%RCX is not a function live-out in eh.return functions.

The function live-out registers must be live at all function returns,
and %RCX is only used by eh.return. When a function also has a normal
return, only %RAX holds a return value.

This fixes PR13188.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159116 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 252 insertions, 0 deletions

diff --git a/test/CodeGen/X86/unwindraise.ll b/test/CodeGen/X86/unwindraise.ll
new file mode 100644
index 0000000000..a438723d9b
--- /dev/null
+++ b/test/CodeGen/X86/unwindraise.ll
@@ -0,0 +1,252 @@
+; RUN: llc < %s -verify-machineinstrs
+; PR13188
+;
+; The _Unwind_RaiseException function can return normally and via eh.return.
+; This causes confusion about the function live-out registers, since the two
+; different ways of returning have different return values.
+;
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-freebsd9.0"
+
+%struct._Unwind_Context = type { [18 x i8*], i8*, i8*, i8*, %struct.dwarf_eh_bases, i64, i64, i64, [18 x i8] }
+%struct.dwarf_eh_bases = type { i8*, i8*, i8* }
+%struct._Unwind_FrameState = type { %struct.frame_state_reg_info, i64, i64, i8*, i32, i8*, i32 (i32, i32, i64, %struct._Unwind_Exception*, %struct._Unwind_Context*)*, i64, i64, i64, i8, i8, i8, i8, i8* }
+%struct.frame_state_reg_info = type { [18 x %struct.anon], %struct.frame_state_reg_info* }
+%struct.anon = type { %union.anon, i32 }
+%union.anon = type { i64 }
+%struct._Unwind_Exception = type { i64, void (i32, %struct._Unwind_Exception*)*, i64, i64 }
+
+@dwarf_reg_size_table = external hidden unnamed_addr global [18 x i8], align 16
+
+declare void @abort() noreturn
+
+declare fastcc i32 @uw_frame_state_for(%struct._Unwind_Context*, %struct._Unwind_FrameState*) uwtable
+
+define hidden i32 @_Unwind_RaiseException(%struct._Unwind_Exception* %exc) uwtable {
+entry:
+  %fs.i = alloca %struct._Unwind_FrameState, align 8
+  %this_context = alloca %struct._Unwind_Context, align 8
+  %cur_context = alloca %struct._Unwind_Context, align 8
+  %fs = alloca %struct._Unwind_FrameState, align 8
+  call void @llvm.eh.unwind.init()
+  %0 = call i8* @llvm.eh.dwarf.cfa(i32 0)
+  %1 = call i8* @llvm.returnaddress(i32 0)
+  call fastcc void @uw_init_context_1(%struct._Unwind_Context* %this_context, i8* %0, i8* %1)
+  %2 = bitcast %struct._Unwind_Context* %cur_context to i8*
+  %3 = bitcast %struct._Unwind_Context* %this_context to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %2, i8* %3, i64 240, i32 8, i1 false)
+  %personality = getelementptr inbounds %struct._Unwind_FrameState* %fs, i64 0, i32 6
+  %retaddr_column.i = getelementptr inbounds %struct._Unwind_FrameState* %fs, i64 0, i32 9
+  %flags.i.i.i.i = getelementptr inbounds %struct._Unwind_Context* %cur_context, i64 0, i32 5
+  %ra.i = getelementptr inbounds %struct._Unwind_Context* %cur_context, i64 0, i32 2
+  %exception_class = getelementptr inbounds %struct._Unwind_Exception* %exc, i64 0, i32 0
+  br label %while.body
+
+while.body:                                       ; preds = %uw_update_context.exit, %entry
+  %call = call fastcc i32 @uw_frame_state_for(%struct._Unwind_Context* %cur_context, %struct._Unwind_FrameState* %fs)
+  switch i32 %call, label %do.end21 [
+    i32 5, label %do.end21.loopexit46
+    i32 0, label %if.end3
+  ]
+
+if.end3:                                          ; preds = %while.body
+  %4 = load i32 (i32, i32, i64, %struct._Unwind_Exception*, %struct._Unwind_Context*)** %personality, align 8, !tbaa !0
+  %tobool = icmp eq i32 (i32, i32, i64, %struct._Unwind_Exception*, %struct._Unwind_Context*)* %4, null
+  br i1 %tobool, label %if.end13, label %if.then4
+
+if.then4:                                         ; preds = %if.end3
+  %5 = load i64* %exception_class, align 8, !tbaa !3
+  %call6 = call i32 %4(i32 1, i32 1, i64 %5, %struct._Unwind_Exception* %exc, %struct._Unwind_Context* %cur_context)
+  switch i32 %call6, label %do.end21.loopexit46 [
+    i32 6, label %while.end
+    i32 8, label %if.end13
+  ]
+
+if.end13:                                         ; preds = %if.then4, %if.end3
+  call fastcc void @uw_update_context_1(%struct._Unwind_Context* %cur_context, %struct._Unwind_FrameState* %fs)
+  %6 = load i64* %retaddr_column.i, align 8, !tbaa !3
+  %conv.i = trunc i64 %6 to i32
+  %cmp.i.i.i = icmp slt i32 %conv.i, 18
+  br i1 %cmp.i.i.i, label %cond.end.i.i.i, label %cond.true.i.i.i
+
+cond.true.i.i.i:                                  ; preds = %if.end13
+  call void @abort() noreturn
+  unreachable
+
+cond.end.i.i.i:                                   ; preds = %if.end13
+  %sext.i = shl i64 %6, 32
+  %idxprom.i.i.i = ashr exact i64 %sext.i, 32
+  %arrayidx.i.i.i = getelementptr inbounds [18 x i8]* @dwarf_reg_size_table, i64 0, i64 %idxprom.i.i.i
+  %7 = load i8* %arrayidx.i.i.i, align 1, !tbaa !1
+  %arrayidx2.i.i.i = getelementptr inbounds %struct._Unwind_Context* %cur_context, i64 0, i32 0, i64 %idxprom.i.i.i
+  %8 = load i8** %arrayidx2.i.i.i, align 8, !tbaa !0
+  %9 = load i64* %flags.i.i.i.i, align 8, !tbaa !3
+  %and.i.i.i.i = and i64 %9, 4611686018427387904
+  %tobool.i.i.i = icmp eq i64 %and.i.i.i.i, 0
+  br i1 %tobool.i.i.i, label %if.end.i.i.i, label %land.lhs.true.i.i.i
+
+land.lhs.true.i.i.i:                              ; preds = %cond.end.i.i.i
+  %arrayidx4.i.i.i = getelementptr inbounds %struct._Unwind_Context* %cur_context, i64 0, i32 8, i64 %idxprom.i.i.i
+  %10 = load i8* %arrayidx4.i.i.i, align 1, !tbaa !1
+  %tobool6.i.i.i = icmp eq i8 %10, 0
+  br i1 %tobool6.i.i.i, label %if.end.i.i.i, label %if.then.i.i.i
+
+if.then.i.i.i:                                    ; preds = %land.lhs.true.i.i.i
+  %11 = ptrtoint i8* %8 to i64
+  br label %uw_update_context.exit
+
+if.end.i.i.i:                                     ; preds = %land.lhs.true.i.i.i, %cond.end.i.i.i
+  %cmp8.i.i.i = icmp eq i8 %7, 8
+  br i1 %cmp8.i.i.i, label %if.then10.i.i.i, label %cond.true14.i.i.i
+
+if.then10.i.i.i:                                  ; preds = %if.end.i.i.i
+  %12 = bitcast i8* %8 to i64*
+  %13 = load i64* %12, align 8, !tbaa !3
+  br label %uw_update_context.exit
+
+cond.true14.i.i.i:                                ; preds = %if.end.i.i.i
+  call void @abort() noreturn
+  unreachable
+
+uw_update_context.exit:                           ; preds = %if.then10.i.i.i, %if.then.i.i.i
+  %retval.0.i.i.i = phi i64 [ %11, %if.then.i.i.i ], [ %13, %if.then10.i.i.i ]
+  %14 = inttoptr i64 %retval.0.i.i.i to i8*
+  store i8* %14, i8** %ra.i, align 8, !tbaa !0
+  br label %while.body
+
+while.end:                                        ; preds = %if.then4
+  %private_1 = getelementptr inbounds %struct._Unwind_Exception* %exc, i64 0, i32 2
+  store i64 0, i64* %private_1, align 8, !tbaa !3
+  %15 = load i8** %ra.i, align 8, !tbaa !0
+  %16 = ptrtoint i8* %15 to i64
+  %private_2 = getelementptr inbounds %struct._Unwind_Exception* %exc, i64 0, i32 3
+  store i64 %16, i64* %private_2, align 8, !tbaa !3
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %2, i8* %3, i64 240, i32 8, i1 false)
+  %17 = bitcast %struct._Unwind_FrameState* %fs.i to i8*
+  call void @llvm.lifetime.start(i64 -1, i8* %17)
+  %personality.i = getelementptr inbounds %struct._Unwind_FrameState* %fs.i, i64 0, i32 6
+  %retaddr_column.i22 = getelementptr inbounds %struct._Unwind_FrameState* %fs.i, i64 0, i32 9
+  br label %while.body.i
+
+while.body.i:                                     ; preds = %uw_update_context.exit44, %while.end
+  %call.i = call fastcc i32 @uw_frame_state_for(%struct._Unwind_Context* %cur_context, %struct._Unwind_FrameState* %fs.i)
+  %18 = load i8** %ra.i, align 8, !tbaa !0
+  %19 = ptrtoint i8* %18 to i64
+  %20 = load i64* %private_2, align 8, !tbaa !3
+  %cmp.i = icmp eq i64 %19, %20
+  %cmp2.i = icmp eq i32 %call.i, 0
+  br i1 %cmp2.i, label %if.end.i, label %do.end21
+
+if.end.i:                                         ; preds = %while.body.i
+  %21 = load i32 (i32, i32, i64, %struct._Unwind_Exception*, %struct._Unwind_Context*)** %personality.i, align 8, !tbaa !0
+  %tobool.i = icmp eq i32 (i32, i32, i64, %struct._Unwind_Exception*, %struct._Unwind_Context*)* %21, null
+  br i1 %tobool.i, label %if.end12.i, label %if.then3.i
+
+if.then3.i:                                       ; preds = %if.end.i
+  %or.i = select i1 %cmp.i, i32 6, i32 2
+  %22 = load i64* %exception_class, align 8, !tbaa !3
+  %call5.i = call i32 %21(i32 1, i32 %or.i, i64 %22, %struct._Unwind_Exception* %exc, %struct._Unwind_Context* %cur_context)
+  switch i32 %call5.i, label %do.end21 [
+    i32 7, label %do.body19
+    i32 8, label %if.end12.i
+  ]
+
+if.end12.i:                                       ; preds = %if.then3.i, %if.end.i
+  br i1 %cmp.i, label %cond.true.i, label %cond.end.i
+
+cond.true.i:                                      ; preds = %if.end12.i
+  call void @abort() noreturn
+  unreachable
+
+cond.end.i:                                       ; preds = %if.end12.i
+  call fastcc void @uw_update_context_1(%struct._Unwind_Context* %cur_context, %struct._Unwind_FrameState* %fs.i)
+  %23 = load i64* %retaddr_column.i22, align 8, !tbaa !3
+  %conv.i23 = trunc i64 %23 to i32
+  %cmp.i.i.i24 = icmp slt i32 %conv.i23, 18
+  br i1 %cmp.i.i.i24, label %cond.end.i.i.i33, label %cond.true.i.i.i25
+
+cond.true.i.i.i25:                                ; preds = %cond.end.i
+  call void @abort() noreturn
+  unreachable
+
+cond.end.i.i.i33:                                 ; preds = %cond.end.i
+  %sext.i26 = shl i64 %23, 32
+  %idxprom.i.i.i27 = ashr exact i64 %sext.i26, 32
+  %arrayidx.i.i.i28 = getelementptr inbounds [18 x i8]* @dwarf_reg_size_table, i64 0, i64 %idxprom.i.i.i27
+  %24 = load i8* %arrayidx.i.i.i28, align 1, !tbaa !1
+  %arrayidx2.i.i.i29 = getelementptr inbounds %struct._Unwind_Context* %cur_context, i64 0, i32 0, i64 %idxprom.i.i.i27
+  %25 = load i8** %arrayidx2.i.i.i29, align 8, !tbaa !0
+  %26 = load i64* %flags.i.i.i.i, align 8, !tbaa !3
+  %and.i.i.i.i31 = and i64 %26, 4611686018427387904
+  %tobool.i.i.i32 = icmp eq i64 %and.i.i.i.i31, 0
+  br i1 %tobool.i.i.i32, label %if.end.i.i.i39, label %land.lhs.true.i.i.i36
+
+land.lhs.true.i.i.i36:                            ; preds = %cond.end.i.i.i33
+  %arrayidx4.i.i.i34 = getelementptr inbounds %struct._Unwind_Context* %cur_context, i64 0, i32 8, i64 %idxprom.i.i.i27
+  %27 = load i8* %arrayidx4.i.i.i34, align 1, !tbaa !1
+  %tobool6.i.i.i35 = icmp eq i8 %27, 0
+  br i1 %tobool6.i.i.i35, label %if.end.i.i.i39, label %if.then.i.i.i37
+
+if.then.i.i.i37:                                  ; preds = %land.lhs.true.i.i.i36
+  %28 = ptrtoint i8* %25 to i64
+  br label %uw_update_context.exit44
+
+if.end.i.i.i39:                                   ; preds = %land.lhs.true.i.i.i36, %cond.end.i.i.i33
+  %cmp8.i.i.i38 = icmp eq i8 %24, 8
+  br i1 %cmp8.i.i.i38, label %if.then10.i.i.i40, label %cond.true14.i.i.i41
+
+if.then10.i.i.i40:                                ; preds = %if.end.i.i.i39
+  %29 = bitcast i8* %25 to i64*
+  %30 = load i64* %29, align 8, !tbaa !3
+  br label %uw_update_context.exit44
+
+cond.true14.i.i.i41:                              ; preds = %if.end.i.i.i39
+  call void @abort() noreturn
+  unreachable
+
+uw_update_context.exit44:                         ; preds = %if.then10.i.i.i40, %if.then.i.i.i37
+  %retval.0.i.i.i42 = phi i64 [ %28, %if.then.i.i.i37 ], [ %30, %if.then10.i.i.i40 ]
+  %31 = inttoptr i64 %retval.0.i.i.i42 to i8*
+  store i8* %31, i8** %ra.i, align 8, !tbaa !0
+  br label %while.body.i
+
+do.body19:                                        ; preds = %if.then3.i
+  call void @llvm.lifetime.end(i64 -1, i8* %17)
+  %call20 = call fastcc i64 @uw_install_context_1(%struct._Unwind_Context* %this_context, %struct._Unwind_Context* %cur_context)
+  %32 = load i8** %ra.i, align 8, !tbaa !0
+  call void @llvm.eh.return.i64(i64 %call20, i8* %32)
+  unreachable
+
+do.end21.loopexit46:                              ; preds = %if.then4, %while.body
+  %retval.0.ph = phi i32 [ 3, %if.then4 ], [ 5, %while.body ]
+  br label %do.end21
+
+do.end21:                                         ; preds = %do.end21.loopexit46, %if.then3.i, %while.body.i, %while.body
+  %retval.0 = phi i32 [ %retval.0.ph, %do.end21.loopexit46 ], [ 3, %while.body ], [ 2, %while.body.i ], [ 2, %if.then3.i ]
+  ret i32 %retval.0
+}
+
+declare void @llvm.eh.unwind.init() nounwind
+
+declare fastcc void @uw_init_context_1(%struct._Unwind_Context*, i8*, i8*) uwtable
+
+declare i8* @llvm.eh.dwarf.cfa(i32) nounwind
+
+declare i8* @llvm.returnaddress(i32) nounwind readnone
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
+
+declare fastcc i64 @uw_install_context_1(%struct._Unwind_Context*, %struct._Unwind_Context*) uwtable
+
+declare void @llvm.eh.return.i64(i64, i8*) nounwind
+
+declare fastcc void @uw_update_context_1(%struct._Unwind_Context*, %struct._Unwind_FrameState* nocapture) uwtable
+
+declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
+
+declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
+
+!0 = metadata !{metadata !"any pointer", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}
+!3 = metadata !{metadata !"long", metadata !1}