Vendor import of llvm trunk r161861:

http://llvm.org/svn/llvm-project/llvm/trunk@161861

1 files changed, 82 insertions, 0 deletions

diff --git a/test/CodeGen/X86/coalescer-identity.ll b/test/CodeGen/X86/coalescer-identity.ll
new file mode 100644
index 0000000..9c72ee6
--- /dev/null
+++ b/test/CodeGen/X86/coalescer-identity.ll
@@ -0,0 +1,82 @@
+; RUN: llc < %s -verify-coalescing
+; PR12927
+target triple = "x86_64-apple-macosx10.8.0"
+
+; This is a case where removeCopyByCommutingDef() creates an identity copy that
+; joinCopy must then deal with correctly.
+
+@s = common global i16 0, align 2
+@g1 = common global i32 0, align 4
+@g2 = common global i32 0, align 4
+@g0 = common global i32 0, align 4
+
+define void @func() nounwind uwtable ssp {
+for.body.lr.ph:
+  %0 = load i32* @g2, align 4, !tbaa !0
+  %tobool6 = icmp eq i32 %0, 0
+  %s.promoted = load i16* @s, align 2
+  %.pre = load i32* @g1, align 4, !tbaa !0
+  br i1 %tobool6, label %for.body.us, label %for.body
+
+for.body.us:                                      ; preds = %for.body.lr.ph, %for.inc.us
+  %1 = phi i32 [ %3, %for.inc.us ], [ %.pre, %for.body.lr.ph ]
+  %dec13.us = phi i16 [ %dec12.us, %for.inc.us ], [ %s.promoted, %for.body.lr.ph ]
+  %i.011.us = phi i32 [ %inc.us, %for.inc.us ], [ undef, %for.body.lr.ph ]
+  %v.010.us = phi i32 [ %phitmp.us, %for.inc.us ], [ 1, %for.body.lr.ph ]
+  %tobool1.us = icmp ne i32 %v.010.us, 0
+  %2 = zext i1 %tobool1.us to i16
+  %lnot.ext.us = xor i16 %2, 1
+  %add.us = add i16 %dec13.us, %lnot.ext.us
+  %conv3.us = zext i16 %add.us to i32
+  %add4.us = sub i32 0, %1
+  %tobool5.us = icmp eq i32 %conv3.us, %add4.us
+  br i1 %tobool5.us, label %for.inc.us, label %if.then7.us
+
+for.inc.us:                                       ; preds = %cond.end.us, %for.body.us
+  %3 = phi i32 [ %1, %for.body.us ], [ %4, %cond.end.us ]
+  %dec12.us = phi i16 [ %add.us, %for.body.us ], [ %dec.us, %cond.end.us ]
+  %inc.us = add i32 %i.011.us, 1
+  %phitmp.us = udiv i32 %v.010.us, 12
+  %tobool.us = icmp eq i32 %inc.us, 0
+  br i1 %tobool.us, label %for.end, label %for.body.us
+
+cond.end.us:                                      ; preds = %if.then7.us, %cond.false.us
+  %4 = phi i32 [ 0, %cond.false.us ], [ %1, %if.then7.us ]
+  %cond.us = phi i32 [ 0, %cond.false.us ], [ %v.010.us, %if.then7.us ]
+  store i32 %cond.us, i32* @g0, align 4, !tbaa !0
+  br label %for.inc.us
+
+cond.false.us:                                    ; preds = %if.then7.us
+  store i32 0, i32* @g1, align 4, !tbaa !0
+  br label %cond.end.us
+
+if.then7.us:                                      ; preds = %for.body.us
+  %dec.us = add i16 %add.us, -1
+  br i1 %tobool1.us, label %cond.end.us, label %cond.false.us
+
+for.body:                                         ; preds = %for.body.lr.ph, %for.body
+  %dec13 = phi i16 [ %dec12, %for.body ], [ %s.promoted, %for.body.lr.ph ]
+  %i.011 = phi i32 [ %inc, %for.body ], [ undef, %for.body.lr.ph ]
+  %v.010 = phi i32 [ %phitmp, %for.body ], [ 1, %for.body.lr.ph ]
+  %tobool1 = icmp eq i32 %v.010, 0
+  %lnot.ext = zext i1 %tobool1 to i16
+  %add = add i16 %dec13, %lnot.ext
+  %conv3 = zext i16 %add to i32
+  %add4 = sub i32 0, %.pre
+  %not.tobool5 = icmp ne i32 %conv3, %add4
+  %dec = sext i1 %not.tobool5 to i16
+  %dec12 = add i16 %add, %dec
+  %inc = add i32 %i.011, 1
+  %phitmp = udiv i32 %v.010, 12
+  %tobool = icmp eq i32 %inc, 0
+  br i1 %tobool, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.inc.us, %for.body
+  %dec12.lcssa = phi i16 [ %dec12.us, %for.inc.us ], [ %dec12, %for.body ]
+  store i16 %dec12.lcssa, i16* @s, align 2
+  ret void
+}
+
+!0 = metadata !{metadata !"int", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}