+static LLVMValueRef emit_ssbo_comp_swap_64(struct ac_nir_context *ctx,
+ LLVMValueRef descriptor,
+ LLVMValueRef offset,
+ LLVMValueRef compare,
+ LLVMValueRef exchange)
+{
+ LLVMBasicBlockRef start_block = NULL, then_block = NULL;
+ if (ctx->abi->robust_buffer_access) {
+ LLVMValueRef size = ac_llvm_extract_elem(&ctx->ac, descriptor, 2);
+
+ LLVMValueRef cond = LLVMBuildICmp(ctx->ac.builder, LLVMIntULT, offset, size, "");
+ start_block = LLVMGetInsertBlock(ctx->ac.builder);
+
+ ac_build_ifcc(&ctx->ac, cond, -1);
+
+ then_block = LLVMGetInsertBlock(ctx->ac.builder);
+ }
+
+ LLVMValueRef ptr_parts[2] = {
+ ac_llvm_extract_elem(&ctx->ac, descriptor, 0),
+ LLVMBuildAnd(ctx->ac.builder,
+ ac_llvm_extract_elem(&ctx->ac, descriptor, 1),
+ LLVMConstInt(ctx->ac.i32, 65535, 0), "")
+ };
+
+ ptr_parts[1] = LLVMBuildTrunc(ctx->ac.builder, ptr_parts[1], ctx->ac.i16, "");
+ ptr_parts[1] = LLVMBuildSExt(ctx->ac.builder, ptr_parts[1], ctx->ac.i32, "");
+
+ offset = LLVMBuildZExt(ctx->ac.builder, offset, ctx->ac.i64, "");
+
+ LLVMValueRef ptr = ac_build_gather_values(&ctx->ac, ptr_parts, 2);
+ ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, ctx->ac.i64, "");
+ ptr = LLVMBuildAdd(ctx->ac.builder, ptr, offset, "");
+ ptr = LLVMBuildIntToPtr(ctx->ac.builder, ptr, LLVMPointerType(ctx->ac.i64, AC_ADDR_SPACE_GLOBAL), "");
+
+ LLVMValueRef result = ac_build_atomic_cmp_xchg(&ctx->ac, ptr, compare, exchange, "singlethread-one-as");
+ result = LLVMBuildExtractValue(ctx->ac.builder, result, 0, "");
+
+ if (ctx->abi->robust_buffer_access) {
+ ac_build_endif(&ctx->ac, -1);
+
+ LLVMBasicBlockRef incoming_blocks[2] = {
+ start_block,
+ then_block,
+ };
+
+ LLVMValueRef incoming_values[2] = {
+ LLVMConstInt(ctx->ac.i64, 0, 0),
+ result,
+ };
+ LLVMValueRef ret = LLVMBuildPhi(ctx->ac.builder, ctx->ac.i64, "");
+ LLVMAddIncoming(ret, incoming_values, incoming_blocks, 2);
+ return ret;
+ } else {
+ return result;
+ }
+}
+