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Move NEON "modified immediate" encode/decode into ARMAddressingModes.h to

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avoid replicated code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108227 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-07-13 04:44:34 +00:00
parent 37a746bc85
commit 6dce00ced4
4 changed files with 84 additions and 77 deletions
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lib/Target/ARM/ARMISelLowering.cpp
+16 -19
View File
@@ -2851,13 +2851,11 @@ static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) {
/// isNEONModifiedImm - Check if the specified splat value corresponds to a
/// valid vector constant for a NEON instruction with a "modified immediate"
/// operand (e.g., VMOV). If so, return either the constant being
/// splatted or the encoded value, depending on the DoEncode parameter. The
/// format of the encoded value is: bit12=Op, bits11-8=Cmode,
/// bits7-0=Immediate.
/// splatted or the encoded value, depending on the DoEncode parameter.
static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
unsigned SplatBitSize, SelectionDAG &DAG,
bool isVMOV, bool DoEncode) {
unsigned Op, Cmode, Imm;
unsigned OpCmode, Imm;
EVT VT;
// SplatBitSize is set to the smallest size that splats the vector, so a
@@ -2868,12 +2866,11 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
if (SplatBits == 0)
SplatBitSize = 32;
Op = 0;
switch (SplatBitSize) {
case 8:
// Any 1-byte value is OK. Op=0, Cmode=1110.
assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big");
Cmode = 0xe;
OpCmode = 0xe;
Imm = SplatBits;
VT = MVT::i8;
break;
@@ -2883,13 +2880,13 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
VT = MVT::i16;
if ((SplatBits & ~0xff) == 0) {
// Value = 0x00nn: Op=x, Cmode=100x.
Cmode = 0x8;
OpCmode = 0x8;
Imm = SplatBits;
break;
}
if ((SplatBits & ~0xff00) == 0) {
// Value = 0xnn00: Op=x, Cmode=101x.
Cmode = 0xa;
OpCmode = 0xa;
Imm = SplatBits >> 8;
break;
}
@@ -2903,25 +2900,25 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
VT = MVT::i32;
if ((SplatBits & ~0xff) == 0) {
// Value = 0x000000nn: Op=x, Cmode=000x.
Cmode = 0;
OpCmode = 0;
Imm = SplatBits;
break;
}
if ((SplatBits & ~0xff00) == 0) {
// Value = 0x0000nn00: Op=x, Cmode=001x.
Cmode = 0x2;
OpCmode = 0x2;
Imm = SplatBits >> 8;
break;
}
if ((SplatBits & ~0xff0000) == 0) {
// Value = 0x00nn0000: Op=x, Cmode=010x.
Cmode = 0x4;
OpCmode = 0x4;
Imm = SplatBits >> 16;
break;
}
if ((SplatBits & ~0xff000000) == 0) {
// Value = 0xnn000000: Op=x, Cmode=011x.
Cmode = 0x6;
OpCmode = 0x6;
Imm = SplatBits >> 24;
break;
}
@@ -2929,7 +2926,7 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
if ((SplatBits & ~0xffff) == 0 &&
((SplatBits | SplatUndef) & 0xff) == 0xff) {
// Value = 0x0000nnff: Op=x, Cmode=1100.
Cmode = 0xc;
OpCmode = 0xc;
Imm = SplatBits >> 8;
SplatBits |= 0xff;
break;
@@ -2938,7 +2935,7 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
if ((SplatBits & ~0xffffff) == 0 &&
((SplatBits | SplatUndef) & 0xffff) == 0xffff) {
// Value = 0x00nnffff: Op=x, Cmode=1101.
Cmode = 0xd;
OpCmode = 0xd;
Imm = SplatBits >> 16;
SplatBits |= 0xffff;
break;
@@ -2970,8 +2967,7 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
ImmMask <<= 1;
}
// Op=1, Cmode=1110.
Op = 1;
Cmode = 0xe;
OpCmode = 0x1e;
SplatBits = Val;
VT = MVT::i64;
break;
@@ -2982,12 +2978,13 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
return SDValue();
}
if (DoEncode)
return DAG.getTargetConstant((Op << 12) | (Cmode << 8) | Imm, MVT::i32);
if (DoEncode) {
unsigned EncodedVal = ARM_AM::createNEONModImm(OpCmode, Imm);
return DAG.getTargetConstant(EncodedVal, MVT::i32);
}
return DAG.getTargetConstant(SplatBits, VT);
}
/// getNEONModImm - If this is a valid vector constant for a NEON instruction
/// with a "modified immediate" operand (e.g., VMOV) of the specified element
/// size, return the encoded value for that immediate. The ByteSize field