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Switch the NEON register class from QPR to DPair.

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The already allocatable DPair superclass contains odd-even D register
pair in addition to the even-odd pairs in the QPR register class. There
is no reason to constrain the set of D register pairs that can be used
for NEON values. Any NEON instructions that require a Q register will
automatically constrain the register class to QPR.

The allocation order for DPair begins with the QPR registers, so
register allocation is unlikely to change much.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199186 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2014-01-14 06:18:34 +00:00
parent 87a390ab47
commit aaf6cbdc7e
1 changed files with 1 additions and 1 deletions
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2
lib/Target/ARM/ARMISelLowering.cpp
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@ -156,7 +156,7 @@ void ARMTargetLowering::addDRTypeForNEON(MVT VT) {
}
void ARMTargetLowering::addQRTypeForNEON(MVT VT) {
addRegisterClass(VT, &ARM::QPRRegClass);
addRegisterClass(VT, &ARM::DPairRegClass);
addTypeForNEON(VT, MVT::v2f64, MVT::v4i32);
}