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fix PR4848 an infinite loop when indexing down through a recursive gep 

and we get the original pointer type.  This doesn't mean that we're
at the first pointer being indexed.  Correct the predicate.

llvm-svn: 80762
This commit is contained in:
Chris Lattner 2009-09-02 05:35:45 +00:00
parent 64b5842986
commit 950e60ea97
2 changed files with 25 additions and 1 deletions
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2
llvm/lib/Analysis/ConstantFolding.cpp
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@ -172,7 +172,7 @@ static Constant *SymbolicallyEvaluateGEP(Constant* const* Ops, unsigned NumOps,
do {
if (const SequentialType *ATy = dyn_cast<SequentialType>(Ty)) {
// The only pointer indexing we'll do is on the first index of the GEP.
if (isa<PointerType>(ATy) && ATy != Ptr->getType())
if (isa<PointerType>(ATy) && !NewIdxs.empty())
break;
// Determine which element of the array the offset points into.
APInt ElemSize(BitWidth, TD->getTypeAllocSize(ATy->getElementType()));

24
llvm/test/Transforms/ConstProp/2009-10-01-GEP-Crash.ll Normal file
View File

@ -0,0 +1,24 @@
; RUN: llvm-as < %s | opt -constprop | llvm-dis
; PR4848
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"
target triple = "x86_64-unknown-linux-gnu"
%0 = type { %struct.anon }
%1 = type { %0, %2, [24 x i8] }
%2 = type <{ %3, %3 }>
%3 = type { %struct.hrtimer_cpu_base*, i32, %struct.rb_root, %struct.rb_node*, %struct.pgprot, i64 ()*, [16 x i8] }
%struct.anon = type { }
%struct.hrtimer_clock_base = type { %struct.hrtimer_cpu_base*, i32, %struct.rb_root, %struct.rb_node*, %struct.pgprot, i64 ()*, %struct.pgprot, %struct.pgprot }
%struct.hrtimer_cpu_base = type { %0, [2 x %struct.hrtimer_clock_base], %struct.pgprot, i32, i64 }
%struct.pgprot = type { i64 }
%struct.rb_node = type { i64, %struct.rb_node*, %struct.rb_node* }
%struct.rb_root = type { %struct.rb_node* }
@per_cpu__hrtimer_bases = external global %1, align 8 ; <%1*> [#uses=1]
define void @init_hrtimers_cpu(i32 %cpu) nounwind noredzone section ".cpuinit.text" {
entry:
%tmp3 = getelementptr %struct.hrtimer_cpu_base* bitcast (%1* @per_cpu__hrtimer_bases to %struct.hrtimer_cpu_base*), i32 0, i32 0 ; <%0*> [#uses=1]
%tmp5 = bitcast %0* %tmp3 to i8* ; <i8*> [#uses=0]
unreachable
}