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Pull in r199186 from upstream llvm trunk (by Jakob Stoklund Olesen):
Switch the NEON register class from QPR to DPair.
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.
Introduced here: http://svnweb.freebsd.org/changeset/base/262261
Index: lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- lib/Target/ARM/ARMISelLowering.cpp
+++ lib/Target/ARM/ARMISelLowering.cpp
@@ -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);
}
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