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improve cmpxchg

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* remove @cmpxchg, add @cmpxchgWeak and @cmpxchgStrong
   - See explanations in the langref.
 * add operand type as first parameter
 * return type is ?T where T is the operand type

closes #461
This commit is contained in:
Andrew Kelley
2018-04-18 12:16:42 -04:00
parent 96ebd8b23b
commit f1f998e071
8 changed files with 148 additions and 63 deletions
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8
src/zig_llvm.cpp
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@@ -765,10 +765,12 @@ static AtomicOrdering mapFromLLVMOrdering(LLVMAtomicOrdering Ordering) {
LLVMValueRef ZigLLVMBuildCmpXchg(LLVMBuilderRef builder, LLVMValueRef ptr, LLVMValueRef cmp,
LLVMValueRef new_val, LLVMAtomicOrdering success_ordering,
LLVMAtomicOrdering failure_ordering)
LLVMAtomicOrdering failure_ordering, bool is_weak)
{
return wrap(unwrap(builder)->CreateAtomicCmpXchg(unwrap(ptr), unwrap(cmp), unwrap(new_val),
mapFromLLVMOrdering(success_ordering), mapFromLLVMOrdering(failure_ordering)));
AtomicCmpXchgInst *inst = unwrap(builder)->CreateAtomicCmpXchg(unwrap(ptr), unwrap(cmp),
unwrap(new_val), mapFromLLVMOrdering(success_ordering), mapFromLLVMOrdering(failure_ordering));
inst->setWeak(is_weak);
return wrap(inst);
}
LLVMValueRef ZigLLVMBuildNSWShl(LLVMBuilderRef builder, LLVMValueRef LHS, LLVMValueRef RHS,