[clang][LoongArch] Set MaxAtomicInlineWidth and MaxAtomicPromoteWidth for LoongArch

[SixWeining]

clang/test/CodeGen/LoongArch/atomics.c

3

Nit: --

5

ditto

[wangleiat]

Address @SixWeining's comment.

[wangleiat]

Thanks. @SixWeining

[thakis]

This seems to break check-clang: http://45.33.8.238/linux/88687/step_7.txt

Please take a look and revert for now if it takes a while to fix.

[SixWeining]

This breaks test: Preprocessor/init-loongarch.c

[wangleiat]

In D135526#3849117, @thakis wrote:

This seems to break check-clang: http://45.33.8.238/linux/88687/step_7.txt

Please take a look and revert for now if it takes a while to fix.

Thanks a lot, I'll fix it right away.

[wangleiat]

Fix Preprocessor/init-loongarch.c test failed.

clang/lib/Basic/Targets/LoongArch.h

public:
 
   bool setABI(const std::string &Name) override {
     if (Name == "ilp32d" || Name == "ilp32f" || Name == "ilp32s") {
       ABI = Name;
       return true;
     }
     return false;
   }
+  void setMaxAtomicWidth() override {
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 32;
+  }
 };
 
 class LLVM_LIBRARY_VISIBILITY LoongArch64TargetInfo
     : public LoongArchTargetInfo {
 public:
   LoongArch64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
       : LoongArchTargetInfo(Triple, Opts) {
     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
     IntMaxType = Int64Type = SignedLong;
     resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n64-S128");
     // TODO: select appropriate ABI.
     setABI("lp64d");
   }
 
   bool setABI(const std::string &Name) override {
     if (Name == "lp64d" || Name == "lp64f" || Name == "lp64s") {
       ABI = Name;
       return true;
     }
     return false;
   }
+  void setMaxAtomicWidth() override {
+    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
+  }
 };
 } // end namespace targets
 } // end namespace clang
 
 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H

clang/test/CodeGen/LoongArch/atomics.c

+// RUN: %clang_cc1 -triple loongarch32 -O1 -emit-llvm %s -o - \
+// RUN:   | FileCheck %s --check-prefix=LA32
+// RUN: %clang_cc1 -triple loongarch64 -O1 -emit-llvm %s -o - \
+// RUN:   | FileCheck %s --check-prefix=LA64
+
+/// This test demonstrates that MaxAtomicInlineWidth is set appropriately.
+
+#include <stdatomic.h>
+#include <stdint.h>
+
+void test_i8_atomics(_Atomic(int8_t) * a, int8_t b) {
+  // LA32: load atomic i8, ptr %a seq_cst, align 1
+  // LA32: store atomic i8 %b, ptr %a seq_cst, align 1
+  // LA32: atomicrmw add ptr %a, i8 %b seq_cst
+  // LA64: load atomic i8, ptr %a seq_cst, align 1
+  // LA64: store atomic i8 %b, ptr %a seq_cst, align 1
+  // LA64: atomicrmw add ptr %a, i8 %b seq_cst
+  __c11_atomic_load(a, memory_order_seq_cst);
+  __c11_atomic_store(a, b, memory_order_seq_cst);
+  __c11_atomic_fetch_add(a, b, memory_order_seq_cst);
+}
+
+void test_i32_atomics(_Atomic(int32_t) * a, int32_t b) {
+  // LA32: load atomic i32, ptr %a seq_cst, align 4
+  // LA32: store atomic i32 %b, ptr %a seq_cst, align 4
+  // LA32: atomicrmw add ptr %a, i32 %b seq_cst
+  // LA64: load atomic i32, ptr %a seq_cst, align 4
+  // LA64: store atomic i32 %b, ptr %a seq_cst, align 4
+  // LA64: atomicrmw add ptr %a, i32 %b seq_cst
+  __c11_atomic_load(a, memory_order_seq_cst);
+  __c11_atomic_store(a, b, memory_order_seq_cst);
+  __c11_atomic_fetch_add(a, b, memory_order_seq_cst);
+}
+
+void test_i64_atomics(_Atomic(int64_t) * a, int64_t b) {
+  // LA32: call i64 @__atomic_load_8
+  // LA32: call void @__atomic_store_8
+  // LA32: call i64 @__atomic_fetch_add_8
+  // LA64: load atomic i64, ptr %a seq_cst, align 8
+  // LA64: store atomic i64 %b, ptr %a seq_cst, align 8
+  // LA64: atomicrmw add ptr %a, i64 %b seq_cst
+  __c11_atomic_load(a, memory_order_seq_cst);
+  __c11_atomic_store(a, b, memory_order_seq_cst);
+  __c11_atomic_fetch_add(a, b, memory_order_seq_cst);
+}