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introduce a new RoundUpAlignment helper function, use it to

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remove some more 64-bit divs and rems from the StructLayout 
ctor.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60692 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-12-08 07:11:56 +00:00
parent 149cfc3519
commit bedb8c1d35
2 changed files with 40 additions and 37 deletions
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16
include/llvm/Target/TargetData.h
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@ -178,12 +178,8 @@ public:
/// that alloca reserves for this type. For example, returns 12 or 16 for
/// x86_fp80, depending on alignment.
uint64_t getABITypeSize(const Type* Ty) const {
// The alignment of a type is always a power of two.
unsigned char AlignMinusOne = getABITypeAlignment(Ty)-1;
// Round up to the next alignment boundary.
uint64_t RoundUp = getTypeStoreSize(Ty) + AlignMinusOne;
return RoundUp &= ~uint64_t(AlignMinusOne);
return RoundUpAlignment(getTypeStoreSize(Ty), getABITypeAlignment(Ty));
}
/// getABITypeSizeInBits - Return the offset in bits between successive
@ -244,6 +240,16 @@ public:
/// requested alignment (if the global has one).
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const;
/// RoundUpAlignment - Round the specified value up to the next alignment
/// boundary specified by Alignment. For example, 7 rounded up to an
/// alignment boundary of 4 is 8. 8 rounded up to the alignment boundary of 4
/// is 8 because it is already aligned.
template <typename UIntTy>
static UIntTy RoundUpAlignment(UIntTy Val, unsigned Alignment) {
assert((Alignment & (Alignment-1)) == 0 && "Alignment must be power of 2!");
return (Val + (Alignment-1)) & ~UIntTy(Alignment-1);
}
static char ID; // Pass identification, replacement for typeid
};