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Speed up getABITypeSize by turning a i64 mul and div into an

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AND.  This is speedup on any reasonable target, but particularly
on 32-bit targets where this often turns into a libcall like udivdi3.

We know that alignments are a power of two but the compiler doesn't.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60688 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-12-08 06:50:51 +00:00
parent 295d4e953a
commit 0a3ba71a05
1 changed files with 6 additions and 2 deletions
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8
include/llvm/Target/TargetData.h
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@ -178,8 +178,12 @@ 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 {
unsigned char Align = getABITypeAlignment(Ty);
return (getTypeStoreSize(Ty) + Align - 1)/Align*Align;
// 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);
}
/// getABITypeSizeInBits - Return the offset in bits between successive