[AMDGPU] Do not emit arch dependent macros with unspecified cpu (llvm#79660)

Summary:
Currently, the AMDGPU toolchain accepts not passing `-mcpu` as a means
to create a sort of "generic" IR. The resulting IR will not contain any
target dependent attributes and can then be inserted into another
program via `-mlink-builtin-bitcode` to inherit its attributes.

However, there are a handful of macros that can leak incorrect
information when compiling for an unspecified architecture. Currently,
things like the wavefront size will default to 64, which is actually
variable. We should not expose these macros unless it is known.

Author: jhuber6

clang/lib/Basic/Targets/AMDGPU.cpp

@@ -274,30 +274,29 @@ void AMDGPUTargetInfo::getTargetDefines(const LangOptions &Opts,
   else
     Builder.defineMacro("__R600__");
 
-  if (GPUKind != llvm::AMDGPU::GK_NONE) {
-    StringRef CanonName = isAMDGCN(getTriple()) ?
-      getArchNameAMDGCN(GPUKind) : getArchNameR600(GPUKind);
-    Builder.defineMacro(Twine("__") + Twine(CanonName) + Twine("__"));
-    // Emit macros for gfx family e.g. gfx906 -> __GFX9__, gfx1030 -> __GFX10___
-    if (isAMDGCN(getTriple())) {
-      assert(CanonName.starts_with("gfx") && "Invalid amdgcn canonical name");
-      Builder.defineMacro(Twine("__") + Twine(CanonName.drop_back(2).upper()) +
-                          Twine("__"));
-    }
-    if (isAMDGCN(getTriple())) {
-      Builder.defineMacro("__amdgcn_processor__",
-                          Twine("\"") + Twine(CanonName) + Twine("\""));
-      Builder.defineMacro("__amdgcn_target_id__",
-                          Twine("\"") + Twine(*getTargetID()) + Twine("\""));
-      for (auto F : getAllPossibleTargetIDFeatures(getTriple(), CanonName)) {
-        auto Loc = OffloadArchFeatures.find(F);
-        if (Loc != OffloadArchFeatures.end()) {
-          std::string NewF = F.str();
-          std::replace(NewF.begin(), NewF.end(), '-', '_');
-          Builder.defineMacro(Twine("__amdgcn_feature_") + Twine(NewF) +
-                                  Twine("__"),
-                              Loc->second ? "1" : "0");
-        }
+  if (GPUKind == llvm::AMDGPU::GK_NONE)
+    return;
+
+  StringRef CanonName = isAMDGCN(getTriple()) ? getArchNameAMDGCN(GPUKind)
+                                              : getArchNameR600(GPUKind);
+  Builder.defineMacro(Twine("__") + Twine(CanonName) + Twine("__"));
+  // Emit macros for gfx family e.g. gfx906 -> __GFX9__, gfx1030 -> __GFX10___
+  if (isAMDGCN(getTriple())) {
+    assert(CanonName.starts_with("gfx") && "Invalid amdgcn canonical name");
+    Builder.defineMacro(Twine("__") + Twine(CanonName.drop_back(2).upper()) +
+                        Twine("__"));
+    Builder.defineMacro("__amdgcn_processor__",
+                        Twine("\"") + Twine(CanonName) + Twine("\""));
+    Builder.defineMacro("__amdgcn_target_id__",
+                        Twine("\"") + Twine(*getTargetID()) + Twine("\""));
+    for (auto F : getAllPossibleTargetIDFeatures(getTriple(), CanonName)) {
+      auto Loc = OffloadArchFeatures.find(F);
+      if (Loc != OffloadArchFeatures.end()) {
+        std::string NewF = F.str();
+        std::replace(NewF.begin(), NewF.end(), '-', '_');
+        Builder.defineMacro(Twine("__amdgcn_feature_") + Twine(NewF) +
+                                Twine("__"),
+                            Loc->second ? "1" : "0");
       }
     }
   }

clang/test/CodeGenOpenCL/builtins-amdgcn-wave64.cl

@@ -44,6 +44,6 @@ void test_read_exec_hi(global ulong* out) {
   *out = __builtin_amdgcn_read_exec_hi();
 }
 
-#if __AMDGCN_WAVEFRONT_SIZE != 64
+#if defined(__AMDGCN_WAVEFRONT_SIZE__) && __AMDGCN_WAVEFRONT_SIZE__ != 64
 #error Wrong wavesize detected
 #endif

clang/test/Preprocessor/predefined-arch-macros.c

@@ -4294,13 +4294,20 @@
 
 // Begin amdgcn tests ----------------
 
-// RUN: %clang -march=amdgcn -E -dM %s -o - 2>&1 \
+// RUN: %clang -mcpu=gfx803 -E -dM %s -o - 2>&1 \
+// RUN:     -target amdgcn-unknown-unknown \
+// RUN:   | FileCheck -match-full-lines %s -check-prefixes=CHECK_AMDGCN,CHECK_AMDGCN_803
+// RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target amdgcn-unknown-unknown \
-// RUN:   | FileCheck -match-full-lines %s -check-prefix=CHECK_AMDGCN
+// RUN:   | FileCheck -match-full-lines %s -check-prefixes=CHECK_AMDGCN,CHECK_AMDGCN_NONE
 // CHECK_AMDGCN: #define __AMDGCN__ 1
-// CHECK_AMDGCN: #define __HAS_FMAF__ 1
-// CHECK_AMDGCN: #define __HAS_FP64__ 1
-// CHECK_AMDGCN: #define __HAS_LDEXPF__ 1
+// CHECK_AMDGCN_803: #define __HAS_FMAF__ 1
+// CHECK_AMDGCN_803: #define __HAS_FP64__ 1
+// CHECK_AMDGCN_803: #define __HAS_LDEXPF__ 1
+// CHECK_AMDGCN_NONE-NOT: #define __HAS_FMAF__
+// CHECK_AMDGCN_NONE-NOT: #define __HAS_FP64__
+// CHECK_AMDGCN_NONE-NOT: #define __HAS_LDEXPF__
+// CHECK_AMDGCN_NONE-NOT: #define __AMDGCN_WAVEFRONT_SIZE__
 
 // Begin r600 tests ----------------