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Fix PR1749 and InstCombine/2007-10-28-EmptyField.ll by handling

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zero-length fields better.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43427 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-10-29 02:40:02 +00:00
parent 3cb63ddd51
commit b361ec3197
2 changed files with 31 additions and 1 deletions
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8
lib/Target/TargetData.cpp
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@@ -83,9 +83,15 @@ unsigned StructLayout::getElementContainingOffset(uint64_t Offset) const {
assert(SI != &MemberOffsets[0] && "Offset not in structure type!");
--SI;
assert(*SI <= Offset && "upper_bound didn't work");
assert((SI == &MemberOffsets[0] || *(SI-1) < Offset) &&
assert((SI == &MemberOffsets[0] || *(SI-1) <= Offset) &&
(SI+1 == &MemberOffsets[NumElements] || *(SI+1) > Offset) &&
"Upper bound didn't work!");
// Multiple fields can have the same offset if any of them are zero sized.
// For example, in { i32, [0 x i32], i32 }, searching for offset 4 will stop
// at the i32 element, because it is the last element at that offset. This is
// the right one to return, because anything after it will have a higher
// offset, implying that this element is non-empty.
return SI-&MemberOffsets[0];
}