[AMDGPU] Diagnose unaligned atomic (#80322)

AMDGPU does not support unaligned atomics, therefore make the warning an
error.

This patch is transferred from

https://reviews.llvm.org/D99201

Author: yxsamliu

clang/lib/Driver/ToolChains/AMDGPU.cpp

@@ -829,6 +829,12 @@ void AMDGPUToolChain::addClangTargetOptions(
   }
 }
 
+void AMDGPUToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {
+  // AMDGPU does not support atomic lib call. Treat atomic alignment
+  // warnings as errors.
+  CC1Args.push_back("-Werror=atomic-alignment");
+}
+
 StringRef
 AMDGPUToolChain::getGPUArch(const llvm::opt::ArgList &DriverArgs) const {
   return getProcessorFromTargetID(

clang/lib/Driver/ToolChains/AMDGPU.h

@@ -121,6 +121,9 @@ class LLVM_LIBRARY_VISIBILITY AMDGPUToolChain : public Generic_ELF {
   /// Get GPU arch from -mcpu without checking.
   StringRef getGPUArch(const llvm::opt::ArgList &DriverArgs) const;
 
+  /// Common warning options shared by AMDGPU HIP, OpenCL and OpenMP toolchains.
+  /// Language specific warning options should go to derived classes.
+  void addClangWarningOptions(llvm::opt::ArgStringList &CC1Args) const override;
 };
 
 class LLVM_LIBRARY_VISIBILITY ROCMToolChain : public AMDGPUToolChain {

clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp

@@ -118,6 +118,7 @@ llvm::opt::DerivedArgList *AMDGPUOpenMPToolChain::TranslateArgs(
 
 void AMDGPUOpenMPToolChain::addClangWarningOptions(
     ArgStringList &CC1Args) const {
+  AMDGPUToolChain::addClangWarningOptions(CC1Args);
   HostTC.addClangWarningOptions(CC1Args);
 }
 

clang/lib/Driver/ToolChains/HIPAMD.cpp

@@ -308,6 +308,7 @@ Tool *HIPAMDToolChain::buildLinker() const {
 }
 
 void HIPAMDToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {
+  AMDGPUToolChain::addClangWarningOptions(CC1Args);
   HostTC.addClangWarningOptions(CC1Args);
 }
 

clang/test/Driver/amdgpu-openmp-toolchain.c

@@ -74,3 +74,7 @@
 // RUN: %clang -### -target x86_64-pc-linux-gnu -fopenmp --offload-arch=gfx90a \
 // RUN:   -O3 -nogpulib %s 2>&1 | FileCheck %s --check-prefix=CHECK-OPT
 // CHECK-OPT: clang-linker-wrapper{{.*}}"--opt-level=O3"
+
+// RUN:   %clang -### --target=x86_64-unknown-linux-gnu -emit-llvm -S -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx803 -nogpulib %s 2>&1 | FileCheck %s --check-prefix=CHECK-WARN-ATOMIC
+// CHECK-WARN-ATOMIC-NOT: "-cc1" "-triple" "x86_64-unknown-linux-gnu"{{.*}}"-Werror=atomic-alignment"
+// CHECK-WARN-ATOMIC: "-cc1" "-triple" "amdgcn-amd-amdhsa"{{.*}}"-Werror=atomic-alignment"

clang/test/Driver/amdgpu-toolchain-opencl.cl

@@ -32,3 +32,6 @@
 // RUN: %clang -### --target=amdgcn-amd-amdhsa-opencl -Wl,--unresolved-symbols=ignore-all -x cl -mcpu=fiji -nogpulib %s 2>&1 | FileCheck -check-prefix=CHK-LINK_UR %s
 // RUN: %clang -### --target=amdgcn-amd-amdhsa-opencl -Xlinker --unresolved-symbols=ignore-all -x cl -mcpu=fiji -nogpulib %s 2>&1 | FileCheck -check-prefix=CHK-LINK_UR %s
 // CHK-LINK_UR: ld.lld{{.*}} "--no-undefined"{{.*}} "--unresolved-symbols=ignore-all"
+
+// RUN: %clang -### --target=amdgcn-amd-amdhsa-opencl -x cl -c -emit-llvm -mcpu=fiji -nogpulib %s 2>&1 | FileCheck -check-prefix=CHECK-WARN-ATOMIC %s
+// CHECK-WARN-ATOMIC: "-cc1"{{.*}} "-Werror=atomic-alignment"

clang/test/Driver/hip-options.hip

@@ -229,3 +229,19 @@
 
 // RUN: %clang -fdriver-only -c -Werror --target=x86_64-unknown-linux-gnu -nogpuinc -nogpulib -fno-offload-uniform-block \
 // RUN:   -foffload-uniform-block --cuda-gpu-arch=gfx906 %s 2>&1 | count 0
+
+// Check -Werror=atomic-alignment is passed for amdpu by default.
+
+// RUN: %clang -### --target=x86_64-unknown-linux-gnu -nogpuinc -nogpulib \
+// RUN:   --cuda-gpu-arch=gfx906 %s 2>&1 | FileCheck -check-prefix=WARN-ATOMIC %s
+// WARN-ATOMIC: clang{{.*}} "-triple" "amdgcn-amd-amdhsa" {{.*}} "-Werror=atomic-alignment"
+// WARN-ATOMIC-NOT: clang{{.*}} "-triple" "x86_64-unknown-linux-gnu" {{.*}} "-Werror=atomic-alignment"
+
+// Check the default -Werror=atomic-alignment can be overridden.
+
+// RUN: %clang -### --target=x86_64-unknown-linux-gnu -nogpuinc -nogpulib \
+// RUN:   --cuda-gpu-arch=gfx906 -Xarch_device -Wno-error=atomic-alignment %s \
+// RUN:   2>&1 | FileCheck -check-prefix=NO-WARN-ATOMIC %s
+// NO-WARN-ATOMIC: clang{{.*}} "-triple" "amdgcn-amd-amdhsa" {{.*}} "-Werror=atomic-alignment" {{.*}} "-Wno-error=atomic-alignment"
+// NO-WARN-ATOMIC-NOT: clang{{.*}} "-triple" "x86_64-unknown-linux-gnu" {{.*}} "-Werror=atomic-alignment"
+// NO-WARN-ATOMIC-NOT: clang{{.*}} "-triple" "x86_64-unknown-linux-gnu" {{.*}} "-Wno-error=atomic-alignment"