Revert D120327 "compiler-rt: Add udivmodei5 to builtins and add bitint library"

It has several problems like not-compilable weak attribute with MSVC
(and the usage needs further scrutiny), and " different types for formal and actual parameter"
https://lab.llvm.org/buildbot/#/builders/127/builds/27760/steps/7/logs/stdio

This reverts commit 8843245, 492c5c0, bf2dc4b.

Author: MaskRay

compiler-rt/CMakeLists.txt

@@ -34,8 +34,6 @@ include(CompilerRTUtils)
 
 option(COMPILER_RT_BUILD_BUILTINS "Build builtins" ON)
 mark_as_advanced(COMPILER_RT_BUILD_BUILTINS)
-option(COMPILER_RT_BUILD_BITINT "Build bitint" ON)
-mark_as_advanced(COMPILER_RT_BUILD_BITINT)
 option(COMPILER_RT_BUILD_CRT "Build crtbegin.o/crtend.o" ON)
 mark_as_advanced(COMPILER_RT_BUILD_CRT)
 option(COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY "Use eh_frame in crtbegin.o/crtend.o" ON)

compiler-rt/cmake/builtin-config-ix.cmake

@@ -65,9 +65,6 @@ set(ALL_BUILTIN_SUPPORTED_ARCH
   ${RISCV32} ${RISCV64} ${SPARC} ${SPARCV9}
   ${WASM32} ${WASM64} ${VE})
 
-set(ALL_BITINT_SUPPORTED_ARCH
-  ${ALL_BUILTIN_SUPPORTED_ARCH})
-
 include(CompilerRTUtils)
 include(CompilerRTDarwinUtils)
 
@@ -198,7 +195,6 @@ if(APPLE)
   endforeach()
 
   list_intersect(BUILTIN_SUPPORTED_ARCH ALL_BUILTIN_SUPPORTED_ARCH COMPILER_RT_SUPPORTED_ARCH)
-  list_intersect(BITINT_SUPPORTED_ARCH ALL_BITINT_SUPPORTED_ARCH COMPILER_RT_SUPPORTED_ARCH)
 
 else()
   # If we're not building the builtins standalone, just rely on the  tests in
@@ -210,8 +206,6 @@ else()
   # Architectures supported by compiler-rt libraries.
   filter_available_targets(BUILTIN_SUPPORTED_ARCH
     ${ALL_BUILTIN_SUPPORTED_ARCH})
-  filter_available_targets(BITINT_SUPPORTED_ARCH
-    ${ALL_BITINT_SUPPORTED_ARCH})
 endif()
 
 message(STATUS "Builtin supported architectures: ${BUILTIN_SUPPORTED_ARCH}")

compiler-rt/lib/CMakeLists.txt

@@ -17,10 +17,6 @@ if(COMPILER_RT_BUILD_BUILTINS)
   add_subdirectory(builtins)
 endif()
 
-if(COMPILER_RT_BUILD_BITINT)
-  add_subdirectory(bitint)
-endif()
-
 if(COMPILER_RT_BUILD_CRT)
   add_subdirectory(crt)
 endif()

compiler-rt/lib/bitint/CMakeLists.txt

@@ -174,7 +174,6 @@ set(GENERIC_SOURCES
   udivmoddi4.c
   udivmodsi4.c
   udivmodti4.c
-  udivmodei5.c
   udivsi3.c
   udivti3.c
   umoddi3.c

compiler-rt/lib/builtins/CMakeLists.txt

@@ -110,29 +110,6 @@ COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
 
 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int *rem);
 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem);
-
-/// Computes the unsigned division of a / b for two large integers
-/// composed of n significant words.
-/// Writes the quotient to quo and the remainder to rem.
-///
-/// \param quo The quotient represented by n words. Must be non-null.
-/// \param rem The remainder represented by n words. Must be non-null.
-/// \param a The dividend represented by n + 1 words. Must be non-null.
-/// \param b The divisor represented by n words. Must be non-null.
-
-/// \note The word order is in host endianness.
-/// \note Might modify a and b.
-/// \note The storage of 'a' needs to hold n + 1 elements because some
-///       implementations need extra scratch space in the most significant word.
-///       The value of that word is ignored.
-COMPILER_RT_ABI void __udivmodei5(su_int *quo, su_int *rem, su_int *a,
-                                  su_int *b, unsigned int n);
-
-/// Computes the signed division of a / b.
-/// See __udivmodei5 for details.
-COMPILER_RT_ABI void __divmodei5(su_int *quo, su_int *rem, su_int *a, su_int *b,
-                                 unsigned int words);
-
 #ifdef CRT_HAS_128BIT
 COMPILER_RT_ABI int __clzti2(ti_int a);
 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int *rem);

compiler-rt/lib/builtins/int_lib.h

@@ -60,9 +60,6 @@ if(COMPILER_RT_CAN_EXECUTE_TESTS)
   if(COMPILER_RT_BUILD_BUILTINS)
     add_subdirectory(builtins)
   endif()
-  if(COMPILER_RT_BUILD_BITINT)
-    add_subdirectory(bitint)
-  endif()
   if(COMPILER_RT_BUILD_SANITIZERS)
     compiler_rt_test_runtime(interception)