From 643d97e878a33022f69446638e1c730452d8db81 Mon Sep 17 00:00:00 2001
From: Mike Smith <mango@live.cn>
Date: Tue, 11 Feb 2025 15:52:36 +0800
Subject: [PATCH] disable fastmath for fallback backend

---
 include/luisa/runtime/byte_buffer.h  |  1 +
 src/backends/fallback/CMakeLists.txt | 14 +++++++-------
 src/runtime/byte_buffer.cpp          |  7 +++++--
 3 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/include/luisa/runtime/byte_buffer.h b/include/luisa/runtime/byte_buffer.h
index ea71e33bd..c42101ca9 100644
--- a/include/luisa/runtime/byte_buffer.h
+++ b/include/luisa/runtime/byte_buffer.h
@@ -35,6 +35,7 @@ class LC_RUNTIME_API ByteBuffer final : public Resource {
     using Resource::operator bool;
 
     [[nodiscard]] ByteBufferView view() const noexcept;
+    [[nodiscard]] ByteBufferView view(size_t offset_bytes, size_t size_bytes) const noexcept;
 
     [[nodiscard]] luisa::unique_ptr<BufferUploadCommand> copy_from(const void *data) const noexcept;
     [[nodiscard]] luisa::unique_ptr<BufferCopyCommand> copy_from(ByteBufferView source) const noexcept;
diff --git a/src/backends/fallback/CMakeLists.txt b/src/backends/fallback/CMakeLists.txt
index 5691821ea..0de2973ff 100644
--- a/src/backends/fallback/CMakeLists.txt
+++ b/src/backends/fallback/CMakeLists.txt
@@ -107,13 +107,13 @@ if (LLVM_FOUND AND embree_FOUND)
         target_link_libraries(luisa-compute-backend-fallback PRIVATE ${LLVM_LIBS})
     endif ()
 
-    if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-        target_compile_options(luisa-compute-backend-fallback PRIVATE
-                /wd4624 /wd4996 # do not complain about LLVM
-                /fp:fast /fp:contract /fp:except- /ARCH:AVX2)
-    else ()
-        target_compile_options(luisa-compute-backend-fallback PRIVATE -ffast-math)
-    endif ()
+    #    if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+    #        target_compile_options(luisa-compute-backend-fallback PRIVATE
+    #                /wd4624 /wd4996 # do not complain about LLVM
+    #                /fp:fast /fp:contract /fp:except- /ARCH:AVX2)
+    #    else ()
+    #        target_compile_options(luisa-compute-backend-fallback PRIVATE -ffast-math)
+    #    endif ()
 
 elseif (NOT LUISA_COMPUTE_CHECK_BACKEND_DEPENDENCIES)
     message(FATAL_ERROR "LLVM or Embree not found for the fallback backend.")
diff --git a/src/runtime/byte_buffer.cpp b/src/runtime/byte_buffer.cpp
index 06f02fef0..cb4413baf 100644
--- a/src/runtime/byte_buffer.cpp
+++ b/src/runtime/byte_buffer.cpp
@@ -43,6 +43,10 @@ ByteBufferView ByteBuffer::view() const noexcept {
     return ByteBufferView{native_handle(), handle(), 0u, _size_bytes, _size_bytes};
 }
 
+ByteBufferView ByteBuffer::view(size_t offset_bytes, size_t size_bytes) const noexcept {
+    return view().subview(offset_bytes, size_bytes);
+}
+
 luisa::unique_ptr<BufferDownloadCommand> ByteBuffer::copy_to(void *data) const noexcept {
     _check_is_valid();
     return view().copy_to(data);
@@ -71,8 +75,7 @@ ByteBufferView ByteBufferView::subview(size_t offset_bytes, size_t size_bytes) c
     if (offset_bytes + size_bytes > _size) [[unlikely]] {
         detail::error_buffer_subview_overflow(offset_bytes, size_bytes, _size);
     }
-    return ByteBufferView{_native_handle, _handle, _offset_bytes + offset_bytes,
-                          size_bytes, _total_size};
+    return ByteBufferView{_native_handle, _handle, _offset_bytes + offset_bytes, size_bytes, _total_size};
 }
 
 luisa::unique_ptr<BufferDownloadCommand> ByteBufferView::copy_to(void *data) const noexcept {