From cb1aef8de4abe60c75f154aa9d7100a36064e9c2 Mon Sep 17 00:00:00 2001
From: Tobias Grosser <tobias@grosser.es>
Date: Mon, 8 Aug 2016 17:35:55 +0000
Subject: [PATCH] [GPGPU] Create code to verify run-time conditions

llvm-svn: 278026
---
 polly/lib/CodeGen/PPCGCodeGeneration.cpp | 10 +++++-
 polly/test/GPGPU/run-time-check.ll       | 58 ++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 polly/test/GPGPU/run-time-check.ll

diff --git a/polly/lib/CodeGen/PPCGCodeGeneration.cpp b/polly/lib/CodeGen/PPCGCodeGeneration.cpp
index fa37f09..9d851d1 100644
--- a/polly/lib/CodeGen/PPCGCodeGeneration.cpp
+++ b/polly/lib/CodeGen/PPCGCodeGeneration.cpp
@@ -12,6 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "polly/CodeGen/IslAst.h"
 #include "polly/CodeGen/IslNodeBuilder.h"
 #include "polly/CodeGen/Utils.h"
 #include "polly/DependenceInfo.h"
@@ -2038,10 +2039,17 @@ public:
         executeScopConditionally(*S, this, Builder.getTrue());
 
     // TODO: Handle LICM
-    // TODO: Verify run-time checks
     auto SplitBlock = StartBlock->getSinglePredecessor();
     Builder.SetInsertPoint(SplitBlock->getTerminator());
     NodeBuilder.addParameters(S->getContext());
+
+    isl_ast_build *Build = isl_ast_build_alloc(S->getIslCtx());
+    isl_ast_expr *Condition = IslAst::buildRunCondition(S, Build);
+    isl_ast_build_free(Build);
+
+    Value *RTC = NodeBuilder.createRTC(Condition);
+    Builder.GetInsertBlock()->getTerminator()->setOperand(0, RTC);
+
     Builder.SetInsertPoint(&*StartBlock->begin());
 
     NodeBuilder.initializeAfterRTH();
diff --git a/polly/test/GPGPU/run-time-check.ll b/polly/test/GPGPU/run-time-check.ll
new file mode 100644
index 0000000..eb20867
--- /dev/null
+++ b/polly/test/GPGPU/run-time-check.ll
@@ -0,0 +1,58 @@
+; RUN: opt %loadPolly -polly-codegen-ppcg -S < %s | \
+; RUN: FileCheck %s -check-prefix=IR
+;
+; REQUIRES: pollyacc
+;
+;    void foo(long n, float A[][32]) {
+;      for (long i = 0; i < n; i++)
+;        for (long j = 0; j < n; j++)
+;          A[i][j] += A[i + 1][j + 1];
+;    }
+
+; IR:       %tmp = icmp slt i64 %i.0, %n
+; IR-NEXT:  br i1 %tmp, label %bb2, label %polly.merge_new_and_old
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @foo(i64 %n, [32 x float]* %A) {
+bb:
+  br label %bb1
+
+bb1:                                              ; preds = %bb15, %bb
+  %i.0 = phi i64 [ 0, %bb ], [ %tmp16, %bb15 ]
+  %tmp = icmp slt i64 %i.0, %n
+  br i1 %tmp, label %bb2, label %bb17
+
+bb2:                                              ; preds = %bb1
+  br label %bb3
+
+bb3:                                              ; preds = %bb12, %bb2
+  %j.0 = phi i64 [ 0, %bb2 ], [ %tmp13, %bb12 ]
+  %exitcond = icmp ne i64 %j.0, %n
+  br i1 %exitcond, label %bb4, label %bb14
+
+bb4:                                              ; preds = %bb3
+  %tmp5 = add nuw nsw i64 %j.0, 1
+  %tmp6 = add nuw nsw i64 %i.0, 1
+  %tmp7 = getelementptr inbounds [32 x float], [32 x float]* %A, i64 %tmp6, i64 %tmp5
+  %tmp8 = load float, float* %tmp7, align 4
+  %tmp9 = getelementptr inbounds [32 x float], [32 x float]* %A, i64 %i.0, i64 %j.0
+  %tmp10 = load float, float* %tmp9, align 4
+  %tmp11 = fadd float %tmp10, %tmp8
+  store float %tmp11, float* %tmp9, align 4
+  br label %bb12
+
+bb12:                                             ; preds = %bb4
+  %tmp13 = add nuw nsw i64 %j.0, 1
+  br label %bb3
+
+bb14:                                             ; preds = %bb3
+  br label %bb15
+
+bb15:                                             ; preds = %bb14
+  %tmp16 = add nuw nsw i64 %i.0, 1
+  br label %bb1
+
+bb17:                                             ; preds = %bb1
+  ret void
+}
-- 
2.7.4