[llvm] r179887 - Add a testcase to make sure we generate the proper compact unwind section for a function that cannot produce a compact unwind encoding.

[Bill Wendling]

Author: void
Date: Fri Apr 19 16:07:11 2013
New Revision: 179887

URL: http://llvm.org/viewvc/llvm-project?rev=179887&view=rev
Log:
Add a testcase to make sure we generate the proper compact unwind section for a function that cannot produce a compact unwind encoding.

Added:
    llvm/trunk/test/CodeGen/X86/no-compact-unwind.ll

Added: llvm/trunk/test/CodeGen/X86/no-compact-unwind.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/no-compact-unwind.ll?rev=179887&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/X86/no-compact-unwind.ll (added)
+++ llvm/trunk/test/CodeGen/X86/no-compact-unwind.ll Fri Apr 19 16:07:11 2013
@@ -0,0 +1,60 @@
+; RUN: llc < %s -mtriple x86_64-apple-macosx10.8.0 -disable-cfi | FileCheck %s
+
+%"struct.dyld::MappedRanges" = type { [400 x %struct.anon], %"struct.dyld::MappedRanges"* }
+%struct.anon = type { %class.ImageLoader*, i64, i64 }
+%class.ImageLoader = type { i32 (...)**, i8*, i8*, i32, i64, i64, i32, i32, %"struct.ImageLoader::recursive_lock"*, i16, i16, [4 x i8] }
+%"struct.ImageLoader::recursive_lock" = type { i32, i32 }
+
+ at _ZN4dyldL18sMappedRangesStartE = external hidden global %"struct.dyld::MappedRanges", align 8
+
+declare void @OSMemoryBarrier() optsize
+
+; This compact unwind encoding indicates that we could not generate correct
+; compact unwind encodings for this function. This then defaults to using the
+; DWARF EH frame.
+;
+; CHECK: .section __LD,__compact_unwind,regular,debug
+; CHECK: .quad __ZN4dyld19removedMappedRangesEP11ImageLoader
+; CHECK: .long 67108864                ## Compact Unwind Encoding: 0x4000000
+; CHECK: .quad 0                       ## Personality Function
+; CHECK: .quad 0                       ## LSDA
+;
+define void @_ZN4dyld19removedMappedRangesEP11ImageLoader(%class.ImageLoader* %image) optsize ssp uwtable {
+entry:
+  br label %for.cond1.preheader
+
+for.cond1.preheader:                              ; preds = %for.inc10, %entry
+  %p.019 = phi %"struct.dyld::MappedRanges"* [ @_ZN4dyldL18sMappedRangesStartE, %entry ], [ %1, %for.inc10 ]
+  br label %for.body3
+
+for.body3:                                        ; preds = %for.inc, %for.cond1.preheader
+  %indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.inc ]
+  %image4 = getelementptr inbounds %"struct.dyld::MappedRanges"* %p.019, i64 0, i32 0, i64 %indvars.iv, i32 0
+  %0 = load %class.ImageLoader** %image4, align 8, !tbaa !0
+  %cmp5 = icmp eq %class.ImageLoader* %0, %image
+  br i1 %cmp5, label %if.then, label %for.inc
+
+if.then:                                          ; preds = %for.body3
+  tail call void @OSMemoryBarrier() optsize
+  store %class.ImageLoader* null, %class.ImageLoader** %image4, align 8, !tbaa !0
+  br label %for.inc
+
+for.inc:                                          ; preds = %if.then, %for.body3
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, 400
+  br i1 %exitcond, label %for.inc10, label %for.body3
+
+for.inc10:                                        ; preds = %for.inc
+  %next = getelementptr inbounds %"struct.dyld::MappedRanges"* %p.019, i64 0, i32 1
+  %1 = load %"struct.dyld::MappedRanges"** %next, align 8, !tbaa !0
+  %cmp = icmp eq %"struct.dyld::MappedRanges"* %1, null
+  br i1 %cmp, label %for.end11, label %for.cond1.preheader
+
+for.end11:                                        ; preds = %for.inc10
+  ret void
+}
+
+!0 = metadata !{metadata !"any pointer", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}