[llvm] [NVPTX] Add support for maxclusterrank in launch_bounds (PR #66496)
via llvm-commits
llvm-commits at lists.llvm.org
Fri Sep 15 04:25:16 PDT 2023
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
<details>
<summary>Changes</summary>
Since SM_90 CUDA supports specifying additional argument to the launch_bounds attribute: maxBlocksPerCluster, to express the maximum number of CTAs that can be part of the cluster. See: https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#cluster-dimension-directives-maxclusterrank and
https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#launch-bounds for details.
--
Patch is 24.44 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/66496.diff
13 Files Affected:
- (modified) clang/include/clang/Basic/Attr.td (+2-1)
- (modified) clang/include/clang/Basic/DiagnosticSemaKinds.td (+4)
- (modified) clang/include/clang/Sema/Sema.h (+3-2)
- (modified) clang/lib/CodeGen/Targets/NVPTX.cpp (+10-2)
- (modified) clang/lib/Parse/ParseOpenMP.cpp (+2-1)
- (modified) clang/lib/Sema/SemaDeclAttr.cpp (+39-7)
- (modified) clang/lib/Sema/SemaTemplateInstantiateDecl.cpp (+9-1)
- (modified) clang/test/CodeGenCUDA/launch-bounds.cu (+69)
- (modified) clang/test/SemaCUDA/launch_bounds.cu (+3-1)
- (added) clang/test/SemaCUDA/launch_bounds_sm_90.cu (+45)
- (modified) llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp (+36-43)
- (modified) llvm/lib/Target/NVPTX/NVPTXUtilities.cpp (+4)
- (modified) llvm/lib/Target/NVPTX/NVPTXUtilities.h (+1)
<pre>
diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
index c95db7e8049d47a..3c51261bd3eb081 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -1267,7 +1267,8 @@ def CUDAInvalidTarget : InheritableAttr {
def CUDALaunchBounds : InheritableAttr {
let Spellings = [GNU<"launch_bounds">, Declspec<"__launch_bounds__">];
- let Args = [ExprArgument<"MaxThreads">, ExprArgument<"MinBlocks", 1>];
+ let Args = [ExprArgument<"MaxThreads">, ExprArgument<"MinBlocks", 1>,
+ ExprArgument<"MaxBlocks", 1>];
let LangOpts = [CUDA];
let Subjects = SubjectList<[ObjCMethod, FunctionLike]>;
// An AST node is created for this attribute, but is not used by other parts
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 0ac4df8edb242f6..088e3a45c7babba 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -11836,6 +11836,10 @@ def err_sycl_special_type_num_init_method : Error<
"types with 'sycl_special_class' attribute must have one and only one '__init' "
"method defined">;
+def warn_cuda_maxclusterrank_sm_90 : Warning<
+ "maxclusterrank requires sm_90 or higher, CUDA arch provided: %0, ignoring "
+ "%1 attribute">, InGroup<IgnoredAttributes>;
+
def err_bit_int_bad_size : Error<"%select{signed|unsigned}0 _BitInt must "
"have a bit size of at least %select{2|1}0">;
def err_bit_int_max_size : Error<"%select{signed|unsigned}0 _BitInt of bit "
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 47379e00a7445e3..dca7b66da3796d9 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -11051,12 +11051,13 @@ class Sema final {
/// Create an CUDALaunchBoundsAttr attribute.
CUDALaunchBoundsAttr *CreateLaunchBoundsAttr(const AttributeCommonInfo &CI,
Expr *MaxThreads,
- Expr *MinBlocks);
+ Expr *MinBlocks,
+ Expr *MaxBlocks);
/// AddLaunchBoundsAttr - Adds a launch_bounds attribute to a particular
/// declaration.
void AddLaunchBoundsAttr(Decl *D, const AttributeCommonInfo &CI,
- Expr *MaxThreads, Expr *MinBlocks);
+ Expr *MaxThreads, Expr *MinBlocks, Expr *MaxBlocks);
/// AddModeAttr - Adds a mode attribute to a particular declaration.
void AddModeAttr(Decl *D, const AttributeCommonInfo &CI, IdentifierInfo *Name,
diff --git a/clang/lib/CodeGen/Targets/NVPTX.cpp b/clang/lib/CodeGen/Targets/NVPTX.cpp
index 0d4bbd795648008..64d019a10514d60 100644
--- a/clang/lib/CodeGen/Targets/NVPTX.cpp
+++ b/clang/lib/CodeGen/Targets/NVPTX.cpp
@@ -296,8 +296,8 @@ void CodeGenModule::handleCUDALaunchBoundsAttr(
NVPTXTargetCodeGenInfo::addNVVMMetadata(F, "maxntidx",
MaxThreads.getExtValue());
- // min blocks is an optional argument for CUDALaunchBoundsAttr. If it was
- // not specified in __launch_bounds__ or if the user specified a 0 value,
+ // min and max blocks is an optional argument for CUDALaunchBoundsAttr. If it
+ // was not specified in __launch_bounds__ or if the user specified a 0 value,
// we don't have to add a PTX directive.
if (Attr->getMinBlocks()) {
llvm::APSInt MinBlocks(32);
@@ -307,6 +307,14 @@ void CodeGenModule::handleCUDALaunchBoundsAttr(
NVPTXTargetCodeGenInfo::addNVVMMetadata(F, "minctasm",
MinBlocks.getExtValue());
}
+ if (Attr->getMaxBlocks()) {
+ llvm::APSInt MaxBlocks(32);
+ MaxBlocks = Attr->getMaxBlocks()->EvaluateKnownConstInt(getContext());
+ if (MaxBlocks > 0)
+ // Create !{<func-ref>, metadata !"maxclusterrank", i32 <val>} node
+ NVPTXTargetCodeGenInfo::addNVVMMetadata(F, "maxclusterrank",
+ MaxBlocks.getExtValue());
+ }
}
std::unique_ptr<TargetCodeGenInfo>
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 605b97617432ed3..8a8a126bf7244d4 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -3739,7 +3739,8 @@ OMPClause *Parser::ParseOpenMPOMPXAttributesClause(bool ParseOnly) {
continue;
if (auto *A = Actions.CreateLaunchBoundsAttr(
PA, PA.getArgAsExpr(0),
- PA.getNumArgs() > 1 ? PA.getArgAsExpr(1) : nullptr))
+ PA.getNumArgs() > 1 ? PA.getArgAsExpr(1) : nullptr,
+ PA.getNumArgs() > 2 ? PA.getArgAsExpr(2) : nullptr))
Attrs.push_back(A);
continue;
default:
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index cc98713241395ec..e62a0d4fc29f9cd 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -5607,6 +5607,21 @@ bool Sema::CheckRegparmAttr(const ParsedAttr &AL, unsigned &numParams) {
return false;
}
+// Helper to get CudaArch.
+static CudaArch getCudaArch(const TargetInfo &TI) {
+ if (!TI.hasFeature("ptx")) {
+ return CudaArch::UNKNOWN;
+ }
+ for (const auto &Feature : TI.getTargetOpts().FeatureMap) {
+ if (Feature.getValue()) {
+ CudaArch Arch = StringToCudaArch(Feature.getKey());
+ if (Arch != CudaArch::UNKNOWN)
+ return Arch;
+ }
+ }
+ return CudaArch::UNKNOWN;
+}
+
// Checks whether an argument of launch_bounds attribute is
// acceptable, performs implicit conversion to Rvalue, and returns
// non-nullptr Expr result on success. Otherwise, it returns nullptr
@@ -5650,8 +5665,8 @@ static Expr *makeLaunchBoundsArgExpr(Sema &S, Expr *E,
CUDALaunchBoundsAttr *
Sema::CreateLaunchBoundsAttr(const AttributeCommonInfo &CI, Expr *MaxThreads,
- Expr *MinBlocks) {
- CUDALaunchBoundsAttr TmpAttr(Context, CI, MaxThreads, MinBlocks);
+ Expr *MinBlocks, Expr *MaxBlocks) {
+ CUDALaunchBoundsAttr TmpAttr(Context, CI, MaxThreads, MinBlocks, MaxBlocks);
MaxThreads = makeLaunchBoundsArgExpr(*this, MaxThreads, TmpAttr, 0);
if (MaxThreads == nullptr)
return nullptr;
@@ -5662,22 +5677,39 @@ Sema::CreateLaunchBoundsAttr(const AttributeCommonInfo &CI, Expr *MaxThreads,
return nullptr;
}
+ if (MaxBlocks) {
+ // Feature '.maxclusterrank' requires .target sm_90 or higher.
+ auto SM = getCudaArch(Context.getTargetInfo());
+ if (SM == CudaArch::UNKNOWN || SM < CudaArch::SM_90) {
+ Diag(MaxBlocks->getBeginLoc(), diag::warn_cuda_maxclusterrank_sm_90)
+ << CudaArchToString(SM) << CI << MaxBlocks->getSourceRange();
+ // Ignore it by setting MaxBlocks to null;
+ MaxBlocks = nullptr;
+ } else {
+ MaxBlocks = makeLaunchBoundsArgExpr(*this, MaxBlocks, TmpAttr, 2);
+ if (MaxBlocks == nullptr)
+ return nullptr;
+ }
+ }
+
return ::new (Context)
- CUDALaunchBoundsAttr(Context, CI, MaxThreads, MinBlocks);
+ CUDALaunchBoundsAttr(Context, CI, MaxThreads, MinBlocks, MaxBlocks);
}
void Sema::AddLaunchBoundsAttr(Decl *D, const AttributeCommonInfo &CI,
- Expr *MaxThreads, Expr *MinBlocks) {
- if (auto *Attr = CreateLaunchBoundsAttr(CI, MaxThreads, MinBlocks))
+ Expr *MaxThreads, Expr *MinBlocks,
+ Expr *MaxBlocks) {
+ if (auto *Attr = CreateLaunchBoundsAttr(CI, MaxThreads, MinBlocks, MaxBlocks))
D->addAttr(Attr);
}
static void handleLaunchBoundsAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
- if (!AL.checkAtLeastNumArgs(S, 1) || !AL.checkAtMostNumArgs(S, 2))
+ if (!AL.checkAtLeastNumArgs(S, 1) || !AL.checkAtMostNumArgs(S, 3))
return;
S.AddLaunchBoundsAttr(D, AL, AL.getArgAsExpr(0),
- AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr);
+ AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr,
+ AL.getNumArgs() > 2 ? AL.getArgAsExpr(2) : nullptr);
}
static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 37a7d6204413a38..3f7268f5450a6fa 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -302,7 +302,15 @@ static void instantiateDependentCUDALaunchBoundsAttr(
MinBlocks = Result.getAs<Expr>();
}
- S.AddLaunchBoundsAttr(New, Attr, MaxThreads, MinBlocks);
+ Expr *MaxBlocks = nullptr;
+ if (Attr.getMaxBlocks()) {
+ Result = S.SubstExpr(Attr.getMaxBlocks(), TemplateArgs);
+ if (Result.isInvalid())
+ return;
+ MaxBlocks = Result.getAs<Expr>();
+ }
+
+ S.AddLaunchBoundsAttr(New, Attr, MaxThreads, MinBlocks, MaxBlocks);
}
static void
diff --git a/clang/test/CodeGenCUDA/launch-bounds.cu b/clang/test/CodeGenCUDA/launch-bounds.cu
index 58bcc410201f35f..31ca9216b413e92 100644
--- a/clang/test/CodeGenCUDA/launch-bounds.cu
+++ b/clang/test/CodeGenCUDA/launch-bounds.cu
@@ -1,9 +1,13 @@
// RUN: %clang_cc1 %s -triple nvptx-unknown-unknown -fcuda-is-device -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple nvptx-unknown-unknown -target-cpu sm_90 -DUSE_MAX_BLOCKS -fcuda-is-device -emit-llvm -o - | FileCheck -check-prefix=CHECK_MAX_BLOCKS %s
#include "Inputs/cuda.h"
#define MAX_THREADS_PER_BLOCK 256
#define MIN_BLOCKS_PER_MP 2
+#ifdef USE_MAX_BLOCKS
+#define MAX_BLOCKS_PER_MP 4
+#endif
// Test both max threads per block and Min cta per sm.
extern "C" {
@@ -17,6 +21,21 @@ Kernel1()
// CHECK: !{{[0-9]+}} = !{ptr @Kernel1, !"maxntidx", i32 256}
// CHECK: !{{[0-9]+}} = !{ptr @Kernel1, !"minctasm", i32 2}
+#ifdef USE_MAX_BLOCKS
+// Test max threads per block and min/max cta per sm.
+extern "C" {
+__global__ void
+__launch_bounds__( MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP, MAX_BLOCKS_PER_MP )
+Kernel1_sm_90()
+{
+}
+}
+
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @Kernel1_sm_90, !"maxntidx", i32 256}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @Kernel1_sm_90, !"minctasm", i32 2}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @Kernel1_sm_90, !"maxclusterrank", i32 4}
+#endif // USE_MAX_BLOCKS
+
// Test only max threads per block. Min cta per sm defaults to 0, and
// CodeGen doesn't output a zero value for minctasm.
extern "C" {
@@ -50,6 +69,20 @@ template __global__ void Kernel4<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP>();
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4{{.*}}, !"maxntidx", i32 256}
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4{{.*}}, !"minctasm", i32 2}
+#ifdef USE_MAX_BLOCKS
+template <int max_threads_per_block, int min_blocks_per_mp, int max_blocks_per_mp>
+__global__ void
+__launch_bounds__(max_threads_per_block, min_blocks_per_mp, max_blocks_per_mp)
+Kernel4_sm_90()
+{
+}
+template __global__ void Kernel4_sm_90<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP, MAX_BLOCKS_PER_MP>();
+
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4_sm_90{{.*}}, !"maxntidx", i32 256}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4_sm_90{{.*}}, !"minctasm", i32 2}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel4_sm_90{{.*}}, !"maxclusterrank", i32 4}
+#endif //USE_MAX_BLOCKS
+
const int constint = 100;
template <int max_threads_per_block, int min_blocks_per_mp>
__global__ void
@@ -63,6 +96,23 @@ template __global__ void Kernel5<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP>();
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5{{.*}}, !"maxntidx", i32 356}
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5{{.*}}, !"minctasm", i32 258}
+#ifdef USE_MAX_BLOCKS
+
+template <int max_threads_per_block, int min_blocks_per_mp, int max_blocks_per_mp>
+__global__ void
+__launch_bounds__(max_threads_per_block + constint,
+ min_blocks_per_mp + max_threads_per_block,
+ max_blocks_per_mp + max_threads_per_block)
+Kernel5_sm_90()
+{
+}
+template __global__ void Kernel5_sm_90<MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP, MAX_BLOCKS_PER_MP>();
+
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5_sm_90{{.*}}, !"maxntidx", i32 356}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5_sm_90{{.*}}, !"minctasm", i32 258}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel5_sm_90{{.*}}, !"maxclusterrank", i32 260}
+#endif //USE_MAX_BLOCKS
+
// Make sure we don't emit negative launch bounds values.
__global__ void
__launch_bounds__( -MAX_THREADS_PER_BLOCK, MIN_BLOCKS_PER_MP )
@@ -80,7 +130,26 @@ Kernel7()
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7{{.*}}, !"maxntidx",
// CHECK-NOT: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7{{.*}}, !"minctasm",
+#ifdef USE_MAX_BLOCKS
+__global__ void
+__launch_bounds__( MAX_THREADS_PER_BLOCK, -MIN_BLOCKS_PER_MP, -MAX_BLOCKS_PER_MP )
+Kernel7_sm_90()
+{
+}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7_sm_90{{.*}}, !"maxntidx",
+// CHECK_MAX_BLOCKS-NOT: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7_sm_90{{.*}}, !"minctasm",
+// CHECK_MAX_BLOCKS-NOT: !{{[0-9]+}} = !{ptr @{{.*}}Kernel7_sm_90{{.*}}, !"maxclusterrank",
+#endif // USE_MAX_BLOCKS
+
const char constchar = 12;
__global__ void __launch_bounds__(constint, constchar) Kernel8() {}
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel8{{.*}}, !"maxntidx", i32 100
// CHECK: !{{[0-9]+}} = !{ptr @{{.*}}Kernel8{{.*}}, !"minctasm", i32 12
+
+#ifdef USE_MAX_BLOCKS
+const char constchar_2 = 14;
+__global__ void __launch_bounds__(constint, constchar, constchar_2) Kernel8_sm_90() {}
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel8_sm_90{{.*}}, !"maxntidx", i32 100
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel8_sm_90{{.*}}, !"minctasm", i32 12
+// CHECK_MAX_BLOCKS: !{{[0-9]+}} = !{ptr @{{.*}}Kernel8_sm_90{{.*}}, !"maxclusterrank", i32 14
+#endif // USE_MAX_BLOCKS
diff --git a/clang/test/SemaCUDA/launch_bounds.cu b/clang/test/SemaCUDA/launch_bounds.cu
index 0ca0c0145d8bbb6..b1f29480da30c65 100644
--- a/clang/test/SemaCUDA/launch_bounds.cu
+++ b/clang/test/SemaCUDA/launch_bounds.cu
@@ -12,7 +12,7 @@ __launch_bounds__(0x10000000000000000) void TestWayTooBigArg(void); // expected-
__launch_bounds__(-128, 7) void TestNegArg1(void); // expected-warning {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
__launch_bounds__(128, -7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
-__launch_bounds__(1, 2, 3) void Test3Args(void); // expected-error {{'launch_bounds' attribute takes no more than 2 arguments}}
+__launch_bounds__(1, 2, 3, 4) void Test4Args(void); // expected-error {{'launch_bounds' attribute takes no more than 3 arguments}}
__launch_bounds__() void TestNoArgs(void); // expected-error {{'launch_bounds' attribute takes at least 1 argument}}
int TestNoFunction __launch_bounds__(128, 7); // expected-warning {{'launch_bounds' attribute only applies to Objective-C methods, functions, and function pointers}}
@@ -47,3 +47,5 @@ __launch_bounds__(Args) void TestTemplateVariadicArgs(void) {} // expected-error
template <int... Args>
__launch_bounds__(1, Args) void TestTemplateVariadicArgs2(void) {} // expected-error {{expression contains unexpanded parameter pack 'Args'}}
+
+__launch_bounds__(1, 2, 3) void Test3Args(void); // expected-warning {{maxclusterrank requires sm_90 or higher, CUDA arch provided: unknown, ignoring 'launch_bounds' attribute}}
diff --git a/clang/test/SemaCUDA/launch_bounds_sm_90.cu b/clang/test/SemaCUDA/launch_bounds_sm_90.cu
new file mode 100644
index 000000000000000..6b2369983b74fbb
--- /dev/null
+++ b/clang/test/SemaCUDA/launch_bounds_sm_90.cu
@@ -0,0 +1,45 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -triple nvptx-unknown-unknown -target-cpu sm_90 -verify %s
+
+#include "Inputs/cuda.h"
+
+__launch_bounds__(128, 7) void Test2Args(void);
+__launch_bounds__(128) void Test1Arg(void);
+
+__launch_bounds__(0xffffffff) void TestMaxArg(void);
+__launch_bounds__(0x100000000) void TestTooBigArg(void); // expected-error {{integer constant expression evaluates to value 4294967296 that cannot be represented in a 32-bit unsigned integer type}}
+__launch_bounds__(0x10000000000000000) void TestWayTooBigArg(void); // expected-error {{integer literal is too large to be represented in any integer type}}
+__launch_bounds__(1, 1, 0x10000000000000000) void TestWayTooBigArg(void); // expected-error {{integer literal is too large to be represented in any integer type}}
+
+__launch_bounds__(-128, 7) void TestNegArg1(void); // expected-warning {{'launch_bounds' attribute parameter 0 is negative and will be ignored}}
+__launch_bounds__(128, -7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 1 is negative and will be ignored}}
+__launch_bounds__(128, 1, -7) void TestNegArg2(void); // expected-warning {{'launch_bounds' attribute parameter 2 is negative and will be ignored}}
+
+
+__launch_bounds__(1, 2, 3, 4) void Test4Args(void); // expected-error {{'launch_bounds' attribute takes no more than 3 arguments}}
+__launch_bounds__() void TestNoArgs(void); // expected-error {{'launch_bounds' attribute takes at least 1 argument}}
+
+int TestNoFunction __launch_bounds__(128, 7, 13); // expected-warning {{'launch_bounds' attribute only applies to Objective-C methods, functions, and function pointers}}
+
+__launch_bounds__(true) void TestBool(void);
+__launch_bounds__(128, 1, 128.0) void TestFP(void); // expected-error {{'launch_bounds' attribute requires parameter 2 to be an integer constant}}
+__launch_bounds__(128, 1, (void*)0) void TestNullptr(void); // expected-error {{'launch_bounds' ...
<truncated>
</pre>
</details>
https://github.com/llvm/llvm-project/pull/66496
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