Add powerpc64 to compiler-rt build infrastructure.

[saugustine]

Summary

Add powerpc64 to compiler-rt build infrastructure.

[timshen]

Offline discussion discovered that clear_cache() is not implemented for powerpc64 (the big-endian target). I think it's correct to use the same implementation of clear_cache() for both endianness. With that change (possibly in the same patch), this patch looks good.

[saugustine]

• The current powerpc implementation of clear cache works for big endian.

[saugustine]

In D36108#826673, @timshen wrote:

Offline discussion discovered that clear_cache() is not implemented for powerpc64 (the big-endian target). I think it's correct to use the same implementation of clear_cache() for both endianness. With that change (possibly in the same patch), this patch looks good.

Done. Thanks.

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

 macro(detect_target_arch)
   check_symbol_exists(__arm__ "" __ARM)
   check_symbol_exists(__aarch64__ "" __AARCH64)
   check_symbol_exists(__x86_64__ "" __X86_64)
   check_symbol_exists(__i686__ "" __I686)
   check_symbol_exists(__i386__ "" __I386)
   check_symbol_exists(__mips__ "" __MIPS)
   check_symbol_exists(__mips64__ "" __MIPS64)
+  check_symbol_exists(__powerpc64__ "" __PPC64)
+  check_symbol_exists(__powerpc64le__ "" __PPC64LE)
   check_symbol_exists(__s390x__ "" __S390X)
   check_symbol_exists(__wasm32__ "" __WEBASSEMBLY32)
   check_symbol_exists(__wasm64__ "" __WEBASSEMBLY64)
   if(__ARM)
     add_default_target_arch(arm)
   elseif(__AARCH64)
     add_default_target_arch(aarch64)
   elseif(__X86_64)
     add_default_target_arch(x86_64)
   elseif(__I686)
     add_default_target_arch(i686)
   elseif(__I386)
     add_default_target_arch(i386)
   elseif(__MIPS64) # must be checked before __MIPS
     add_default_target_arch(mips64)
   elseif(__MIPS)
     add_default_target_arch(mips)
+  elseif(__PPC64)
+    add_default_target_arch(powerpc64)
+  elseif(__PPC64LE)
+    add_default_target_arch(powerpc64le)
   elseif(__S390X)
     add_default_target_arch(s390x)
   elseif(__WEBASSEMBLY32)
     add_default_target_arch(wasm32)
   elseif(__WEBASSEMBLY64)
     add_default_target_arch(wasm64)
   endif()
 endmacro()

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

 
 if(APPLE)
   set(ARM64 arm64)
   set(ARM32 armv7 armv7k armv7s)
   set(X86_64 x86_64 x86_64h)
 endif()
 
 set(ALL_BUILTIN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
-    ${MIPS32} ${MIPS64} ${WASM32} ${WASM64})
+    ${MIPS32} ${MIPS64} ${PPC64} ${WASM32} ${WASM64})
 
 include(CompilerRTUtils)
 include(CompilerRTDarwinUtils)
 
 if(APPLE)
 
   find_darwin_sdk_dir(DARWIN_osx_SYSROOT macosx)
   find_darwin_sdk_dir(DARWIN_iossim_SYSROOT iphonesimulator)

compiler-rt/lib/builtins/CMakeLists.txt

 
 set(mips_SOURCES ${GENERIC_SOURCES})
 set(mipsel_SOURCES ${mips_SOURCES})
 set(mips64_SOURCES ${GENERIC_TF_SOURCES}
                    ${mips_SOURCES})
 set(mips64el_SOURCES ${GENERIC_TF_SOURCES}
                      ${mips_SOURCES})
 
+set(powerpc64_SOURCES
+  ppc/divtc3.c
+  ppc/fixtfdi.c
+  ppc/fixunstfdi.c
+  ppc/floatditf.c
+  ppc/floatunditf.c
+  ppc/gcc_qadd.c
+  ppc/gcc_qdiv.c
+  ppc/gcc_qmul.c
+  ppc/gcc_qsub.c
+  ppc/multc3.c
+  ${GENERIC_SOURCES})
+set(powerpc64le_SOURCES ${powerpc64_SOURCES})
+
 set(wasm32_SOURCES ${GENERIC_SOURCES})
 set(wasm64_SOURCES ${GENERIC_SOURCES})
 
 add_custom_target(builtins)
 set_target_properties(builtins PROPERTIES FOLDER "Compiler-RT Misc")
 
 if (APPLE)
   add_subdirectory(Darwin-excludes)

compiler-rt/lib/builtins/clear_cache.c

#elif defined(__aarch64__) && !defined(__APPLE__)
   for (addr = xstart; addr < xend; addr += dcache_line_size)
     __asm __volatile("dc cvau, %0" :: "r"(addr));
   __asm __volatile("dsb ish");
 
   const size_t icache_line_size = 4 << ((ctr_el0 >> 0) & 15);
   for (addr = xstart; addr < xend; addr += icache_line_size)
     __asm __volatile("ic ivau, %0" :: "r"(addr));
   __asm __volatile("isb sy");
-#elif defined (__powerpc64__) && defined(__LITTLE_ENDIAN__)
+#elif defined (__powerpc64__)
   const size_t line_size = 32;
   const size_t len = (uintptr_t)end - (uintptr_t)start;
 
   const uintptr_t mask = ~(line_size - 1);
   const uintptr_t start_line = ((uintptr_t)start) & mask;
   const uintptr_t end_line = ((uintptr_t)start + len + line_size - 1) & mask;
 
   for (uintptr_t line = start_line; line < end_line; line += line_size)