diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 0b0fff739eb..f96eaf9cd43 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -92,6 +92,13 @@ static cl::opt<bool> MulConstantOptimization( "SHIFT, LEA, etc."), cl::Hidden); +static cl::opt<bool> ExperimentalUnorderedISEL( + "x86-experimental-unordered-atomic-isel", cl::init(false), + cl::desc("Use LoadSDNode and StoreSDNode instead of " + "AtomicSDNode for unordered atomic loads and " + "stores respectively."), + cl::Hidden); + /// Call this when the user attempts to do something unsupported, like /// returning a double without SSE2 enabled on x86_64. This is not fatal, unlike /// report_fatal_error, so calling code should attempt to recover without @@ -26493,6 +26500,18 @@ X86TargetLowering::lowerIdempotentRMWIntoFencedLoad(AtomicRMWInst *AI) const { return Loaded; } +bool X86TargetLowering::lowerAtomicStoreAsStoreSDNode(const StoreInst &SI) const { + if (!SI.isUnordered()) + return false; + return ExperimentalUnorderedISEL; +} +bool X86TargetLowering::lowerAtomicLoadAsLoadSDNode(const LoadInst &LI) const { + if (!LI.isUnordered()) + return false; + return ExperimentalUnorderedISEL; +} + + /// Emit a locked operation on a stack location which does not change any /// memory location, but does involve a lock prefix. Location is chosen to be /// a) very likely accessed only by a single thread to minimize cache traffic, |
