[polly] r244692 - Add test case for entry node with trivial PHI

[Michael Kruse via llvm-commits]

Author: meinersbur
Date: Tue Aug 11 18:09:19 2015
New Revision: 244692

URL: http://llvm.org/viewvc/llvm-project?rev=244692&view=rev
Log:
Add test case for entry node with trivial PHI

This is a break-down from the test-suite's oggenc where Polly currently
crashes. 


Added:
    polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi.ll

Added: polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi.ll
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi.ll?rev=244692&view=auto
==============================================================================
--- polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi.ll (added)
+++ polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi.ll Tue Aug 11 18:09:19 2015
@@ -0,0 +1,37 @@
+; RUN: opt %loadPolly -polly-detect-unprofitable -polly-no-early-exit -polly-codegen -S < %s
+;
+; The entry of this scop's simple region (entry.split => for.end) has an trivial
+; PHI node. LCSSA may create such PHI nodes. This is a breakdown of this case in
+; the function 'Laguerre_With_Deflation' of oggenc from LLVM's test-suite.
+;
+; XFAIL: *
+;
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @test(i64 %n, float* noalias nonnull %A, float %a) {
+entry:
+  br label %entry.split
+
+entry.split:
+  %b = phi float [ %a, %entry ]
+  store float %b, float* %A, align 4
+  %cmp2 = icmp slt i64 %n, 5
+  br i1 %cmp2, label %for.cond, label %for.end
+
+for.cond:                                         ; preds = %for.inc, %entry
+  %i.0 = phi i64 [ 0, %entry.split ], [ %add, %for.inc ]
+  %cmp = icmp slt i64 %i.0, %n
+  br i1 %cmp, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  %arrayidx = getelementptr inbounds float, float* %A, i64 %i.0
+  store float %a, float* %arrayidx, align 4
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body
+  %add = add nuw nsw i64 %i.0, 1
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  ret void
+}