[polly] r244720 - Add another test case with trival PHI in entry BB

[Michael Kruse via llvm-commits]

Author: meinersbur
Date: Wed Aug 12 02:34:55 2015
New Revision: 244720

URL: http://llvm.org/viewvc/llvm-project?rev=244720&view=rev
Log:
Add another test case with trival PHI in entry BB

This one was extracted from the test-suite's pifft and caused a
miscompilation because a scalar was not written to its alloca address.


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

Added: polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll?rev=244720&view=auto
==============================================================================
--- polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll (added)
+++ polly/trunk/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll Wed Aug 12 02:34:55 2015
@@ -0,0 +1,38 @@
+; RUN: opt %loadPolly -polly-detect-unprofitable -polly-no-early-exit -polly-codegen -S < %s | FileCheck %s
+;
+; The entry of this scop's simple region (entry.split => for.end) has an trivial
+; PHI node that is used in a different of the scop region. LCSSA may create such
+; PHI nodes. This is a breakdown of this case in the function 'mp_unexp_sub' of
+; pifft from LLVM's test-suite.
+;
+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
+
+; CHECK-LABEL: polly.start:
+; CHECK:         store float %a, float* %b.phiops
+
+entry.split:
+  %b = phi float [ %a, %entry ]
+  %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 %b, 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
+}