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Allow TargetLowering::getRegClassFor() to be called on illegal types. Also

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allow target to override it in order to map register classes to illegal
but synthesizable types. e.g. v4i64, v8i64 for ARM / NEON.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103854 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-05-15 02:18:07 +00:00
parent 7092c2bfcb
commit 06b666c705
4 changed files with 29 additions and 9 deletions
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20
lib/Target/ARM/ARMISelLowering.cpp
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@ -266,13 +266,6 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
addQRTypeForNEON(MVT::v4i32);
addQRTypeForNEON(MVT::v2i64);
// Map v4i64 to QQ registers but do not make the type legal for any
// operations. Similarly map v8i64 to QQQQ registers. v4i64 and v8i64 are
// only used for REG_SEQUENCE to load / store 4 to 8 consecutive
// D registers.
addRegisterClass(MVT::v4i64, ARM::QQPRRegisterClass);
addRegisterClass(MVT::v8i64, ARM::QQQQPRRegisterClass);
// v2f64 is legal so that QR subregs can be extracted as f64 elements, but
// neither Neon nor VFP support any arithmetic operations on it.
setOperationAction(ISD::FADD, MVT::v2f64, Expand);
@ -586,6 +579,19 @@ const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
}
}
/// getRegClassFor - Return the register class that should be used for the
/// specified value type.
TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
// Map v4i64 to QQ registers but do not make the type legal. Similarly map
// v8i64 to QQQQ registers. v4i64 and v8i64 are only used for REG_SEQUENCE to
// load / store 4 to 8 consecutive D registers.
if (VT == MVT::v4i64)
return ARM::QQPRRegisterClass;
else if (VT == MVT::v8i64)
return ARM::QQQQPRRegisterClass;
return TargetLowering::getRegClassFor(VT);
}
/// getFunctionAlignment - Return the Log2 alignment of this function.
unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const {
return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 0 : 1;