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| author | Saleem Abdulrasool <compnerd@compnerd.org> | 2019-06-25 21:43:34 +0000 |
|---|---|---|
| committer | Saleem Abdulrasool <compnerd@compnerd.org> | 2019-06-25 21:43:34 +0000 |
| commit | c32d307a49f5255602e7543e64e6c38a7f536abc (patch) | |
| tree | ecb2cebdebc9b7ac9f12e781fc91ac962769328a | |
| parent | c8e450a9179cf699133a8f00ea3b08808b7a4c38 (diff) | |
| download | bcm5719-llvm-c32d307a49f5255602e7543e64e6c38a7f536abc.tar.gz bcm5719-llvm-c32d307a49f5255602e7543e64e6c38a7f536abc.zip | |
android: enable double-word CAS on x64
The android target assumes that for the x86_64 target, the CPU supports SSE4.2
and popcnt. This implies that the CPU is Nehalem or newer. This should be
sufficiently new to provide the double word compare and exchange instruction.
This allows us to directly lower `__sync_val_compare_and_swap_16` to a `cmpxchg16b`.
It appears that the libatomic in android's NDK does not provide the
implementation for lowering calls to the library function.
llvm-svn: 364352
| -rw-r--r-- | clang/lib/Driver/ToolChains/Arch/X86.cpp | 1 | ||||
| -rw-r--r-- | clang/test/Driver/clang-translation.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/Driver/ToolChains/Arch/X86.cpp b/clang/lib/Driver/ToolChains/Arch/X86.cpp index a6606fd078e..2e75039bf0d 100644 --- a/clang/lib/Driver/ToolChains/Arch/X86.cpp +++ b/clang/lib/Driver/ToolChains/Arch/X86.cpp @@ -135,6 +135,7 @@ void x86::getX86TargetFeatures(const Driver &D, const llvm::Triple &Triple, if (ArchType == llvm::Triple::x86_64) { Features.push_back("+sse4.2"); Features.push_back("+popcnt"); + Features.push_back("+mcx16"); } else Features.push_back("+ssse3"); } diff --git a/clang/test/Driver/clang-translation.c b/clang/test/Driver/clang-translation.c index 25a54036b7e..0054535115a 100644 --- a/clang/test/Driver/clang-translation.c +++ b/clang/test/Driver/clang-translation.c @@ -318,6 +318,7 @@ // ANDROID-X86_64: "-target-cpu" "x86-64" // ANDROID-X86_64: "-target-feature" "+sse4.2" // ANDROID-X86_64: "-target-feature" "+popcnt" +// ANDROID-X86_64: "-target-feature" "+mcx16" // RUN: %clang -target mips-linux-gnu -### -S %s 2>&1 | \ // RUN: FileCheck -check-prefix=MIPS %s |
