque_macros.cmake
@@ -133,4 +133,24 @@ macro(addFramework framework)
       find_library(_${framework}_FRAMEWORK_PATH ${framework} PATHS /System/Library/Frameworks /Library/Frameworks)
       set(TORQUE_LINK_FRAMEWORKS ${TORQUE_LINK_FRAMEWORKS} "${_${framework}_FRAMEWORK_PATH}")
 	endif()
-endmacro()
\ No newline at end of file
+endmacro()
+
+include(CheckCXXCompilerFlag)
+include(CheckIncludeFile)
+
+macro(check_simd_flag FLAG_NAME GCC_FLAG)
+    string(TOUPPER ${FLAG_NAME} FLAG_UPPER)
+    if(MSVC)
+        message(STATUS "MSVC: skipping GCC-style flag ${GCC_FLAG}")
+    else()
+        check_cxx_compiler_flag(${GCC_FLAG} COMPILER_SUPPORTS_${FLAG_UPPER})
+        if(COMPILER_SUPPORTS_${FLAG_UPPER})
+            message(STATUS "Compiler supports ${FLAG_NAME}: ${GCC_FLAG}")
+            add_compile_options(${GCC_FLAG})
+            add_definitions(-DTORQUE_HAVE_${FLAG_UPPER})
+        else()
+            message(STATUS "Compiler does NOT support ${FLAG_NAME}: ${GCC_FLAG}")
+        endif()
+    endif()
+endmacro()
+