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| author | Matt Arsenault <Matthew.Arsenault@amd.com> | 2019-01-22 18:18:02 +0000 |
|---|---|---|
| committer | Matt Arsenault <Matthew.Arsenault@amd.com> | 2019-01-22 18:18:02 +0000 |
| commit | 39508331ef7e9417afc43f634c0ef23eb768d974 (patch) | |
| tree | 37138807947246687637b0b5eccc66f6b5b9ed61 /llvm/lib/Target/RISCV/RISCVISelLowering.cpp | |
| parent | 1c5d23f1405994da05697b3b66c9f5a32735fdc3 (diff) | |
| download | bcm5719-llvm-39508331ef7e9417afc43f634c0ef23eb768d974.tar.gz bcm5719-llvm-39508331ef7e9417afc43f634c0ef23eb768d974.zip | |
Reapply "IR: Add fp operations to atomicrmw"
This reapplies commits r351778 and r351782 with
RISCV test fixes.
llvm-svn: 351850
Diffstat (limited to 'llvm/lib/Target/RISCV/RISCVISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/RISCV/RISCVISelLowering.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp index 95943f3dbaf..16591c4208c 100644 --- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp +++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp @@ -1724,6 +1724,12 @@ Instruction *RISCVTargetLowering::emitTrailingFence(IRBuilder<> &Builder, TargetLowering::AtomicExpansionKind RISCVTargetLowering::shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const { + // atomicrmw {fadd,fsub} must be expanded to use compare-exchange, as floating + // point operations can't be used in an lr/sc sequence without breaking the + // forward-progress guarantee. + if (AI->isFloatingPointOperation()) + return AtomicExpansionKind::CmpXChg; + unsigned Size = AI->getType()->getPrimitiveSizeInBits(); if (Size == 8 || Size == 16) return AtomicExpansionKind::MaskedIntrinsic; |
