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Custom lower bit_convert i64 -> f64 into FMDRR. This is now happening with legalizetypes. 

llvm-svn: 58714
This commit is contained in:
Evan Cheng 2008-11-04 19:57:48 +00:00
parent 40346506f1
commit 297b32a367
2 changed files with 41 additions and 9 deletions
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21
llvm/lib/Target/ARM/ARMISelLowering.cpp
View File

@ -214,7 +214,7 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb())
// Turn f64->i64 into FMRRD iff target supports vfp2.
// Turn f64->i64 into FMRRD, i64 -> f64 to FMDRR iff target supports vfp2.
setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
// We want to custom lower some of our intrinsics.
@ -1349,13 +1349,19 @@ ARMTargetLowering::EmitTargetCodeForMemcpy(SelectionDAG &DAG,
}
static SDNode *ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
// Turn f64->i64 into FMRRD.
assert(N->getValueType(0) == MVT::i64 &&
N->getOperand(0).getValueType() == MVT::f64);
SDValue Op = N->getOperand(0);
if (N->getValueType(0) == MVT::f64) {
// Turn i64->f64 into FMDRR.
SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(0, MVT::i32));
SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(1, MVT::i32));
return DAG.getNode(ARMISD::FMDRR, MVT::f64, Lo, Hi).getNode();
}
// Turn f64->i64 into FMRRD.
SDValue Cvt = DAG.getNode(ARMISD::FMRRD, DAG.getVTList(MVT::i32, MVT::i32),
&Op, 1);
&Op, 1);
// Merge the pieces into a single i64 value.
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Cvt, Cvt.getValue(1)).getNode();
@ -1417,9 +1423,6 @@ SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
case ISD::FRAMEADDR: break;
case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
// FIXME: Remove these when LegalizeDAGTypes lands.
case ISD::BIT_CONVERT: return SDValue(ExpandBIT_CONVERT(Op.getNode(), DAG), 0);
case ISD::SRL:
case ISD::SRA: return SDValue(ExpandSRx(Op.getNode(), DAG,Subtarget),0);

29
llvm/test/CodeGen/ARM/fixunsdfdi.ll Normal file
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@ -0,0 +1,29 @@
; RUN: llvm-as < %s | llc -march=arm -mattr=+vfp2
; RUN: llvm-as < %s | llc -march=arm -mattr=vfp2 | not grep fstd
define hidden i64 @__fixunsdfdi(double %x) nounwind readnone {
entry:
%x14 = bitcast double %x to i64 ; <i64> [#uses=1]
br i1 true, label %bb3, label %bb10
bb3: ; preds = %entry
br i1 true, label %bb5, label %bb7
bb5: ; preds = %bb3
%u.in.mask = and i64 %x14, -4294967296 ; <i64> [#uses=1]
%.ins = or i64 0, %u.in.mask ; <i64> [#uses=1]
%0 = bitcast i64 %.ins to double ; <double> [#uses=1]
%1 = sub double %x, %0 ; <double> [#uses=1]
%2 = fptosi double %1 to i32 ; <i32> [#uses=1]
%3 = add i32 %2, 0 ; <i32> [#uses=1]
%4 = zext i32 %3 to i64 ; <i64> [#uses=1]
%5 = shl i64 %4, 32 ; <i64> [#uses=1]
%6 = or i64 %5, 0 ; <i64> [#uses=1]
ret i64 %6
bb7: ; preds = %bb3
ret i64 0
bb10: ; preds = %entry
ret i64 0
}