dawn-cmake/test/tint/statements/discard/atomic_cmpxchg.wgsl.expected.msl

#include <metal_stdlib>

using namespace metal;

struct atomic_compare_exchange_resulti32 {
  int old_value;
  bool exchanged;
};
atomic_compare_exchange_resulti32 atomicCompareExchangeWeak_1(device atomic_int* atomic, int compare, int value) {
  int old_value = compare;
  bool exchanged = atomic_compare_exchange_weak_explicit(atomic, &old_value, value, memory_order_relaxed, memory_order_relaxed);
  return {old_value, exchanged};
}

struct tint_private_vars_struct {
  bool tint_discarded;
};

struct tint_symbol_2 {
  int old_value;
  bool exchanged;
};

struct tint_symbol {
  int value [[color(0)]];
};

int foo_inner(thread tint_private_vars_struct* const tint_private_vars, device atomic_int* const tint_symbol_4) {
  (*(tint_private_vars)).tint_discarded = true;
  int x = 0;
  tint_symbol_2 tint_symbol_1 = {};
  if (!((*(tint_private_vars)).tint_discarded)) {
    atomic_compare_exchange_resulti32 const tint_symbol_3 = atomicCompareExchangeWeak_1(tint_symbol_4, 0, 1);
    tint_symbol_1.old_value = tint_symbol_3.old_value;
    tint_symbol_1.exchanged = tint_symbol_3.exchanged;
  }
  tint_symbol_2 const result = tint_symbol_1;
  if (result.exchanged) {
    x = result.old_value;
  }
  return x;
}

fragment tint_symbol foo(device atomic_int* tint_symbol_5 [[buffer(0)]]) {
  thread tint_private_vars_struct tint_private_vars = {};
  tint_private_vars.tint_discarded = false;
  int const inner_result = foo_inner(&(tint_private_vars), tint_symbol_5);
  tint_symbol wrapper_result = {};
  wrapper_result.value = inner_result;
  if (tint_private_vars.tint_discarded) {
    discard_fragment();
  }
  return wrapper_result;
}