[PATCH] D118699: [flang] Lower PAUSE statement

[Valentin Clement via Phabricator via llvm-commits]

clementval created this revision.
clementval added reviewers: jeanPerier, kiranchandramohan, PeteSteinfeld, schweitz, svedanayagam.
Herald added a subscriber: mehdi_amini.
Herald added a project: Flang.
clementval requested review of this revision.
Herald added subscribers: llvm-commits, jdoerfert.
Herald added a project: LLVM.

Lower the PAUSE statement to a runtime call.

This patch is part of the upstreaming effort from fir-dev branch.

Co-authored-by: Eric Schweitz <eschweitz at nvidia.com>
Co-authored-by: Jean Perier <jperier at nvidia.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118699

Files:
  flang/lib/Lower/Bridge.cpp
  flang/lib/Lower/Runtime.cpp
  flang/test/Lower/pause-statement.f90


Index: flang/test/Lower/pause-statement.f90
===================================================================
--- /dev/null
+++ flang/test/Lower/pause-statement.f90
@@ -0,0 +1,8 @@
+! RUN: bbc %s -emit-fir --canonicalize -o - | FileCheck %s
+
+! CHECK-LABEL pause_test
+subroutine pause_test()
+  ! CHECK: fir.call @_Fortran{{.*}}PauseStatement()
+  ! CHECK-NEXT: return
+  pause
+end subroutine
Index: flang/lib/Lower/Runtime.cpp
===================================================================
--- flang/lib/Lower/Runtime.cpp
+++ flang/lib/Lower/Runtime.cpp
@@ -73,3 +73,13 @@
   builder.create<fir::CallOp>(loc, callee, operands);
   genUnreachable(builder, loc);
 }
+
+void Fortran::lower::genPauseStatement(
+    Fortran::lower::AbstractConverter &converter,
+    const Fortran::parser::PauseStmt &) {
+  fir::FirOpBuilder &builder = converter.getFirOpBuilder();
+  mlir::Location loc = converter.getCurrentLocation();
+  mlir::FuncOp callee =
+      fir::runtime::getRuntimeFunc<mkRTKey(PauseStatement)>(loc, builder);
+  builder.create<fir::CallOp>(loc, callee, llvm::None);
+}
Index: flang/lib/Lower/Bridge.cpp
===================================================================
--- flang/lib/Lower/Bridge.cpp
+++ flang/lib/Lower/Bridge.cpp
@@ -554,7 +554,7 @@
   }
 
   void genFIR(const Fortran::parser::PauseStmt &stmt) {
-    TODO(toLocation(), "PauseStmt lowering");
+    genPauseStatement(*this, stmt);
   }
 
   void genFIR(const Fortran::parser::FailImageStmt &stmt) {


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