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InstCombine: Improve the result bitvect type when folding (cmp pred (load (gep GV, i)) C) to a bit test.

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The original code used i32, and i64 if legal. This introduced unneeded
casts when they aren't legal, or when the index variable i has another
type. In order of preference: try to use i's type; use the smallest
fitting legal type (using an added DataLayout method); default to i32.
A testcase checks that this works when the index gep operand is i16.

Patch by : Ahmed Bougacha <ahmed.bougacha@gmail.com>
Reviewed by : Duncan

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177712 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnaud A. de Grandmaison
2013-03-22 08:25:01 +00:00
parent 9b294d4056
commit 2be921adc4
4 changed files with 43 additions and 11 deletions
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7
lib/IR/DataLayout.cpp
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@ -621,6 +621,13 @@ Type *DataLayout::getIntPtrType(Type *Ty) const {
return IntTy;
}
Type *DataLayout::getSmallestLegalIntType(LLVMContext &C, unsigned Width) const {
for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
if (Width <= LegalIntWidths[i])
return Type::getIntNTy(C, LegalIntWidths[i]);
return 0;
}
uint64_t DataLayout::getIndexedOffset(Type *ptrTy,
ArrayRef<Value *> Indices) const {
Type *Ty = ptrTy;