[OPENMP] Deal with additional store inserted by Clang under -fno-PIC for PowerPC.

Changing the default from -fPIC to -fno-PIC on PowerPC exposed an issue in
OpenMP for PowerPC.
The issue is reported here:
https://bugs.llvm.org/show_bug.cgi?id=40082

This is a fix for that issue.
Also removed the XFAIL from the two tests that were failing under -fno-PIC.

Differential Revision: https://reviews.llvm.org/D56286

llvm-svn: 355229

openmp/runtime/test/lit.cfg

@@ -55,6 +55,7 @@ if config.has_libatomic:
     libs += " -latomic"
 
 # Allow REQUIRES / UNSUPPORTED / XFAIL to work
+config.target_triple = [ ]
 for feature in config.test_compiler_features:
     config.available_features.add(feature)
 

openmp/runtime/test/lit.site.cfg.in

@@ -1,6 +1,5 @@
 @AUTO_GEN_COMMENT@
 
-config.target_triple = "@TARGET_TRIPLE@"
 config.test_c_compiler = "@OPENMP_TEST_C_COMPILER@"
 config.test_cxx_compiler = "@OPENMP_TEST_CXX_COMPILER@"
 config.test_compiler_features = @OPENMP_TEST_COMPILER_FEATURES@

openmp/runtime/test/ompt/callback.h

@@ -154,11 +154,12 @@ ompt_label_##id:
          ompt_get_thread_data()->value, ((char *)addr) - 1, ((char *)addr) - 4)
 #elif KMP_ARCH_PPC64
 // On Power the NOP instruction is 4 bytes long. In addition, the compiler
-// inserts an LD instruction which accounts for another 4 bytes. In contrast to
-// X86 this instruction is always there, even for void runtime functions.
+// inserts a second NOP instruction (another 4 bytes). For non-void runtime
+// functions Clang inserts a STW instruction (but only if compiling under
+// -fno-PIC which will be the default with Clang 8.0, another 4 bytes).
 #define print_possible_return_addresses(addr) \
-  printf("%" PRIu64 ": current_address=%p\n", ompt_get_thread_data()->value, \
-         ((char *)addr) - 8)
+  printf("%" PRIu64 ": current_address=%p or %p\n", ompt_get_thread_data()->value, \
+         ((char *)addr) - 8, ((char *)addr) - 12)
 #elif KMP_ARCH_AARCH64
 // On AArch64 the NOP instruction is 4 bytes long, can be followed by inserted
 // store instruction (another 4 bytes long).

openmp/runtime/test/ompt/misc/control_tool.c

@@ -1,7 +1,6 @@
 // RUN: %libomp-compile-and-run | FileCheck %s
 // REQUIRES: ompt
 // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7
-// XFAIL: powerpc64le, ppc64le
 #define TEST_NEED_PRINT_FRAME_FROM_OUTLINED_FN
 #include "callback.h"
 #include <omp.h>

openmp/runtime/test/ompt/synchronization/taskwait.c

@@ -1,7 +1,6 @@
 // RUN: %libomp-compile-and-run | %sort-threads | FileCheck %s
 // REQUIRES: ompt
 // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7
-// XFAIL: powerpc64le, ppc64le
 #include "callback.h"
 #include <omp.h>