This patch adds #pragma clang loop pipeline and #pragma clang loop pipeline_initiation_interval for debugging or reducing compile time purposes. It is possible to disable SWP for concrete loops to save compilation time or to find bugs by not doing SWP to certain loops. It is possible to set value of initiation interval to concrete number to save compilation time by not doing extra pipeliner passes or to check created schedule for specific initiation interval.
Patch by Alexey Lapshin.
llvm-svn: 350414
/// unroll_count: unrolls loop 'Value' times.
/// unroll_and_jam: attempt to unroll and jam loop if State == Enable.
/// unroll_and_jam_count: unroll and jams loop 'Value' times.
- /// distribute: attempt to distribute loop if State == Enable
+ /// distribute: attempt to distribute loop if State == Enable.
+ /// pipeline: disable pipelining loop if State == Disable.
+ /// pipeline_initiation_interval: create loop schedule with initiation interval equal to 'Value'.
/// #pragma unroll <argument> directive
/// <no arg>: fully unrolls loop.
let Args = [EnumArgument<"Option", "OptionType",
["vectorize", "vectorize_width", "interleave", "interleave_count",
"unroll", "unroll_count", "unroll_and_jam", "unroll_and_jam_count",
- "distribute"],
+ "pipeline", "pipeline_initiation_interval", "distribute"],
["Vectorize", "VectorizeWidth", "Interleave", "InterleaveCount",
"Unroll", "UnrollCount", "UnrollAndJam", "UnrollAndJamCount",
- "Distribute"]>,
+ "PipelineDisabled", "PipelineInitiationInterval", "Distribute"]>,
EnumArgument<"State", "LoopHintState",
["enable", "disable", "numeric", "assume_safety", "full"],
["Enable", "Disable", "Numeric", "AssumeSafety", "Full"]>,
case UnrollCount: return "unroll_count";
case UnrollAndJam: return "unroll_and_jam";
case UnrollAndJamCount: return "unroll_and_jam_count";
+ case PipelineDisabled: return "pipeline";
+ case PipelineInitiationInterval: return "pipeline_initiation_interval";
case Distribute: return "distribute";
}
llvm_unreachable("Unhandled LoopHint option.");
let Heading = "#pragma clang loop";
let Content = [{
The ``#pragma clang loop`` directive allows loop optimization hints to be
-specified for the subsequent loop. The directive allows vectorization,
-interleaving, and unrolling to be enabled or disabled. Vector width as well
-as interleave and unrolling count can be manually specified. See
-`language extensions
+specified for the subsequent loop. The directive allows pipelining to be
+disabled, or vectorization, interleaving, and unrolling to be enabled or disabled.
+Vector width, interleave count, unrolling count, and the initiation interval
+for pipelining can be explicitly specified. See `language extensions
<http://clang.llvm.org/docs/LanguageExtensions.html#extensions-for-loop-hint-optimizations>`_
for details.
}];
}];
}
+def PipelineHintDocs : Documentation {
+ let Category = DocCatStmt;
+ let Heading = "#pragma clang loop pipeline, #pragma clang loop pipeline_initiation_interval";
+ let Content = [{
+ Software Pipelining optimization is a technique used to optimize loops by
+ utilizing instruction-level parallelism. It reorders loop instructions to
+ overlap iterations. As a result, the next iteration starts before the previous
+ iteration has finished. The module scheduling technique creates a schedule for
+ one iteration such that when repeating at regular intervals, no inter-iteration
+ dependencies are violated. This constant interval(in cycles) between the start
+ of iterations is called the initiation interval. i.e. The initiation interval
+ is the number of cycles between two iterations of an unoptimized loop in the
+ newly created schedule. A new, optimized loop is created such that a single iteration
+ of the loop executes in the same number of cycles as the initiation interval.
+ For further details see <https://llvm.org/pubs/2005-06-17-LattnerMSThesis-book.pdf>.
+
+ ``#pragma clang loop pipeline and #pragma loop pipeline_initiation_interval``
+ could be used as hints for the software pipelining optimization. The pragma is
+ placed immediately before a for, while, do-while, or a C++11 range-based for
+ loop.
+
+ Using ``#pragma clang loop pipeline(disable)`` avoids the software pipelining
+ optimization. The disable state can only be specified:
+
+ .. code-block:: c++
+
+ #pragma clang loop pipeline(disable)
+ for (...) {
+ ...
+ }
+
+ Using ``#pragma loop pipeline_initiation_interval`` instructs
+ the software pipeliner to try the specified initiation interval.
+ If a schedule was found then the resulting loop iteration would have
+ the specified cycle count. If a schedule was not found then loop
+ remains unchanged. The initiation interval must be a positive number
+ greater than zero:
+
+ .. code-block:: c++
+
+ #pragma loop pipeline_initiation_interval(10)
+ for (...) {
+ ...
+ }
+
+ }];
+}
+
+
+
def OpenCLUnrollHintDocs : Documentation {
let Category = DocCatStmt;
let Content = [{
"'enable'%select{|, 'full'}1%select{|, 'assume_safety'}2 or 'disable'}0">;
def err_pragma_loop_invalid_option : Error<
"%select{invalid|missing}0 option%select{ %1|}0; expected vectorize, "
- "vectorize_width, interleave, interleave_count, unroll, unroll_count, or distribute">;
+ "vectorize_width, interleave, interleave_count, unroll, unroll_count, "
+ "pipeline, pipeline_initiation_interval, or distribute">;
def err_pragma_fp_invalid_option : Error<
"%select{invalid|missing}0 option%select{ %1|}0; expected contract">;
def err_pragma_invalid_keyword : Error<
"invalid argument; expected 'enable'%select{|, 'full'}0%select{|, 'assume_safety'}1 or 'disable'">;
+def err_pragma_pipeline_invalid_keyword : Error<
+ "invalid argument; expected 'disable'">;
// Pragma unroll support.
def warn_pragma_unroll_cuda_value_in_parens : Warning<
if (!Attrs.IsParallel && Attrs.VectorizeWidth == 0 &&
Attrs.InterleaveCount == 0 && Attrs.UnrollCount == 0 &&
- Attrs.UnrollAndJamCount == 0 &&
+ Attrs.UnrollAndJamCount == 0 && !Attrs.PipelineDisabled &&
+ Attrs.PipelineInitiationInterval == 0 &&
Attrs.VectorizeEnable == LoopAttributes::Unspecified &&
Attrs.UnrollEnable == LoopAttributes::Unspecified &&
Attrs.UnrollAndJamEnable == LoopAttributes::Unspecified &&
Ctx, {MDString::get(Ctx, "llvm.loop.parallel_accesses"), AccGroup}));
}
+ if (Attrs.PipelineDisabled) {
+ Metadata *Vals[] = {
+ MDString::get(Ctx, "llvm.loop.pipeline.disable"),
+ ConstantAsMetadata::get(ConstantInt::get(
+ Type::getInt1Ty(Ctx), (Attrs.PipelineDisabled == true)))};
+ Args.push_back(MDNode::get(Ctx, Vals));
+ }
+
+ if (Attrs.PipelineInitiationInterval > 0) {
+ Metadata *Vals[] = {
+ MDString::get(Ctx, "llvm.loop.pipeline.initiationinterval"),
+ ConstantAsMetadata::get(ConstantInt::get(
+ Type::getInt32Ty(Ctx), Attrs.PipelineInitiationInterval))};
+ Args.push_back(MDNode::get(Ctx, Vals));
+ }
+
// Set the first operand to itself.
MDNode *LoopID = MDNode::get(Ctx, Args);
LoopID->replaceOperandWith(0, LoopID);
UnrollEnable(LoopAttributes::Unspecified),
UnrollAndJamEnable(LoopAttributes::Unspecified), VectorizeWidth(0),
InterleaveCount(0), UnrollCount(0), UnrollAndJamCount(0),
- DistributeEnable(LoopAttributes::Unspecified) {}
+ DistributeEnable(LoopAttributes::Unspecified), PipelineDisabled(false),
+ PipelineInitiationInterval(0) {}
void LoopAttributes::clear() {
IsParallel = false;
UnrollEnable = LoopAttributes::Unspecified;
UnrollAndJamEnable = LoopAttributes::Unspecified;
DistributeEnable = LoopAttributes::Unspecified;
+ PipelineDisabled = false;
+ PipelineInitiationInterval = 0;
}
LoopInfo::LoopInfo(BasicBlock *Header, const LoopAttributes &Attrs,
case LoopHintAttr::Distribute:
setDistributeState(false);
break;
+ case LoopHintAttr::PipelineDisabled:
+ setPipelineDisabled(true);
+ break;
case LoopHintAttr::UnrollCount:
case LoopHintAttr::UnrollAndJamCount:
case LoopHintAttr::VectorizeWidth:
case LoopHintAttr::InterleaveCount:
+ case LoopHintAttr::PipelineInitiationInterval:
llvm_unreachable("Options cannot be disabled.");
break;
}
case LoopHintAttr::UnrollAndJamCount:
case LoopHintAttr::VectorizeWidth:
case LoopHintAttr::InterleaveCount:
+ case LoopHintAttr::PipelineDisabled:
+ case LoopHintAttr::PipelineInitiationInterval:
llvm_unreachable("Options cannot enabled.");
break;
}
case LoopHintAttr::VectorizeWidth:
case LoopHintAttr::InterleaveCount:
case LoopHintAttr::Distribute:
+ case LoopHintAttr::PipelineDisabled:
+ case LoopHintAttr::PipelineInitiationInterval:
llvm_unreachable("Options cannot be used to assume mem safety.");
break;
}
case LoopHintAttr::VectorizeWidth:
case LoopHintAttr::InterleaveCount:
case LoopHintAttr::Distribute:
+ case LoopHintAttr::PipelineDisabled:
+ case LoopHintAttr::PipelineInitiationInterval:
llvm_unreachable("Options cannot be used with 'full' hint.");
break;
}
case LoopHintAttr::UnrollAndJamCount:
setUnrollAndJamCount(ValueInt);
break;
+ case LoopHintAttr::PipelineInitiationInterval:
+ setPipelineInitiationInterval(ValueInt);
+ break;
case LoopHintAttr::Unroll:
case LoopHintAttr::UnrollAndJam:
case LoopHintAttr::Vectorize:
case LoopHintAttr::Interleave:
case LoopHintAttr::Distribute:
+ case LoopHintAttr::PipelineDisabled:
llvm_unreachable("Options cannot be assigned a value.");
break;
}
/// Value for llvm.loop.distribute.enable metadata.
LVEnableState DistributeEnable;
+
+ /// Value for llvm.loop.pipeline.disable metadata.
+ bool PipelineDisabled;
+
+ /// Value for llvm.loop.pipeline.iicount metadata.
+ unsigned PipelineInitiationInterval;
};
/// Information used when generating a structured loop.
/// \brief Set the unroll count for the next loop pushed.
void setUnrollAndJamCount(unsigned C) { StagedAttrs.UnrollAndJamCount = C; }
+ /// Set the pipeline disabled state.
+ void setPipelineDisabled(bool S) { StagedAttrs.PipelineDisabled = S; }
+
+ /// Set the pipeline initiation interval.
+ void setPipelineInitiationInterval(unsigned C) {
+ StagedAttrs.PipelineInitiationInterval = C;
+ }
+
private:
/// Returns true if there is LoopInfo on the stack.
bool hasInfo() const { return !Active.empty(); }
bool OptionUnroll = false;
bool OptionUnrollAndJam = false;
bool OptionDistribute = false;
+ bool OptionPipelineDisabled = false;
bool StateOption = false;
if (OptionInfo) { // Pragma Unroll does not specify an option.
OptionUnroll = OptionInfo->isStr("unroll");
OptionUnrollAndJam = OptionInfo->isStr("unroll_and_jam");
OptionDistribute = OptionInfo->isStr("distribute");
+ OptionPipelineDisabled = OptionInfo->isStr("pipeline");
StateOption = llvm::StringSwitch<bool>(OptionInfo->getName())
.Case("vectorize", true)
.Case("interleave", true)
.Default(false) ||
- OptionUnroll || OptionUnrollAndJam || OptionDistribute;
+ OptionUnroll || OptionUnrollAndJam || OptionDistribute ||
+ OptionPipelineDisabled;
}
- bool AssumeSafetyArg =
- !OptionUnroll && !OptionUnrollAndJam && !OptionDistribute;
+ bool AssumeSafetyArg = !OptionUnroll && !OptionUnrollAndJam &&
+ !OptionDistribute && !OptionPipelineDisabled;
// Verify loop hint has an argument.
if (Toks[0].is(tok::eof)) {
ConsumeAnnotationToken();
SourceLocation StateLoc = Toks[0].getLocation();
IdentifierInfo *StateInfo = Toks[0].getIdentifierInfo();
- bool Valid =
- StateInfo && llvm::StringSwitch<bool>(StateInfo->getName())
- .Cases("enable", "disable", true)
- .Case("full", OptionUnroll || OptionUnrollAndJam)
- .Case("assume_safety", AssumeSafetyArg)
- .Default(false);
+ bool Valid = StateInfo &&
+ llvm::StringSwitch<bool>(StateInfo->getName())
+ .Case("disable", true)
+ .Case("enable", !OptionPipelineDisabled)
+ .Case("full", OptionUnroll || OptionUnrollAndJam)
+ .Case("assume_safety", AssumeSafetyArg)
+ .Default(false);
if (!Valid) {
- Diag(Toks[0].getLocation(), diag::err_pragma_invalid_keyword)
- << /*FullKeyword=*/(OptionUnroll || OptionUnrollAndJam)
- << /*AssumeSafetyKeyword=*/AssumeSafetyArg;
+ if (OptionPipelineDisabled) {
+ Diag(Toks[0].getLocation(), diag::err_pragma_pipeline_invalid_keyword);
+ } else {
+ Diag(Toks[0].getLocation(), diag::err_pragma_invalid_keyword)
+ << /*FullKeyword=*/(OptionUnroll || OptionUnrollAndJam)
+ << /*AssumeSafetyKeyword=*/AssumeSafetyArg;
+ }
return false;
}
if (Toks.size() > 2)
/// 'vectorize_width' '(' loop-hint-value ')'
/// 'interleave_count' '(' loop-hint-value ')'
/// 'unroll_count' '(' loop-hint-value ')'
+/// 'pipeline' '(' disable ')'
+/// 'pipeline_initiation_interval' '(' loop-hint-value ')'
///
/// loop-hint-keyword:
/// 'enable'
.Case("vectorize_width", true)
.Case("interleave_count", true)
.Case("unroll_count", true)
+ .Case("pipeline", true)
+ .Case("pipeline_initiation_interval", true)
.Default(false);
if (!OptionValid) {
PP.Diag(Tok.getLocation(), diag::err_pragma_loop_invalid_option)
.Case("interleave_count", LoopHintAttr::InterleaveCount)
.Case("unroll", LoopHintAttr::Unroll)
.Case("unroll_count", LoopHintAttr::UnrollCount)
+ .Case("pipeline", LoopHintAttr::PipelineDisabled)
+ .Case("pipeline_initiation_interval",
+ LoopHintAttr::PipelineInitiationInterval)
.Case("distribute", LoopHintAttr::Distribute)
.Default(LoopHintAttr::Vectorize);
if (Option == LoopHintAttr::VectorizeWidth ||
Option == LoopHintAttr::InterleaveCount ||
- Option == LoopHintAttr::UnrollCount) {
+ Option == LoopHintAttr::UnrollCount ||
+ Option == LoopHintAttr::PipelineInitiationInterval) {
assert(ValueExpr && "Attribute must have a valid value expression.");
if (S.CheckLoopHintExpr(ValueExpr, St->getBeginLoc()))
return nullptr;
} else if (Option == LoopHintAttr::Vectorize ||
Option == LoopHintAttr::Interleave ||
Option == LoopHintAttr::Unroll ||
- Option == LoopHintAttr::Distribute) {
+ Option == LoopHintAttr::Distribute ||
+ Option == LoopHintAttr::PipelineDisabled) {
assert(StateLoc && StateLoc->Ident && "Loop hint must have an argument");
if (StateLoc->Ident->isStr("disable"))
State = LoopHintAttr::Disable;
static void
CheckForIncompatibleAttributes(Sema &S,
const SmallVectorImpl<const Attr *> &Attrs) {
- // There are 5 categories of loop hints attributes: vectorize, interleave,
- // unroll, unroll_and_jam and distribute. Except for distribute they come
- // in two variants: a state form and a numeric form. The state form
+ // There are 6 categories of loop hints attributes: vectorize, interleave,
+ // unroll, unroll_and_jam, pipeline and distribute. Except for distribute they
+ // come in two variants: a state form and a numeric form. The state form
// selectively defaults/enables/disables the transformation for the loop
// (for unroll, default indicates full unrolling rather than enabling the
// transformation). The numeric form form provides an integer hint (for
struct {
const LoopHintAttr *StateAttr;
const LoopHintAttr *NumericAttr;
- } HintAttrs[] = {{nullptr, nullptr},
- {nullptr, nullptr},
- {nullptr, nullptr},
- {nullptr, nullptr},
- {nullptr, nullptr}};
+ } HintAttrs[] = {{nullptr, nullptr}, {nullptr, nullptr}, {nullptr, nullptr},
+ {nullptr, nullptr}, {nullptr, nullptr}, {nullptr, nullptr}};
for (const auto *I : Attrs) {
const LoopHintAttr *LH = dyn_cast<LoopHintAttr>(I);
continue;
LoopHintAttr::OptionType Option = LH->getOption();
- enum { Vectorize, Interleave, Unroll, UnrollAndJam, Distribute } Category;
+ enum {
+ Vectorize,
+ Interleave,
+ Unroll,
+ UnrollAndJam,
+ Distribute,
+ Pipeline
+ } Category;
switch (Option) {
case LoopHintAttr::Vectorize:
case LoopHintAttr::VectorizeWidth:
// Perform the check for duplicated 'distribute' hints.
Category = Distribute;
break;
+ case LoopHintAttr::PipelineDisabled:
+ case LoopHintAttr::PipelineInitiationInterval:
+ Category = Pipeline;
+ break;
};
assert(Category < sizeof(HintAttrs) / sizeof(HintAttrs[0]));
if (Option == LoopHintAttr::Vectorize ||
Option == LoopHintAttr::Interleave || Option == LoopHintAttr::Unroll ||
Option == LoopHintAttr::UnrollAndJam ||
+ Option == LoopHintAttr::PipelineDisabled ||
Option == LoopHintAttr::Distribute) {
// Enable|Disable|AssumeSafety hint. For example, vectorize(enable).
PrevAttr = CategoryState.StateAttr;
--- /dev/null
+// RUN: %clang_cc1 -triple hexagon -std=c++11 -emit-llvm -o - %s | FileCheck %s
+
+void pipeline_disabled(int *List, int Length, int Value) {
+// CHECK-LABEL: define {{.*}} @_Z17pipeline_disabled
+#pragma clang loop pipeline(disable)
+ for (int i = 0; i < Length; i++) {
+ // CHECK: br label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
+ List[i] = Value;
+ }
+}
+
+void pipeline_not_disabled(int *List, int Length, int Value) {
+ // CHECK-LABEL: define {{.*}} @_Z21pipeline_not_disabled
+ for (int i = 0; i < Length; i++) {
+ List[i] = Value;
+ }
+}
+
+void pipeline_initiation_interval(int *List, int Length, int Value) {
+// CHECK-LABEL: define {{.*}} @_Z28pipeline_initiation_interval
+#pragma clang loop pipeline_initiation_interval(10)
+ for (int i = 0; i < Length; i++) {
+ // CHECK: br label {{.*}}, !llvm.loop ![[LOOP_3:.*]]
+ List[i] = Value;
+ }
+}
+
+void pipeline_disabled_on_nested_loop(int *List, int Length, int Value) {
+ // CHECK-LABEL: define {{.*}} @_Z32pipeline_disabled_on_nested_loop
+ for (int i = 0; i < Length; i++) {
+#pragma clang loop pipeline(disable)
+ for (int j = 0; j < Length; j++) {
+ // CHECK: br label {{.*}}, !llvm.loop ![[LOOP_4:.*]]
+ List[i * Length + j] = Value;
+ }
+ }
+}
+
+// CHECK: ![[LOOP_1]] = distinct !{![[LOOP_1]], ![[PIPELINE_DISABLE:.*]]}
+// CHECK: ![[PIPELINE_DISABLE]] = !{!"llvm.loop.pipeline.disable", i1 true}
+
+// CHECK-NOT:llvm.loop.pipeline
+
+// CHECK: ![[LOOP_3]] = distinct !{![[LOOP_3]], ![[PIPELINE_II_10:.*]]}
+// CHECK: ![[PIPELINE_II_10]] = !{!"llvm.loop.pipeline.initiationinterval", i32 10}
+
+// CHECK: ![[LOOP_4]] = distinct !{![[LOOP_4]], ![[PIPELINE_DISABLE]]}
/* expected-error {{missing argument; expected 'enable', 'full' or 'disable'}} */ #pragma clang loop unroll()
/* expected-error {{missing argument; expected 'enable' or 'disable'}} */ #pragma clang loop distribute()
-/* expected-error {{missing option; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, or distribute}} */ #pragma clang loop
+/* expected-error {{missing option; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, pipeline, pipeline_initiation_interval, or distribute}} */ #pragma clang loop
/* expected-error {{invalid option 'badkeyword'}} */ #pragma clang loop badkeyword
/* expected-error {{invalid option 'badkeyword'}} */ #pragma clang loop badkeyword(enable)
/* expected-error {{invalid option 'badkeyword'}} */ #pragma clang loop vectorize(enable) badkeyword(4)
--- /dev/null
+// RUN: %clang_cc1 -std=c++11 -verify %s
+
+// Note that this puts the expected lines before the directives to work around
+// limitations in the -verify mode.
+
+void test(int *List, int Length, int Value) {
+ int i = 0;
+
+#pragma clang loop pipeline(disable)
+ for (int i = 0; i < Length; i++) {
+ List[i] = Value;
+ }
+
+#pragma clang loop pipeline_initiation_interval(10)
+ for (int i = 0; i < Length; i++) {
+ List[i] = Value;
+ }
+
+/* expected-error {{expected ')'}} */ #pragma clang loop pipeline(disable
+/* expected-error {{invalid argument; expected 'disable'}} */ #pragma clang loop pipeline(enable)
+/* expected-error {{invalid argument; expected 'disable'}} */ #pragma clang loop pipeline(error)
+/* expected-error {{expected '('}} */ #pragma clang loop pipeline disable
+/* expected-error {{missing argument; expected an integer value}} */ #pragma clang loop pipeline_initiation_interval()
+/* expected-error {{use of undeclared identifier 'error'}} */ #pragma clang loop pipeline_initiation_interval(error)
+/* expected-error {{expected '('}} */ #pragma clang loop pipeline_initiation_interval 1 2
+/* expected-error {{expected ')'}} */ #pragma clang loop pipeline_initiation_interval(1
+ for (int i = 0; i < Length; i++) {
+ for (int j = 0; j < Length; j++) {
+ List[i * Length + j] = Value;
+ }
+ }
+
+}
}
// pragma clang unroll_and_jam is disabled for the moment
-/* expected-error {{invalid option 'unroll_and_jam'; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, or distribute}} */ #pragma clang loop unroll_and_jam(4)
+/* expected-error {{invalid option 'unroll_and_jam'; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, pipeline, pipeline_initiation_interval, or distribute}} */ #pragma clang loop unroll_and_jam(4)
for (int i = 0; i < Length; i++) {
for (int j = 0; j < Length; j++) {
List[i * Length + j] = Value;
--- /dev/null
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+
+#pragma clang loop pipeline(disable) /* expected-error {{expected unqualified-id}} */
+int main() {
+ for (int i = 0; i < 10; ++i)
+ ;
+}
+
+void test(int *List, int Length, int Value) {
+ int i = 0;
+
+/* expected-error {{invalid argument of type 'double'; expected an integer type}} */ #pragma clang loop pipeline_initiation_interval(1.0)
+/* expected-error {{invalid value '0'; must be positive}} */ #pragma clang loop pipeline_initiation_interval(0)
+/* expected-error {{invalid value '-1'; must be positive}} */ #pragma clang loop pipeline_initiation_interval(-1)
+ for (int i = 0; i < Length; i++) {
+ for (int j = 0; j < Length; j++) {
+ List[i * Length + j] = Value;
+ }
+ }
+
+#pragma clang loop pipeline(disable)
+/* expected-error {{expected a for, while, or do-while loop to follow '#pragma clang loop'}} */ int j = Length;
+#pragma clang loop pipeline_initiation_interval(4)
+/* expected-error {{expected a for, while, or do-while loop to follow '#pragma clang loop'}} */ int k = Length;
+
+#pragma clang loop pipeline(disable)
+#pragma clang loop pipeline_initiation_interval(4) /* expected-error {{incompatible directives 'pipeline(disable)' and 'pipeline_initiation_interval(4)'}} */
+ for (int i = 0; i < Length; i++) {
+ List[i] = Value;
+ }
+
+#pragma clang loop pipeline(disable)
+/* expected-error {{expected statement}} */ }
+
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