Index: compiler-rt/cmake/Modules/CompilerRTUtils.cmake
===================================================================
--- compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+++ compiler-rt/cmake/Modules/CompilerRTUtils.cmake
@@ -167,6 +167,8 @@
   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)
@@ -184,6 +186,10 @@
     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)
Index: compiler-rt/cmake/base-config-ix.cmake
===================================================================
--- compiler-rt/cmake/base-config-ix.cmake
+++ compiler-rt/cmake/base-config-ix.cmake
@@ -4,6 +4,7 @@
 # runtime libraries.
 
 include(CheckIncludeFile)
+include(TestBigEndian)
 check_include_file(unwind.h HAVE_UNWIND_H)
 
 # Top level target used to build all compiler-rt libraries.
@@ -180,6 +181,10 @@
       test_target_arch(aarch32 "" "-march=armv8-a")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "aarch64")
       test_target_arch(aarch64 "" "-march=armv8-a")
+    elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "powerpc64")
+      test_target_arch(powerpc64 "" "--target=powerpc64-unknown-unknown")
+    elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "powerpc64le")
+      test_target_arch(powerpc64le "" "--target=powerpc64le-unknown-unknown")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "wasm32")
       test_target_arch(wasm32 "" "--target=wasm32-unknown-unknown")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "wasm64")
Index: compiler-rt/cmake/builtin-config-ix.cmake
===================================================================
--- compiler-rt/cmake/builtin-config-ix.cmake
+++ compiler-rt/cmake/builtin-config-ix.cmake
@@ -40,7 +40,7 @@
 endif()
 
 set(ALL_BUILTIN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
-    ${MIPS32} ${MIPS64} ${WASM32} ${WASM64})
+    ${MIPS32} ${MIPS64} ${PPC64} ${WASM32} ${WASM64})
 
 include(CompilerRTUtils)
 include(CompilerRTDarwinUtils)
Index: compiler-rt/lib/builtins/CMakeLists.txt
===================================================================
--- compiler-rt/lib/builtins/CMakeLists.txt
+++ compiler-rt/lib/builtins/CMakeLists.txt
@@ -458,6 +458,20 @@
 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})
 
Index: compiler-rt/test/builtins/Unit/fixunsxfti_test.c
===================================================================
--- compiler-rt/test/builtins/Unit/fixunsxfti_test.c
+++ compiler-rt/test/builtins/Unit/fixunsxfti_test.c
@@ -2,7 +2,7 @@
 // XFAIL: aarch64
 // test fails for aarch64 (see pr32260)
 
-// UNSUPPORTED: mips
+// UNSUPPORTED: mips, powerpc64, powerpc64le
 
 //===-- fixunsxfti_test.c - Test __fixunsxfti -----------------------------===//
 //
Index: compiler-rt/test/builtins/Unit/fixxfti_test.c
===================================================================
--- compiler-rt/test/builtins/Unit/fixxfti_test.c
+++ compiler-rt/test/builtins/Unit/fixxfti_test.c
@@ -2,7 +2,7 @@
 // XFAIL: aarch64
 // test fails for aarch64 (see pr32260)
 
-// UNSUPPORTED: mips
+// UNSUPPORTED: mips, powerpc64, powerpc64le
 
 //===-- fixxfti_test.c - Test __fixxfti -----------------------------------===//
 //
Index: compiler-rt/test/builtins/Unit/floattixf_test.c
===================================================================
--- compiler-rt/test/builtins/Unit/floattixf_test.c
+++ compiler-rt/test/builtins/Unit/floattixf_test.c
@@ -2,7 +2,7 @@
 // XFAIL: aarch64
 // test fails for aarch64 (see pr32260)
 
-// UNSUPPORTED: mips
+// UNSUPPORTED: mips, powerpc64, powerpc64le
 
 //===-- floattixf.c - Test __floattixf ------------------------------------===//
 //
Index: compiler-rt/test/builtins/Unit/floatuntixf_test.c
===================================================================
--- compiler-rt/test/builtins/Unit/floatuntixf_test.c
+++ compiler-rt/test/builtins/Unit/floatuntixf_test.c
@@ -2,7 +2,7 @@
 // XFAIL: aarch64
 // test fails for aarch64 (see pr32260)
 
-// UNSUPPORTED: mips
+// UNSUPPORTED: mips, powerpc64, powerpc64le
 
 //===-- floatuntixf.c - Test __floatuntixf --------------------------------===//
 //