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Ask legalize to promote all vector shuffles to be v16i8 instead of having to

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handle all 4 PPC vector types.   This simplifies the matching code and allows
us to eliminate a bunch of patterns.  This also adds cases we were missing,
such as CodeGen/PowerPC/vec_splat.ll:splat_h.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27400 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-04-04 17:25:31 +00:00
parent 4352cc9e21
commit 7ff7e67458
3 changed files with 68 additions and 45 deletions
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62
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -181,8 +181,9 @@ PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
setOperationAction(ISD::OR , (MVT::ValueType)VT, Legal);
setOperationAction(ISD::XOR , (MVT::ValueType)VT, Legal);
// We can custom expand all VECTOR_SHUFFLEs to VPERM.
setOperationAction(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, Custom);
// We promote all shuffles to v16i8.
setOperationAction(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, Promote);
AddPromotedToType(ISD::VECTOR_SHUFFLE, (MVT::ValueType)VT, MVT::v16i8);
setOperationAction(ISD::MUL , (MVT::ValueType)VT, Expand);
setOperationAction(ISD::SDIV, (MVT::ValueType)VT, Expand);
@ -196,6 +197,10 @@ PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
setOperationAction(ISD::SCALAR_TO_VECTOR, (MVT::ValueType)VT, Expand);
}
// We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
// with merges, splats, etc.
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
addRegisterClass(MVT::v4f32, PPC::VRRCRegisterClass);
addRegisterClass(MVT::v4i32, PPC::VRRCRegisterClass);
addRegisterClass(MVT::v8i16, PPC::VRRCRegisterClass);
@ -266,33 +271,47 @@ static bool isFloatingPointZero(SDOperand Op) {
/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element that is suitable for input to
/// VSPLTB/VSPLTH/VSPLTW.
bool PPC::isSplatShuffleMask(SDNode *N) {
assert(N->getOpcode() == ISD::BUILD_VECTOR);
// We can only splat 8-bit, 16-bit, and 32-bit quantities.
if (N->getNumOperands() != 4 && N->getNumOperands() != 8 &&
N->getNumOperands() != 16)
return false;
bool PPC::isSplatShuffleMask(SDNode *N, unsigned EltSize) {
assert(N->getOpcode() == ISD::BUILD_VECTOR &&
N->getNumOperands() == 16 &&
(EltSize == 1 || EltSize == 2 || EltSize == 4));
// This is a splat operation if each element of the permute is the same, and
// if the value doesn't reference the second vector.
unsigned ElementBase = 0;
SDOperand Elt = N->getOperand(0);
assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
for (unsigned i = 1, e = N->getNumOperands(); i != e; ++i) {
assert(isa<ConstantSDNode>(N->getOperand(i)) &&
"Invalid VECTOR_SHUFFLE mask!");
if (N->getOperand(i) != Elt) return false;
if (ConstantSDNode *EltV = dyn_cast<ConstantSDNode>(Elt))
ElementBase = EltV->getValue();
else
return false; // FIXME: Handle UNDEF elements too!
if (cast<ConstantSDNode>(Elt)->getValue() >= 16)
return false;
// Check that they are consequtive.
for (unsigned i = 1; i != EltSize; ++i) {
if (!isa<ConstantSDNode>(N->getOperand(i)) ||
cast<ConstantSDNode>(N->getOperand(i))->getValue() != i+ElementBase)
return false;
}
// Make sure it is a splat of the first vector operand.
return cast<ConstantSDNode>(Elt)->getValue() < N->getNumOperands();
assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
assert(isa<ConstantSDNode>(N->getOperand(i)) &&
"Invalid VECTOR_SHUFFLE mask!");
for (unsigned j = 0; j != EltSize; ++j)
if (N->getOperand(i+j) != N->getOperand(j))
return false;
}
return true;
}
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned PPC::getVSPLTImmediate(SDNode *N) {
assert(isSplatShuffleMask(N));
return cast<ConstantSDNode>(N->getOperand(0))->getValue();
unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
assert(isSplatShuffleMask(N, EltSize));
return cast<ConstantSDNode>(N->getOperand(0))->getValue() / EltSize;
}
/// isVecSplatImm - Return true if this is a build_vector of constants which
@ -734,7 +753,10 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
// Cases that are handled by instructions that take permute immediates
// (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
// selected by the instruction selector.
if (PPC::isSplatShuffleMask(PermMask.Val) && V2.getOpcode() == ISD::UNDEF)
if (V2.getOpcode() == ISD::UNDEF &&
(PPC::isSplatShuffleMask(PermMask.Val, 1) ||
PPC::isSplatShuffleMask(PermMask.Val, 2) ||
PPC::isSplatShuffleMask(PermMask.Val, 4)))
break;
// TODO: Handle more cases, and also handle cases that are cheaper to do as

4
lib/Target/PowerPC/PPCISelLowering.h
View File

@ -105,11 +105,11 @@ namespace llvm {
/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element that is suitable for input to
/// VSPLTB/VSPLTH/VSPLTW.
bool isSplatShuffleMask(SDNode *N);
bool isSplatShuffleMask(SDNode *N, unsigned EltSize);
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned getVSPLTImmediate(SDNode *N);
unsigned getVSPLTImmediate(SDNode *N, unsigned EltSize);
/// isVecSplatImm - Return true if this is a build_vector of constants which
/// can be formed by using a vspltis[bhw] instruction. The ByteSize field

53
lib/Target/PowerPC/PPCInstrAltivec.td
View File

@ -15,14 +15,25 @@
// Altivec transformation functions and pattern fragments.
//
// VSPLT_get_imm xform function: convert vector_shuffle mask to VSPLT* imm.
def VSPLT_get_imm : SDNodeXForm<build_vector, [{
return getI32Imm(PPC::getVSPLTImmediate(N));
// VSPLT*_get_imm xform function: convert vector_shuffle mask to VSPLT* imm.
def VSPLTB_get_imm : SDNodeXForm<build_vector, [{
return getI32Imm(PPC::getVSPLTImmediate(N, 1));
}]>;
def VSPLT_shuffle_mask : PatLeaf<(build_vector), [{
return PPC::isSplatShuffleMask(N);
}], VSPLT_get_imm>;
def VSPLTB_shuffle_mask : PatLeaf<(build_vector), [{
return PPC::isSplatShuffleMask(N, 1);
}], VSPLTB_get_imm>;
def VSPLTH_get_imm : SDNodeXForm<build_vector, [{
return getI32Imm(PPC::getVSPLTImmediate(N, 2));
}]>;
def VSPLTH_shuffle_mask : PatLeaf<(build_vector), [{
return PPC::isSplatShuffleMask(N, 2);
}], VSPLTH_get_imm>;
def VSPLTW_get_imm : SDNodeXForm<build_vector, [{
return getI32Imm(PPC::getVSPLTImmediate(N, 4));
}]>;
def VSPLTW_shuffle_mask : PatLeaf<(build_vector), [{
return PPC::isSplatShuffleMask(N, 4);
}], VSPLTW_get_imm>;
// VSPLTISB_get_imm xform function: convert build_vector to VSPLTISB imm.
@ -55,11 +66,6 @@ def vecspltisw : PatLeaf<(build_vector), [{
return PPC::isVecSplatImm(N, 4);
}], VSPLTISW_get_imm>;
class isVDOT { // vector dot instruction.
list<Register> Defs = [CR6];
bit RC = 1;
}
//===----------------------------------------------------------------------===//
// Helpers for defining instructions that directly correspond to intrinsics.
@ -294,15 +300,15 @@ def VSLW : VX1_Int< 388, "vslw", int_ppc_altivec_vslw>;
def VSPLTB : VXForm_1<524, (ops VRRC:$vD, u5imm:$UIMM, VRRC:$vB),
"vspltb $vD, $vB, $UIMM", VecPerm,
[(set VRRC:$vD, (vector_shuffle (v16i8 VRRC:$vB), (undef),
VSPLT_shuffle_mask:$UIMM))]>;
VSPLTB_shuffle_mask:$UIMM))]>;
def VSPLTH : VXForm_1<588, (ops VRRC:$vD, u5imm:$UIMM, VRRC:$vB),
"vsplth $vD, $vB, $UIMM", VecPerm,
[(set VRRC:$vD, (vector_shuffle (v8i16 VRRC:$vB), (undef),
VSPLT_shuffle_mask:$UIMM))]>;
[(set VRRC:$vD, (vector_shuffle (v16i8 VRRC:$vB), (undef),
VSPLTH_shuffle_mask:$UIMM))]>;
def VSPLTW : VXForm_1<652, (ops VRRC:$vD, u5imm:$UIMM, VRRC:$vB),
"vspltw $vD, $vB, $UIMM", VecPerm,
[(set VRRC:$vD, (vector_shuffle (v4f32 VRRC:$vB), (undef),
VSPLT_shuffle_mask:$UIMM))]>;
[(set VRRC:$vD, (vector_shuffle (v16i8 VRRC:$vB), (undef),
VSPLTW_shuffle_mask:$UIMM))]>;
def VSR : VX1_Int< 708, "vsr" , int_ppc_altivec_vsr>;
def VSRO : VX1_Int<1100, "vsro" , int_ppc_altivec_vsro>;
@ -355,7 +361,10 @@ class VCMP<bits<10> xo, string asmstr, ValueType Ty>
[(set VRRC:$vD, (Ty (PPCvcmp VRRC:$vA, VRRC:$vB, xo)))]>;
class VCMPo<bits<10> xo, string asmstr, ValueType Ty>
: VXRForm_1<xo, (ops VRRC:$vD, VRRC:$vA, VRRC:$vB), asmstr, VecFPCompare,
[(set VRRC:$vD, (Ty (PPCvcmp_o VRRC:$vA, VRRC:$vB, xo)))]>,isVDOT;
[(set VRRC:$vD, (Ty (PPCvcmp_o VRRC:$vA, VRRC:$vB, xo)))]> {
let Defs = [CR6];
let RC = 1;
}
// f32 element comparisons.0
def VCMPBFP : VCMP <966, "vcmpbfp $vD, $vA, $vB" , v4f32>;
@ -487,14 +496,6 @@ def : Pat<(int_ppc_altivec_vmaddfp VRRC:$A, VRRC:$B, VRRC:$C),
(VMADDFP VRRC:$A, VRRC:$B, VRRC:$C)>;
def : Pat<(int_ppc_altivec_vnmsubfp VRRC:$A, VRRC:$B, VRRC:$C),
(VNMSUBFP VRRC:$A, VRRC:$B, VRRC:$C)>;
def : Pat<(vector_shuffle (v4i32 VRRC:$vB), (undef), VSPLT_shuffle_mask:$UIMM),
(v4i32 (VSPLTW VSPLT_shuffle_mask:$UIMM, VRRC:$vB))>;
def : Pat<(PPCvperm (v4i32 VRRC:$vA), VRRC:$vB, VRRC:$vC),
(v4i32 (VPERM VRRC:$vA, VRRC:$vB, VRRC:$vC))>;
def : Pat<(PPCvperm (v4f32 VRRC:$vA), VRRC:$vB, VRRC:$vC),
(v4f32 (VPERM VRRC:$vA, VRRC:$vB, VRRC:$vC))>;
def : Pat<(PPCvperm (v8i16 VRRC:$vA), VRRC:$vB, VRRC:$vC),
(v8i16 (VPERM VRRC:$vA, VRRC:$vB, VRRC:$vC))>;
def : Pat<(PPCvperm (v16i8 VRRC:$vA), VRRC:$vB, VRRC:$vC),
(v16i8 (VPERM VRRC:$vA, VRRC:$vB, VRRC:$vC))>;