[llvm] r347488 - [NFC] Add test that demonstrates buggy behavior on term folding of LoopSimplifyCFG

[Max Kazantsev via llvm-commits]

Author: mkazantsev
Date: Fri Nov 23 02:34:22 2018
New Revision: 347488

URL: http://llvm.org/viewvc/llvm-project?rev=347488&view=rev
Log:
[NFC] Add test that demonstrates buggy behavior on term folding of LoopSimplifyCFG

Added:
    llvm/trunk/test/Transforms/LoopSimplifyCFG/phi_with_duplicating_inputs.ll

Added: llvm/trunk/test/Transforms/LoopSimplifyCFG/phi_with_duplicating_inputs.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopSimplifyCFG/phi_with_duplicating_inputs.ll?rev=347488&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopSimplifyCFG/phi_with_duplicating_inputs.ll (added)
+++ llvm/trunk/test/Transforms/LoopSimplifyCFG/phi_with_duplicating_inputs.ll Fri Nov 23 02:34:22 2018
@@ -0,0 +1,29 @@
+; This is currently failing because of bug in LoopSimplifyCFG. It does not update
+; duplicating Phi inputs properly.
+; XFAIL: *
+; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -loop-simplifycfg -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
+; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes='require<domtree>,loop(simplify-cfg)' -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
+; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -loop-simplifycfg -enable-mssa-loop-dependency=true -verify-memoryssa -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
+
+target datalayout = "P40"
+
+ at a = external global i16, align 1
+
+; CHECK-LABEL: @f1(
+
+define void @f1(i1 %cond) {
+entry:
+  br label %for.cond
+
+for.cond:
+  br i1 %cond, label %if.then, label %for.inc
+
+if.then:
+  %0 = load i16, i16* @a, align 1
+  %tobool = icmp ne i16 %0, 0
+  br i1 %tobool, label %for.inc, label %for.inc
+
+for.inc:
+  %c.1 = phi i16 [ 2, %if.then ], [ 2, %if.then ], [ 1, %for.cond ]
+  br label %for.cond
+}