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Fix PR9331. Simplified version of a patch by Jakub Staszak.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127243 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2011-03-08 12:39:03 +00:00
parent c61ac5120d
commit 606199fb85
2 changed files with 54 additions and 0 deletions
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4
lib/Analysis/ValueTracking.cpp
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@ -610,6 +610,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
// Otherwise take the unions of the known bit sets of the operands,
// taking conservative care to avoid excessive recursion.
if (Depth < MaxDepth - 1 && !KnownZero && !KnownOne) {
// Skip if every incoming value references to ourself.
if (P->hasConstantValue() == P)
break;
KnownZero = APInt::getAllOnesValue(BitWidth);
KnownOne = APInt::getAllOnesValue(BitWidth);
for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) {

50
test/Transforms/JumpThreading/pr9331.ll Normal file
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@ -0,0 +1,50 @@
; RUN: opt -jump-threading -S < %s
define void @func(i8 zeroext %p_44) nounwind {
entry:
br i1 false, label %for.cond2, label %if.end50
for.cond2: ; preds = %for.inc46, %lor.end, %entry
%p_44.addr.1 = phi i8 [ %p_44.addr.1, %lor.end ], [ %p_44, %entry ], [ %p_44.addr.1, %for.inc46 ]
br i1 undef, label %for.inc46, label %for.body5
for.body5: ; preds = %for.cond2
br i1 undef, label %lbl_465, label %if.then9
if.then9: ; preds = %for.body5
br label %return
lbl_465: ; preds = %lbl_465, %for.body5
%tobool19 = icmp eq i8 undef, 0
br i1 %tobool19, label %if.end21, label %lbl_465
if.end21: ; preds = %lbl_465
%conv23 = zext i8 %p_44.addr.1 to i64
%xor = xor i64 %conv23, 1
%tobool.i = icmp eq i64 %conv23, 0
br i1 %tobool.i, label %cond.false.i, label %safe_mod_func_uint64_t_u_u.exit
cond.false.i: ; preds = %if.end21
%div.i = udiv i64 %xor, %conv23
br label %safe_mod_func_uint64_t_u_u.exit
safe_mod_func_uint64_t_u_u.exit: ; preds = %cond.false.i, %if.end21
%cond.i = phi i64 [ %div.i, %cond.false.i ], [ %conv23, %if.end21 ]
%tobool28 = icmp eq i64 %cond.i, 0
br i1 %tobool28, label %lor.rhs, label %lor.end
lor.rhs: ; preds = %safe_mod_func_uint64_t_u_u.exit
br label %lor.end
lor.end: ; preds = %lor.rhs, %safe_mod_func_uint64_t_u_u.exit
br label %for.cond2
for.inc46: ; preds = %for.cond2
br label %for.cond2
if.end50: ; preds = %entry
br label %return
return: ; preds = %if.end50, %if.then9
ret void
}