[PATCH] D69391: Add #pragma clang loop ivdep

2019-11-23 Thread Yashas Andaluri via Phabricator via cfe-commits 
YashasAndaluri updated this revision to Diff 230767.
YashasAndaluri edited the summary of this revision.
YashasAndaluri added a comment.

Added IvdepEnable loop attribute and `llvm.loop.vectorize.ivdep.enable` 
metadata.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69391/new/

https://reviews.llvm.org/D69391

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/lib/CodeGen/CGLoopInfo.cpp
  clang/lib/CodeGen/CGLoopInfo.h
  clang/lib/Parse/ParsePragma.cpp
  clang/lib/Sema/SemaStmtAttr.cpp
  clang/test/AST/ast-print-pragmas.cpp
  clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
  clang/test/Parser/pragma-loop.cpp
  clang/test/Parser/pragma-unroll-and-jam.cpp

Index: clang/test/Parser/pragma-unroll-and-jam.cpp
===
--- clang/test/Parser/pragma-unroll-and-jam.cpp
+++ clang/test/Parser/pragma-unroll-and-jam.cpp
@@ -67,7 +67,7 @@
   }
 
 // 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, pipeline, pipeline_initiation_interval, vectorize_predicate, 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, vectorize_predicate, ivdep, 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;
Index: clang/test/Parser/pragma-loop.cpp
===
--- clang/test/Parser/pragma-loop.cpp
+++ clang/test/Parser/pragma-loop.cpp
@@ -82,6 +82,7 @@
 #pragma clang loop vectorize(enable)
 #pragma clang loop interleave(enable)
 #pragma clang loop vectorize_predicate(enable)
+#pragma clang loop ivdep(enable)
 #pragma clang loop unroll(full)
   while (i + 1 < Length) {
 List[i] = i;
@@ -135,12 +136,14 @@
 /* expected-error {{expected '('}} */ #pragma clang loop vectorize_predicate
 /* expected-error {{expected '('}} */ #pragma clang loop unroll
 /* expected-error {{expected '('}} */ #pragma clang loop distribute
+/* expected-error {{expected '('}} */ #pragma clang loop ivdep
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_predicate(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop unroll(full
 /* expected-error {{expected ')'}} */ #pragma clang loop distribute(enable
+/* expected-error {{expected ')'}} */ #pragma clang loop ivdep(enable
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_width(4
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave_count(4
@@ -151,7 +154,7 @@
 /* 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, pipeline, pipeline_initiation_interval, vectorize_predicate, or distribute}} */ #pragma clang loop
+/* expected-error {{missing option; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, pipeline, pipeline_initiation_interval, vectorize_predicate, ivdep, 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)
@@ -205,6 +208,7 @@
 /* expected-error {{invalid argument; expected 'enable', 'assume_safety' or 'disable'}} */ #pragma clang loop interleave(badidentifier)
 /* expected-error {{invalid argument; expected 'enable', 'full' or 'disable'}} */ #pragma clang loop unroll(badidentifier)
 /* expected-error {{invalid argument; expected 'enable' or 'disable'}} */ #pragma clang loop distribute(badidentifier)
+/* expected-error {{invalid argument; expected 'enable'}} */ #pragma clang loop ivdep(badidentifier)
   while (i-7 < Length) {
 List[i] = i;
   }
Index: clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
===
--- /dev/null
+++ clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
@@ -0,0 +1,34 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++11 -emit-llvm -o - %s | FileCheck %s
+
+void test0(int *a, int *b, int LEN_1D) {
+  // CHECK-LABEL: @{{.*}}test0{{.*}}(
+

[PATCH] D69391: Add #pragma clang loop ivdep

2019-10-28 Thread Yashas Andaluri via Phabricator via cfe-commits 
YashasAndaluri updated this revision to Diff 226644.
YashasAndaluri edited the summary of this revision.
YashasAndaluri changed the edit policy from "Administrators" to "All Users".
YashasAndaluri added a comment.

Removed disable argument for ivdep


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69391/new/

https://reviews.llvm.org/D69391

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/lib/CodeGen/CGLoopInfo.cpp
  clang/lib/Parse/ParsePragma.cpp
  clang/lib/Sema/SemaStmtAttr.cpp
  clang/test/AST/ast-print-pragmas.cpp
  clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
  clang/test/Parser/pragma-loop.cpp
  clang/test/Parser/pragma-unroll-and-jam.cpp

Index: clang/test/Parser/pragma-unroll-and-jam.cpp
===
--- clang/test/Parser/pragma-unroll-and-jam.cpp
+++ clang/test/Parser/pragma-unroll-and-jam.cpp
@@ -67,7 +67,7 @@
   }
 
 // 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, pipeline, pipeline_initiation_interval, vectorize_predicate, 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, vectorize_predicate, ivdep, 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;
Index: clang/test/Parser/pragma-loop.cpp
===
--- clang/test/Parser/pragma-loop.cpp
+++ clang/test/Parser/pragma-loop.cpp
@@ -82,6 +82,7 @@
 #pragma clang loop vectorize(enable)
 #pragma clang loop interleave(enable)
 #pragma clang loop vectorize_predicate(enable)
+#pragma clang loop ivdep(enable)
 #pragma clang loop unroll(full)
   while (i + 1 < Length) {
 List[i] = i;
@@ -135,12 +136,14 @@
 /* expected-error {{expected '('}} */ #pragma clang loop vectorize_predicate
 /* expected-error {{expected '('}} */ #pragma clang loop unroll
 /* expected-error {{expected '('}} */ #pragma clang loop distribute
+/* expected-error {{expected '('}} */ #pragma clang loop ivdep
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_predicate(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop unroll(full
 /* expected-error {{expected ')'}} */ #pragma clang loop distribute(enable
+/* expected-error {{expected ')'}} */ #pragma clang loop ivdep(enable
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_width(4
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave_count(4
@@ -151,7 +154,7 @@
 /* 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, pipeline, pipeline_initiation_interval, vectorize_predicate, or distribute}} */ #pragma clang loop
+/* expected-error {{missing option; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, pipeline, pipeline_initiation_interval, vectorize_predicate, ivdep, 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)
@@ -205,6 +208,7 @@
 /* expected-error {{invalid argument; expected 'enable', 'assume_safety' or 'disable'}} */ #pragma clang loop interleave(badidentifier)
 /* expected-error {{invalid argument; expected 'enable', 'full' or 'disable'}} */ #pragma clang loop unroll(badidentifier)
 /* expected-error {{invalid argument; expected 'enable' or 'disable'}} */ #pragma clang loop distribute(badidentifier)
+/* expected-error {{invalid argument; expected 'enable'}} */ #pragma clang loop ivdep(badidentifier)
   while (i-7 < Length) {
 List[i] = i;
   }
Index: clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
===
--- /dev/null
+++ clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
@@ -0,0 +1,41 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++11 -emit-llvm -o - %s | FileCheck %s
+
+void test0(int *a, int *b, int LEN_1D) {
+  //

Re: [PATCH] D69391: Add #pragma clang loop ivdep

2019-10-25 Thread Michael Kruse via cfe-commits 
What's the motivation of even allowing `#pragma clang loop
ivdep(disable)`? It either has no effect or conflicts with other loop
hints.



Sorry, for not using Phabricator. When I try to submit a comment, I
get the following error:

You Shall Not Pass: D69391

You do not have permission to edit this object.
Users with the "Can Edit" capability:

Administrators can take this action.
The owner of a revision can always view and edit it.



Michael


Am Fr., 25. Okt. 2019 um 12:43 Uhr schrieb Hal Finkel via Phabricator
:
>
> hfinkel added a comment.
>
> This is the same as #pragma clang loop vectorize(assume_safety)?
>
> In D69391#1720845 , @xbolva00 wrote:
>
> > "#pragma ivdep" should work too (compatibiluty mode with intel, gcc).
>
>
> The semantics are not the same, unfortunately.
>
>
> Repository:
>   rG LLVM Github Monorepo
>
> CHANGES SINCE LAST ACTION
>   https://reviews.llvm.org/D69391/new/
>
> https://reviews.llvm.org/D69391
>
>
>
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[PATCH] D69391: Add #pragma clang loop ivdep

2019-10-25 Thread Hal Finkel via Phabricator via cfe-commits 
hfinkel added a comment.

This is the same as #pragma clang loop vectorize(assume_safety)?

In D69391#1720845 , @xbolva00 wrote:

> "#pragma ivdep" should work too (compatibiluty mode with intel, gcc).


The semantics are not the same, unfortunately.


Repository:
  rG LLVM Github Monorepo

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[PATCH] D69391: Add #pragma clang loop ivdep

2019-10-24 Thread Dávid Bolvanský via Phabricator via cfe-commits 
xbolva00 added a comment.

"#pragma ivdep" should work too (compatibiluty mode with intel, gcc).


Repository:
  rG LLVM Github Monorepo

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[PATCH] D69391: Add #pragma clang loop ivdep

2019-10-24 Thread Yashas Andaluri via Phabricator via cfe-commits 
YashasAndaluri updated this revision to Diff 226375.
YashasAndaluri added a comment.

Updated the diff to show context


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69391/new/

https://reviews.llvm.org/D69391

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/lib/CodeGen/CGLoopInfo.cpp
  clang/lib/Parse/ParsePragma.cpp
  clang/lib/Sema/SemaStmtAttr.cpp
  clang/test/AST/ast-print-pragmas.cpp
  clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
  clang/test/Parser/pragma-loop.cpp
  clang/test/Parser/pragma-unroll-and-jam.cpp

Index: clang/test/Parser/pragma-unroll-and-jam.cpp
===
--- clang/test/Parser/pragma-unroll-and-jam.cpp
+++ clang/test/Parser/pragma-unroll-and-jam.cpp
@@ -67,7 +67,7 @@
   }
 
 // 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, pipeline, pipeline_initiation_interval, vectorize_predicate, 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, vectorize_predicate, ivdep, 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;
Index: clang/test/Parser/pragma-loop.cpp
===
--- clang/test/Parser/pragma-loop.cpp
+++ clang/test/Parser/pragma-loop.cpp
@@ -82,6 +82,7 @@
 #pragma clang loop vectorize(enable)
 #pragma clang loop interleave(enable)
 #pragma clang loop vectorize_predicate(enable)
+#pragma clang loop ivdep(enable)
 #pragma clang loop unroll(full)
   while (i + 1 < Length) {
 List[i] = i;
@@ -97,6 +98,7 @@
 #pragma clang loop vectorize(disable)
 #pragma clang loop interleave(disable)
 #pragma clang loop vectorize_predicate(disable)
+#pragma clang loop ivdep(disable)
 #pragma clang loop unroll(disable)
   while (i - 1 < Length) {
 List[i] = i;
@@ -113,7 +115,7 @@
   }
 
   int VList[Length];
-#pragma clang loop vectorize(disable) interleave(disable) unroll(disable) vectorize_predicate(disable)
+#pragma clang loop vectorize(disable) interleave(disable) unroll(disable) vectorize_predicate(disable) ivdep(disable)
   for (int j : VList) {
 VList[j] = List[j];
   }
@@ -135,12 +137,14 @@
 /* expected-error {{expected '('}} */ #pragma clang loop vectorize_predicate
 /* expected-error {{expected '('}} */ #pragma clang loop unroll
 /* expected-error {{expected '('}} */ #pragma clang loop distribute
+/* expected-error {{expected '('}} */ #pragma clang loop ivdep
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_predicate(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop unroll(full
 /* expected-error {{expected ')'}} */ #pragma clang loop distribute(enable
+/* expected-error {{expected ')'}} */ #pragma clang loop ivdep(enable
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_width(4
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave_count(4
@@ -151,7 +155,7 @@
 /* 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, pipeline, pipeline_initiation_interval, vectorize_predicate, or distribute}} */ #pragma clang loop
+/* expected-error {{missing option; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, pipeline, pipeline_initiation_interval, vectorize_predicate, ivdep, 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)
@@ -249,6 +253,8 @@
 /* expected-error {{duplicate directives 'vectorize(enable)' and 'vectorize(disable)'}} */ #pragma clang loop vectorize(disable)
 #pragma clang loop interleave(enable)
 /* expected-error {{duplicate directives 'interleave(enable)' and 'interleave(disable)'}} */ #pragma clang loop interleave(disable)
+#pragma clang loop ivdep(enable)
+/* expected-error {{duplicate directives 'ivdep(enable)' and 'ivdep(disable)'}} */

[PATCH] D69391: Add #pragma clang loop ivdep

2019-10-24 Thread Yashas Andaluri via Phabricator via cfe-commits 
YashasAndaluri created this revision.
YashasAndaluri added reviewers: hfinkel, Meinersbur, rscottmanley, DTharun.
YashasAndaluri created this object with edit policy "Administrators".
YashasAndaluri added a project: clang.
Herald added subscribers: cfe-commits, zzheng.
YashasAndaluri edited the summary of this revision.
YashasAndaluri edited the summary of this revision.
YashasAndaluri edited the summary of this revision.
YashasAndaluri edited the summary of this revision.
YashasAndaluri edited the summary of this revision.

This patch adds a `ivdep` pragma which uses the `IsParallel` loop hint 
attribute to indicate to the vectorizer that load and store instructions in the 
loop can be executed in parallel (belong to the same `llvm.access.group`) . 
This pragma will also imply `vectorize(enable)`.
Usage:

  #pragma clang loop ivdep(enable|disable)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D69391

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/lib/CodeGen/CGLoopInfo.cpp
  clang/lib/Parse/ParsePragma.cpp
  clang/lib/Sema/SemaStmtAttr.cpp
  clang/test/AST/ast-print-pragmas.cpp
  clang/test/CodeGenCXX/pragma-loop-ivdep.cpp
  clang/test/Parser/pragma-loop.cpp
  clang/test/Parser/pragma-unroll-and-jam.cpp

Index: clang/test/Parser/pragma-unroll-and-jam.cpp
===
--- clang/test/Parser/pragma-unroll-and-jam.cpp
+++ clang/test/Parser/pragma-unroll-and-jam.cpp
@@ -67,7 +67,7 @@
   }
 
 // 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, pipeline, pipeline_initiation_interval, vectorize_predicate, 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, vectorize_predicate, ivdep, 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;
Index: clang/test/Parser/pragma-loop.cpp
===
--- clang/test/Parser/pragma-loop.cpp
+++ clang/test/Parser/pragma-loop.cpp
@@ -82,6 +82,7 @@
 #pragma clang loop vectorize(enable)
 #pragma clang loop interleave(enable)
 #pragma clang loop vectorize_predicate(enable)
+#pragma clang loop ivdep(enable)
 #pragma clang loop unroll(full)
   while (i + 1 < Length) {
 List[i] = i;
@@ -97,6 +98,7 @@
 #pragma clang loop vectorize(disable)
 #pragma clang loop interleave(disable)
 #pragma clang loop vectorize_predicate(disable)
+#pragma clang loop ivdep(disable)
 #pragma clang loop unroll(disable)
   while (i - 1 < Length) {
 List[i] = i;
@@ -113,7 +115,7 @@
   }
 
   int VList[Length];
-#pragma clang loop vectorize(disable) interleave(disable) unroll(disable) vectorize_predicate(disable)
+#pragma clang loop vectorize(disable) interleave(disable) unroll(disable) vectorize_predicate(disable) ivdep(disable)
   for (int j : VList) {
 VList[j] = List[j];
   }
@@ -135,12 +137,14 @@
 /* expected-error {{expected '('}} */ #pragma clang loop vectorize_predicate
 /* expected-error {{expected '('}} */ #pragma clang loop unroll
 /* expected-error {{expected '('}} */ #pragma clang loop distribute
+/* expected-error {{expected '('}} */ #pragma clang loop ivdep
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_predicate(enable
 /* expected-error {{expected ')'}} */ #pragma clang loop unroll(full
 /* expected-error {{expected ')'}} */ #pragma clang loop distribute(enable
+/* expected-error {{expected ')'}} */ #pragma clang loop ivdep(enable
 
 /* expected-error {{expected ')'}} */ #pragma clang loop vectorize_width(4
 /* expected-error {{expected ')'}} */ #pragma clang loop interleave_count(4
@@ -151,7 +155,7 @@
 /* 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, pipeline, pipeline_initiation_interval, vectorize_predicate, or distribute}} */ #pragma clang loop
+/* expected-error {{missing option; expected vectorize, vectorize_width, interleave, interleave_count, unroll, unroll_count, pipeline, pipeline_initiation_interval, vectorize_predicate, ivdep, or distribute}} */ #pragma clang loop
 /* expected-error {{invalid option