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Add support for getting & setting the FPSCR application register on ARM when VFP is enabled.

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Add support for using the FPSCR in conjunction with the vcvtr instruction, for controlling fp to int rounding.
Add support for the FLT_ROUNDS_ node now that the FPSCR is exposed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110152 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2010-08-03 21:31:55 +00:00
parent 6fc24467e9
commit d1fb583128
5 changed files with 53 additions and 20 deletions
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14
include/llvm/IntrinsicsARM.td
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@ -35,6 +35,20 @@ let TargetPrefix = "arm" in { // All intrinsics start with "llvm.arm.".
Intrinsic<[llvm_i32_ty], [llvm_i32_ty, llvm_i32_ty], [IntrNoMem]>;
}
//===----------------------------------------------------------------------===//
// VFP
let TargetPrefix = "arm" in { // All intrinsics start with "llvm.arm.".
def int_arm_get_fpscr : GCCBuiltin<"__builtin_arm_get_fpscr">,
Intrinsic<[llvm_i32_ty], [], [IntrNoMem]>;
def int_arm_set_fpscr : GCCBuiltin<"__builtin_arm_set_fpscr">,
Intrinsic<[], [llvm_i32_ty], [IntrWriteMem]>;
def int_arm_vcvtr : Intrinsic<[llvm_float_ty], [llvm_anyfloat_ty],
[IntrNoMem]>;
def int_arm_vcvtru : Intrinsic<[llvm_float_ty], [llvm_anyfloat_ty],
[IntrNoMem]>;
}
//===----------------------------------------------------------------------===//
// Advanced SIMD (NEON)

1
lib/Target/ARM/ARMBaseRegisterInfo.cpp
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@ -176,6 +176,7 @@ getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
Reserved.set(ARM::SP);
Reserved.set(ARM::PC);
Reserved.set(ARM::FPSCR);
if (STI.isTargetDarwin() || hasFP(MF))
Reserved.set(FramePtr);
// Some targets reserve R9.

23
lib/Target/ARM/ARMISelLowering.cpp
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@ -474,10 +474,12 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
}
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only())
if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
// Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR
// iff target supports vfp2.
setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
}
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
@ -2764,6 +2766,24 @@ SDValue ARMTargetLowering::LowerShiftLeftParts(SDValue Op,
return DAG.getMergeValues(Ops, 2, dl);
}
SDValue ARMTargetLowering::LowerFLT_ROUNDS_(SDValue Op,
SelectionDAG &DAG) const {
// The rounding mode is in bits 23:22 of the FPSCR.
// The ARM rounding mode value to FLT_ROUNDS mapping is 0->1, 1->2, 2->3, 3->0
// The formula we use to implement this is (((FPSCR + 1 << 22) >> 22) & 3)
// so that the shift + and get folded into a bitfield extract.
DebugLoc dl = Op.getDebugLoc();
SDValue FPSCR = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::i32,
DAG.getConstant(Intrinsic::arm_get_fpscr,
MVT::i32));
SDValue FltRounds = DAG.getNode(ISD::ADD, dl, MVT::i32, FPSCR,
DAG.getConstant(1U << 22, MVT::i32));
SDValue RMODE = DAG.getNode(ISD::SRL, dl, MVT::i32, FltRounds,
DAG.getConstant(22, MVT::i32));
return DAG.getNode(ISD::AND, dl, MVT::i32, RMODE,
DAG.getConstant(3, MVT::i32));
}
static SDValue LowerCTTZ(SDNode *N, SelectionDAG &DAG,
const ARMSubtarget *ST) {
EVT VT = N->getValueType(0);
@ -3705,6 +3725,7 @@ SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
}
return SDValue();
}

3
lib/Target/ARM/ARMISelLowering.h
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@ -82,7 +82,7 @@ namespace llvm {
MEMBARRIER, // Memory barrier
SYNCBARRIER, // Memory sync barrier
VCEQ, // Vector compare equal.
VCGE, // Vector compare greater than or equal.
VCGEU, // Vector compare unsigned greater than or equal.
@ -342,6 +342,7 @@ namespace llvm {
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,

32
lib/Target/ARM/ARMInstrVFP.td
View File

@ -420,34 +420,35 @@ def VTOUIZS : AVConv1In<0b11101, 0b11, 0b1100, 0b1010,
// And the Z bit '0' variants, i.e. use the rounding mode specified by FPSCR.
// For disassembly only.
let Uses = [FPSCR] in {
def VTOSIRD : AVConv1I<0b11101, 0b11, 0b1101, 0b1011,
(outs SPR:$dst), (ins DPR:$a),
IIC_fpCVTDI, "vcvtr", ".s32.f64\t$dst, $a",
[/* For disassembly only; pattern left blank */]> {
[(set SPR:$dst, (int_arm_vcvtr (f64 DPR:$a)))]> {
let Inst{7} = 0; // Z bit
}
def VTOSIRS : AVConv1In<0b11101, 0b11, 0b1101, 0b1010,
(outs SPR:$dst), (ins SPR:$a),
IIC_fpCVTSI, "vcvtr", ".s32.f32\t$dst, $a",
[/* For disassembly only; pattern left blank */]> {
[(set SPR:$dst, (int_arm_vcvtr SPR:$a))]> {
let Inst{7} = 0; // Z bit
}
def VTOUIRD : AVConv1I<0b11101, 0b11, 0b1100, 0b1011,
(outs SPR:$dst), (ins DPR:$a),
IIC_fpCVTDI, "vcvtr", ".u32.f64\t$dst, $a",
[/* For disassembly only; pattern left blank */]> {
[(set SPR:$dst, (int_arm_vcvtru (f64 DPR:$a)))]> {
let Inst{7} = 0; // Z bit
}
def VTOUIRS : AVConv1In<0b11101, 0b11, 0b1100, 0b1010,
(outs SPR:$dst), (ins SPR:$a),
IIC_fpCVTSI, "vcvtr", ".u32.f32\t$dst, $a",
[/* For disassembly only; pattern left blank */]> {
[(set SPR:$dst, (int_arm_vcvtru SPR:$a))]> {
let Inst{7} = 0; // Z bit
}
}
// Convert between floating-point and fixed-point
// Data type for fixed-point naming convention:
@ -654,32 +655,27 @@ def FMSTAT : VFPAI<(outs), (ins), VFPMiscFrm, IIC_fpSTAT, "vmrs",
}
// FPSCR <-> GPR (for disassembly only)
let neverHasSideEffects = 1 in {
let Uses = [FPSCR] in {
def VMRS : VFPAI<(outs GPR:$dst), (ins), VFPMiscFrm, IIC_fpSTAT, "vmrs",
"\t$dst, fpscr",
[/* For disassembly only; pattern left blank */]> {
let hasSideEffects = 1, Uses = [FPSCR] in
def VMRS : VFPAI<(outs GPR:$dst), (ins), VFPMiscFrm, IIC_fpSTAT,
"vmrs", "\t$dst, fpscr",
[(set GPR:$dst, (int_arm_get_fpscr))]> {
let Inst{27-20} = 0b11101111;
let Inst{19-16} = 0b0001;
let Inst{11-8} = 0b1010;
let Inst{7} = 0;
let Inst{4} = 1;
}
}
let Defs = [FPSCR] in {
def VMSR : VFPAI<(outs), (ins GPR:$src), VFPMiscFrm, IIC_fpSTAT, "vmsr",
"\tfpscr, $src",
[/* For disassembly only; pattern left blank */]> {
let Defs = [FPSCR] in
def VMSR : VFPAI<(outs), (ins GPR:$src), VFPMiscFrm, IIC_fpSTAT,
"vmsr", "\tfpscr, $src",
[(int_arm_set_fpscr GPR:$src)]> {
let Inst{27-20} = 0b11101110;
let Inst{19-16} = 0b0001;
let Inst{11-8} = 0b1010;
let Inst{7} = 0;
let Inst{4} = 1;
}
}
} // neverHasSideEffects
// Materialize FP immediates. VFP3 only.
let isReMaterializable = 1 in {