Disable clang optimization to boot up on arm64.
On arm64 devices, clang compiled lib64/libart.so repeatedly
crashes during boot up stage. That prevents a stable adb connection.
When optimization of BitVector::NumSetBits is disabled,
we can boot up to Android home screen, although some Apps
are still unstable.
This is a temporary workaround only for clang/llvm arm64 target,
to enable concurrent debugging on other bugs.
BUG: 19180814
Change-Id: Id82497ce4be0b2c30d36679d15394848d826f50c
diff --git a/runtime/base/bit_vector.cc b/runtime/base/bit_vector.cc
index 4390180..c3e24a7 100644
--- a/runtime/base/bit_vector.cc
+++ b/runtime/base/bit_vector.cc
@@ -276,6 +276,10 @@
}
}
+#if defined(__clang__) && defined(__ARM_64BIT_STATE)
+// b/19180814 When POPCOUNT is inlined, boot up failed on arm64 devices.
+__attribute__((optnone))
+#endif
uint32_t BitVector::NumSetBits(const uint32_t* storage, uint32_t end) {
uint32_t word_end = WordIndex(end);
uint32_t partial_word_bits = end & 0x1f;
