diff options
Diffstat (limited to 'compiler/atomic.go')
| -rw-r--r-- | compiler/atomic.go | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/compiler/atomic.go b/compiler/atomic.go index 7a931b7fe..c6938bdd0 100644 --- a/compiler/atomic.go +++ b/compiler/atomic.go @@ -52,30 +52,6 @@ func (b *builder) createAtomicOp(call *ssa.CallCommon) (llvm.Value, bool) { ptr := b.getValue(call.Args[0]) old := b.getValue(call.Args[1]) newVal := b.getValue(call.Args[2]) - if strings.HasSuffix(name, "64") { - if strings.HasPrefix(b.Triple, "thumb") { - // Work around a bug in LLVM, at least LLVM 11: - // https://reviews.llvm.org/D95891 - // Check for thumbv6m, thumbv7, thumbv7em, and perhaps others. - // See also: https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html - compareAndSwap := b.mod.NamedFunction("__sync_val_compare_and_swap_8") - if compareAndSwap.IsNil() { - // Declare the function if it isn't already declared. - i64Type := b.ctx.Int64Type() - fnType := llvm.FunctionType(i64Type, []llvm.Type{llvm.PointerType(i64Type, 0), i64Type, i64Type}, false) - compareAndSwap = llvm.AddFunction(b.mod, "__sync_val_compare_and_swap_8", fnType) - } - actualOldValue := b.CreateCall(compareAndSwap, []llvm.Value{ptr, old, newVal}, "") - // The __sync_val_compare_and_swap_8 function returns the old - // value. However, we shouldn't return the old value, we should - // return whether the compare/exchange was successful. This is - // easily done by comparing the returned (actual) old value with - // the expected old value passed to - // __sync_val_compare_and_swap_8. - swapped := b.CreateICmp(llvm.IntEQ, old, actualOldValue, "") - return swapped, true - } - } tuple := b.CreateAtomicCmpXchg(ptr, old, newVal, llvm.AtomicOrderingSequentiallyConsistent, llvm.AtomicOrderingSequentiallyConsistent, true) swapped := b.CreateExtractValue(tuple, 1, "") return swapped, true |