[Support/BLAKE3] Disable BLAKE3 assembly temporarily

rdar://91050484

Author: akyrtzi

llvm/lib/Support/BLAKE3/CMakeLists.txt

@@ -4,6 +4,9 @@ set(LLVM_BLAKE3_FILES
   blake3_portable.c
 )
 
+# Temporary disable assembly until rdar://91050484 is investigated.
+set(CAN_USE_ASSEMBLER FALSE)
+
 # The BLAKE3 team recommends using the assembly versions, from the README:
 #
 # "For each of the x86 SIMD instruction sets, four versions are available:
@@ -20,7 +23,7 @@ else()
   check_symbol_exists(__aarch64__ "" IS_ARM64)
 endif()
 
-if (IS_X64)
+if (IS_X64 AND CAN_USE_ASSEMBLER)
   if (MSVC)
     enable_language(ASM_MASM)
     list(APPEND LLVM_BLAKE3_FILES
@@ -52,5 +55,9 @@ if (IS_ARM64)
   )
 endif()
 
+if (IS_X64 AND NOT CAN_USE_ASSEMBLER)
+  add_definitions(-DBLAKE3_NO_AVX512 -DBLAKE3_NO_AVX2 -DBLAKE3_NO_SSE41 -DBLAKE3_NO_SSE2)
+endif()
+
 add_library(LLVMSupportBlake3 OBJECT EXCLUDE_FROM_ALL ${LLVM_BLAKE3_FILES})
 llvm_update_compile_flags(LLVMSupportBlake3)