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TargetLowering: Add getVectorIdxTy() function v2

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This virtual function can be implemented by targets to specify the type
to use for the index operand of INSERT_VECTOR_ELT, EXTRACT_VECTOR_ELT,
INSERT_SUBVECTOR, EXTRACT_SUBVECTOR.  The default implementation returns
the result from TargetLowering::getPointerTy()

The previous code was using TargetLowering::getPointerTy() for vector
indices, because this is guaranteed to be legal on all targets.  However,
using TargetLowering::getPointerTy() can be a problem for targets with
pointer sizes that differ across address spaces.  On such targets,
when vectors need to be loaded or stored to an address space other than the
default 'zero' address space (which is the address space assumed by
TargetLowering::getPointerTy()), having an index that
is a different size than the pointer can lead to inefficient
pointer calculations, (e.g. 64-bit adds for a 32-bit address space).

There is no intended functionality change with this patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187748 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard
2013-08-05 22:22:01 +00:00
parent de5cb6b249
commit 425b76c231
9 changed files with 105 additions and 77 deletions
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7
include/llvm/Target/TargetLowering.h
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@@ -156,6 +156,13 @@ public:
EVT getShiftAmountTy(EVT LHSTy) const;
/// Returns the type to be used for the index operand of:
/// ISD::INSERT_VECTOR_ELT, ISD::EXTRACT_VECTOR_ELT,
/// ISD::INSERT_SUBVECTOR, and ISD::EXTRACT_SUBVECTOR
virtual MVT getVectorIdxTy() const {
return getPointerTy();
}
/// Return true if the select operation is expensive for this target.
bool isSelectExpensive() const { return SelectIsExpensive; }