new testcase, miscompiled by simplifycfg. This has been distilled from Ptrdist/bc

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24580 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 138 insertions, 0 deletions

diff --git a/test/Transforms/SimplifyCFG/2005-12-03-IncorrectPHIFold.ll b/test/Transforms/SimplifyCFG/2005-12-03-IncorrectPHIFold.ll
new file mode 100644
index 0000000..18cbc17
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/2005-12-03-IncorrectPHIFold.ll
@@ -0,0 +1,138 @@
+; Make sure this doesn't turn into an infinite loop
+
+; RUN: llvm-as < %s | opt -simplifycfg -constprop -simplifycfg | llvm-dis | grep bb86
+
+	%struct.anon = type { uint, int, int, int, [1024 x sbyte] }
+%_zero_ = external global %struct.anon*		; <%struct.anon**> [#uses=2]
+%_one_ = external global %struct.anon*		; <%struct.anon**> [#uses=4]
+%str = internal constant [4 x sbyte] c"%d\0A\00"		; <[4 x sbyte]*> [#uses=1]
+
+implementation   ; Functions:
+
+
+declare int %bc_compare(%struct.anon*, %struct.anon*)
+
+declare void %free_num(%struct.anon**)
+
+declare %struct.anon* %copy_num(%struct.anon*)
+
+declare void %init_num(%struct.anon**)
+
+declare %struct.anon* %new_num(int, int)
+
+declare void %int2num(%struct.anon**, int)
+
+declare void %bc_multiply(%struct.anon*, %struct.anon*, %struct.anon**, int)
+
+declare void %bc_raise(%struct.anon*, %struct.anon*, %struct.anon**, int)
+
+declare int %bc_divide(%struct.anon*, %struct.anon*, %struct.anon**, int)
+
+declare void %bc_add(%struct.anon*, %struct.anon*, %struct.anon**)
+
+declare int %_do_compare(%struct.anon*, %struct.anon*, int, int)
+
+declare int %printf(sbyte*, ...)
+
+int %bc_sqrt(%struct.anon** %num, int %scale) {
+entry:
+	%guess = alloca %struct.anon*		; <%struct.anon**> [#uses=15]
+	%guess1 = alloca %struct.anon*		; <%struct.anon**> [#uses=12]
+	%point5 = alloca %struct.anon*		; <%struct.anon**> [#uses=4]
+	%tmp = load %struct.anon** %num		; <%struct.anon*> [#uses=1]
+	%tmp1 = load %struct.anon** %_zero_		; <%struct.anon*> [#uses=1]
+	%tmp = call int %bc_compare( %struct.anon* %tmp, %struct.anon* %tmp1 )		; <int> [#uses=2]
+	%tmp = setlt int %tmp, 0		; <bool> [#uses=1]
+	br bool %tmp, label %cond_true, label %cond_false
+
+cond_true:		; preds = %entry
+	ret int 0
+
+cond_false:		; preds = %entry
+	%tmp5 = seteq int %tmp, 0		; <bool> [#uses=1]
+	br bool %tmp5, label %cond_true6, label %cond_next13
+
+cond_true6:		; preds = %cond_false
+	call void %free_num( %struct.anon** %num )
+	%tmp8 = load %struct.anon** %_zero_		; <%struct.anon*> [#uses=1]
+	%tmp9 = call %struct.anon* %copy_num( %struct.anon* %tmp8 )		; <%struct.anon*> [#uses=1]
+	store %struct.anon* %tmp9, %struct.anon** %num
+	ret int 1
+
+cond_next13:		; preds = %cond_false
+	%tmp15 = load %struct.anon** %num		; <%struct.anon*> [#uses=1]
+	%tmp16 = load %struct.anon** %_one_		; <%struct.anon*> [#uses=1]
+	%tmp17 = call int %bc_compare( %struct.anon* %tmp15, %struct.anon* %tmp16 )		; <int> [#uses=2]
+	%tmp19 = seteq int %tmp17, 0		; <bool> [#uses=1]
+	br bool %tmp19, label %cond_true20, label %cond_next27
+
+cond_true20:		; preds = %cond_next13
+	call void %free_num( %struct.anon** %num )
+	%tmp22 = load %struct.anon** %_one_		; <%struct.anon*> [#uses=1]
+	%tmp23 = call %struct.anon* %copy_num( %struct.anon* %tmp22 )		; <%struct.anon*> [#uses=1]
+	store %struct.anon* %tmp23, %struct.anon** %num
+	ret int 1
+
+cond_next27:		; preds = %cond_next13
+	%tmp29 = load %struct.anon** %num		; <%struct.anon*> [#uses=1]
+	%tmp30 = getelementptr %struct.anon* %tmp29, int 0, uint 2		; <int*> [#uses=1]
+	%tmp31 = load int* %tmp30		; <int> [#uses=2]
+	%tmp33 = setge int %tmp31, %scale		; <bool> [#uses=1]
+	%max = select bool %tmp33, int %tmp31, int %scale		; <int> [#uses=4]
+	%tmp35 = add int %max, 2		; <int> [#uses=2]
+	call void %init_num( %struct.anon** %guess )
+	call void %init_num( %struct.anon** %guess1 )
+	%tmp36 = call %struct.anon* %new_num( int 1, int 1 )		; <%struct.anon*> [#uses=2]
+	store %struct.anon* %tmp36, %struct.anon** %point5
+	%tmp = getelementptr %struct.anon* %tmp36, int 0, uint 4, int 1		; <sbyte*> [#uses=1]
+	store sbyte 5, sbyte* %tmp
+	%tmp39 = setlt int %tmp17, 0		; <bool> [#uses=1]
+	br bool %tmp39, label %cond_true40, label %cond_false43
+
+cond_true40:		; preds = %cond_next27
+	%tmp41 = load %struct.anon** %_one_		; <%struct.anon*> [#uses=1]
+	%tmp42 = call %struct.anon* %copy_num( %struct.anon* %tmp41 )		; <%struct.anon*> [#uses=1]
+	store %struct.anon* %tmp42, %struct.anon** %guess
+	br label %bb80.outer
+
+cond_false43:		; preds = %cond_next27
+	call void %int2num( %struct.anon** %guess, int 10 )
+	%tmp45 = load %struct.anon** %num		; <%struct.anon*> [#uses=1]
+	%tmp46 = getelementptr %struct.anon* %tmp45, int 0, uint 1		; <int*> [#uses=1]
+	%tmp47 = load int* %tmp46		; <int> [#uses=1]
+	call void %int2num( %struct.anon** %guess1, int %tmp47 )
+	%tmp48 = load %struct.anon** %guess1		; <%struct.anon*> [#uses=1]
+	%tmp49 = load %struct.anon** %point5		; <%struct.anon*> [#uses=1]
+	call void %bc_multiply( %struct.anon* %tmp48, %struct.anon* %tmp49, %struct.anon** %guess1, int %max )
+	%tmp51 = load %struct.anon** %guess1		; <%struct.anon*> [#uses=1]
+	%tmp52 = getelementptr %struct.anon* %tmp51, int 0, uint 2		; <int*> [#uses=1]
+	store int 0, int* %tmp52
+	%tmp53 = load %struct.anon** %guess		; <%struct.anon*> [#uses=1]
+	%tmp54 = load %struct.anon** %guess1		; <%struct.anon*> [#uses=1]
+	call void %bc_raise( %struct.anon* %tmp53, %struct.anon* %tmp54, %struct.anon** %guess, int %max )
+	br label %bb80.outer
+
+bb80.outer:		; preds = %cond_true77, %cond_next56
+	%done.1.ph = phi int [ 1, %cond_true83 ], [0, %cond_true40], [0, %cond_false43]		; <int> [#uses=1]
+	br label %bb80
+
+bb80:		; preds = %bb80.outer, %cond_true83
+	%tmp82 = seteq int %done.1.ph, 0		; <bool> [#uses=1]
+	br bool %tmp82, label %cond_true83, label %bb86
+
+cond_true83:		; preds = %bb80
+	%tmp71 = call int %_do_compare( %struct.anon* null, %struct.anon* null, int 0, int 1 )		; <int> [#uses=2]
+	%tmp76 = seteq int %tmp71, 0		; <bool> [#uses=1]
+	br bool %tmp76, label %bb80.outer, label %bb80
+
+bb86:		; preds = %bb80
+	call void %free_num( %struct.anon** %num )
+	%tmp88 = load %struct.anon** %guess		; <%struct.anon*> [#uses=1]
+	%tmp89 = load %struct.anon** %_one_		; <%struct.anon*> [#uses=1]
+	%tmp92 = call int %bc_divide( %struct.anon* %tmp88, %struct.anon* %tmp89, %struct.anon** %num, int %max )		; <int> [#uses=0]
+	call void %free_num( %struct.anon** %guess )
+	call void %free_num( %struct.anon** %guess1 )
+	call void %free_num( %struct.anon** %point5 )
+	ret int 1
+}
+