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

diff --git a/test/Transforms/SimplifyCFG/2005-12-03-IncorrectPHIFold.ll b/test/Transforms/SimplifyCFG/2005-12-03-IncorrectPHIFold.ll
new file mode 100644 (file)
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
+}
+