[libFuzzer] use __attribute__((target("popcnt"))) only on x86_64

llvm-svn: 279601

llvm/lib/Fuzzer/CMakeLists.txt

@@ -1,6 +1,6 @@
 set(LIBFUZZER_FLAGS_BASE "${CMAKE_CXX_FLAGS}")
 # Disable the coverage and sanitizer instrumentation for the fuzzer itself.
-set(CMAKE_CXX_FLAGS "${LIBFUZZER_FLAGS_BASE} -mpopcnt -fno-sanitize=all -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters -Werror")
+set(CMAKE_CXX_FLAGS "${LIBFUZZER_FLAGS_BASE} -fno-sanitize=all -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters -Werror")
 if( LLVM_USE_SANITIZE_COVERAGE )
   if(NOT "${LLVM_USE_SANITIZER}" STREQUAL "Address")
     message(FATAL_ERROR

llvm/lib/Fuzzer/FuzzerInternal.h

@@ -26,10 +26,6 @@
 #include <unordered_set>
 #include <vector>
 
-#include "FuzzerExtFunctions.h"
-#include "FuzzerInterface.h"
-#include "FuzzerValueBitMap.h"
-
 // Platform detection.
 #ifdef __linux__
 #define LIBFUZZER_LINUX 1
@@ -41,6 +37,16 @@
 #error "Support for your platform has not been implemented"
 #endif
 
+#ifdef __x86_64
+#define ATTRIBUTE_TARGET_POPCNT __attribute__((target("popcnt")))
+#else
+#define ATTRIBUTE_TARGET_POPCNT
+#endif
+
+#include "FuzzerExtFunctions.h"
+#include "FuzzerInterface.h"
+#include "FuzzerValueBitMap.h"
+
 namespace fuzzer {
 
 typedef int (*UserCallback)(const uint8_t *Data, size_t Size);

llvm/lib/Fuzzer/FuzzerTraceState.cpp

@@ -574,7 +574,7 @@ static void AddValueForStrcmp(void *caller_pc, const char *s1, const char *s2,
   VP.AddValue((PC & 4095) | (LastSameByte << 12));
 }
 
-__attribute__((target("popcnt")))
+ATTRIBUTE_TARGET_POPCNT
 static void AddValueForCmp(void *PCptr, uint64_t Arg1, uint64_t Arg2) {
   if (Arg1 == Arg2)
     return;

llvm/lib/Fuzzer/FuzzerValueBitMap.h

@@ -34,7 +34,7 @@ struct ValueBitMap {
 
   // Merges 'Other' into 'this', clears 'Other',
   // returns the number of set bits in 'this'.
-  __attribute__((target("popcnt")))
+  ATTRIBUTE_TARGET_POPCNT
   size_t MergeFrom(ValueBitMap &Other) {
     uintptr_t Res = 0;
     for (size_t i = 0; i < kMapSizeInWords; i++) {