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vector casts of casts are eliminable. Transform this:

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%tmp = cast <4 x uint> %tmp to <4 x int>                ; <<4 x int>> [#uses=1]
        %tmp = cast <4 x int> %tmp to <4 x float>               ; <<4 x float>> [#uses=1]

into:

        %tmp = cast <4 x uint> %tmp to <4 x float>              ; <<4 x float>> [#uses=1]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27355 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-04-02 05:43:13 +00:00
parent a3124a3d1e
commit 4132afb0d2
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4539,6 +4539,10 @@ static bool isEliminableCastOfCast(const Type *SrcTy, const Type *MidTy,
SrcTy->getPrimitiveSize() < MidTy->getPrimitiveSize())
return true;
// Packed type conversions don't modify bits.
if (isa<PackedType>(SrcTy) && isa<PackedType>(MidTy) &&isa<PackedType>(DstTy))
return true;
return false;
}