1 files changed, 46 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2014-08-29-CompactUnwind.ll b/test/CodeGen/X86/2014-08-29-CompactUnwind.ll
new file mode 100644
index 0000000..f65d7c9
--- /dev/null
+++ b/test/CodeGen/X86/2014-08-29-CompactUnwind.ll
@@ -0,0 +1,46 @@
+; RUN: llc < %s -disable-fp-elim -mtriple x86_64-apple-darwin11 -mcpu corei7 -filetype=obj -o - | llvm-objdump -d -unwind-info -s - | FileCheck %s
+; Regression test for http://llvm.org/bugs/show_bug.cgi?id=20800.
+
+; ModuleID = 'asan_report.ii'
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.9.0"
+
+@.str = private unnamed_addr constant [3 x i8] c"=>\00", align 1
+@.str1 = private unnamed_addr constant [3 x i8] c"  \00", align 1
+@.str2 = private unnamed_addr constant [6 x i8] c"%s%p:\00", align 1
+
+; CHECK: ___asan_report_error:
+
+; subq instruction starts at 0x0a, so the second byte of the compact encoding
+; (UNWIND_X86_64_FRAMELESS_STACK_SIZE in mach-o/compact_unwind_encoding.h)
+; must be 0x0d.
+; CHECK: {{a:.*subq.*%rsp}}
+
+; CHECK: Contents of __compact_unwind section
+; CHECK: ___asan_report_error
+
+; Because of incorrect push instruction size in X86AsmBackend.cpp the stack
+; size was also calculated incorrectly.
+; CHECK-NOT: {{compact encoding:.*0x0309f800}}
+; CHECK: {{compact encoding:.*0x030df800}}
+
+define void @__asan_report_error() #0 {
+  %str.i = alloca i64, align 8
+  %stack = alloca [256 x i64], align 8
+  br label %print_shadow_bytes.exit.i
+
+print_shadow_bytes.exit.i: ; preds = %print_shadow_bytes.exit.i, %0
+  %iv.i = phi i64 [ -5, %0 ], [ %iv.next.i, %print_shadow_bytes.exit.i ]
+  %reg15 = icmp eq i64 %iv.i, 0
+  %.str..str1.i = select i1 %reg15, [3 x i8]* @.str, [3 x i8]* @.str1
+  %reg16 = getelementptr inbounds [3 x i8]* %.str..str1.i, i64 0, i64 0
+  %reg17 = shl i64 %iv.i, 1
+  %reg19 = inttoptr i64 %reg17 to i8*
+  call void (i64*, i8*, ...)* @append(i64* %str.i, i8* getelementptr inbounds ([6 x i8]* @.str2, i64 0, i64 0), i8* %reg16, i8* %reg19)
+  %iv.next.i = add nsw i64 %iv.i, 0
+  br label %print_shadow_bytes.exit.i
+}
+
+declare void @append(i64*, i8*, ...)
+
+attributes #0 = { "no-frame-pointer-elim"="false" }