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Fix PR7647, handling the case when 'To' ends up being

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mutated by recursive simplification.  This also enhances
ReplaceAndSimplifyAllUses to actually do a real RAUW
at the end of it, which updates any value handles
pointing to "From" to start pointing to "To".  This
seems useful for debug info and random other VH users.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108415 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-07-15 06:36:08 +00:00
parent 35a939b97d
commit d2bfe54b0a
2 changed files with 81 additions and 14 deletions
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test/Transforms/JumpThreading/crash.ll
+47
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@@ -387,3 +387,50 @@ if.end: ; preds = %land.end69
ret void
}
; PR7647
define void @test15() nounwind {
entry:
ret void
if.then237:
br label %lbl_664
lbl_596: ; preds = %lbl_664, %for.end37
volatile store i64 undef, i64* undef, align 4
br label %for.cond111
for.cond111: ; preds = %safe_sub_func_int64_t_s_s.exit, %lbl_596
%storemerge = phi i8 [ undef, %cond.true.i100 ], [ 22, %lbl_596 ] ; <i8> [#uses=1]
%l_678.5 = phi i64 [ %l_678.3, %cond.true.i100 ], [ undef, %lbl_596 ] ; <i64> [#uses=2]
%cmp114 = icmp slt i8 %storemerge, -2 ; <i1> [#uses=1]
br i1 %cmp114, label %lbl_664, label %if.end949
lbl_664: ; preds = %for.end1058, %if.then237, %for.cond111
%l_678.3 = phi i64 [ %l_678.5, %for.cond111 ], [ %l_678.2, %for.cond1035 ], [ 5, %if.then237 ] ; <i64> [#uses=1]
%tobool118 = icmp eq i32 undef, 0 ; <i1> [#uses=1]
br i1 %tobool118, label %cond.true.i100, label %lbl_596
cond.true.i100: ; preds = %for.inc120
br label %for.cond111
lbl_709:
br label %if.end949
for.cond603: ; preds = %for.body607, %if.end336
br i1 undef, label %for.cond603, label %if.end949
if.end949: ; preds = %for.cond603, %lbl_709, %for.cond111
%l_678.2 = phi i64 [ %l_678.5, %for.cond111 ], [ undef, %lbl_709 ], [ 5, %for.cond603 ] ; <i64> [#uses=1]
br label %for.body1016
for.body1016: ; preds = %for.cond1012
br label %for.body1016
for.cond1035: ; preds = %for.inc1055, %if.then1026
br i1 undef, label %for.cond1040, label %lbl_664
for.cond1040: ; preds = %for.body1044, %for.cond1035
ret void
}