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-rw-r--r--contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp217
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diff --git a/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp
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+++ b/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp
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+//===-- X86ShuffleDecode.cpp - X86 shuffle decode logic -------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Define several functions to decode x86 specific shuffle semantics into a
+// generic vector mask.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86ShuffleDecode.h"
+
+//===----------------------------------------------------------------------===//
+// Vector Mask Decoding
+//===----------------------------------------------------------------------===//
+
+namespace llvm {
+
+void DecodeINSERTPSMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+ // Defaults the copying the dest value.
+ ShuffleMask.push_back(0);
+ ShuffleMask.push_back(1);
+ ShuffleMask.push_back(2);
+ ShuffleMask.push_back(3);
+
+ // Decode the immediate.
+ unsigned ZMask = Imm & 15;
+ unsigned CountD = (Imm >> 4) & 3;
+ unsigned CountS = (Imm >> 6) & 3;
+
+ // CountS selects which input element to use.
+ unsigned InVal = 4+CountS;
+ // CountD specifies which element of destination to update.
+ ShuffleMask[CountD] = InVal;
+ // ZMask zaps values, potentially overriding the CountD elt.
+ if (ZMask & 1) ShuffleMask[0] = SM_SentinelZero;
+ if (ZMask & 2) ShuffleMask[1] = SM_SentinelZero;
+ if (ZMask & 4) ShuffleMask[2] = SM_SentinelZero;
+ if (ZMask & 8) ShuffleMask[3] = SM_SentinelZero;
+}
+
+// <3,1> or <6,7,2,3>
+void DecodeMOVHLPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned i = NElts/2; i != NElts; ++i)
+ ShuffleMask.push_back(NElts+i);
+
+ for (unsigned i = NElts/2; i != NElts; ++i)
+ ShuffleMask.push_back(i);
+}
+
+// <0,2> or <0,1,4,5>
+void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned i = 0; i != NElts/2; ++i)
+ ShuffleMask.push_back(i);
+
+ for (unsigned i = 0; i != NElts/2; ++i)
+ ShuffleMask.push_back(NElts+i);
+}
+
+void DecodePALIGNRMask(MVT VT, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+ unsigned Offset = Imm * (VT.getVectorElementType().getSizeInBits() / 8);
+
+ unsigned NumLanes = VT.getSizeInBits() / 128;
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = 0; i != NumLaneElts; ++i) {
+ unsigned Base = i + Offset;
+ // if i+offset is out of this lane then we actually need the other source
+ if (Base >= NumLaneElts) Base += NumElts - NumLaneElts;
+ ShuffleMask.push_back(Base + l);
+ }
+ }
+}
+
+/// DecodePSHUFMask - This decodes the shuffle masks for pshufd, and vpermilp*.
+/// VT indicates the type of the vector allowing it to handle different
+/// datatypes and vector widths.
+void DecodePSHUFMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+
+ unsigned NumLanes = VT.getSizeInBits() / 128;
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ unsigned NewImm = Imm;
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = 0; i != NumLaneElts; ++i) {
+ ShuffleMask.push_back(NewImm % NumLaneElts + l);
+ NewImm /= NumLaneElts;
+ }
+ if (NumLaneElts == 4) NewImm = Imm; // reload imm
+ }
+}
+
+void DecodePSHUFHWMask(MVT VT, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+
+ for (unsigned l = 0; l != NumElts; l += 8) {
+ unsigned NewImm = Imm;
+ for (unsigned i = 0, e = 4; i != e; ++i) {
+ ShuffleMask.push_back(l + i);
+ }
+ for (unsigned i = 4, e = 8; i != e; ++i) {
+ ShuffleMask.push_back(l + 4 + (NewImm & 3));
+ NewImm >>= 2;
+ }
+ }
+}
+
+void DecodePSHUFLWMask(MVT VT, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+
+ for (unsigned l = 0; l != NumElts; l += 8) {
+ unsigned NewImm = Imm;
+ for (unsigned i = 0, e = 4; i != e; ++i) {
+ ShuffleMask.push_back(l + (NewImm & 3));
+ NewImm >>= 2;
+ }
+ for (unsigned i = 4, e = 8; i != e; ++i) {
+ ShuffleMask.push_back(l + i);
+ }
+ }
+}
+
+/// DecodeSHUFPMask - This decodes the shuffle masks for shufp*. VT indicates
+/// the type of the vector allowing it to handle different datatypes and vector
+/// widths.
+void DecodeSHUFPMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+
+ unsigned NumLanes = VT.getSizeInBits() / 128;
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ unsigned NewImm = Imm;
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ // each half of a lane comes from different source
+ for (unsigned s = 0; s != NumElts*2; s += NumElts) {
+ for (unsigned i = 0; i != NumLaneElts/2; ++i) {
+ ShuffleMask.push_back(NewImm % NumLaneElts + s + l);
+ NewImm /= NumLaneElts;
+ }
+ }
+ if (NumLaneElts == 4) NewImm = Imm; // reload imm
+ }
+}
+
+/// DecodeUNPCKHMask - This decodes the shuffle masks for unpckhps/unpckhpd
+/// and punpckh*. VT indicates the type of the vector allowing it to handle
+/// different datatypes and vector widths.
+void DecodeUNPCKHMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+
+ // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
+ // independently on 128-bit lanes.
+ unsigned NumLanes = VT.getSizeInBits() / 128;
+ if (NumLanes == 0 ) NumLanes = 1; // Handle MMX
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = l + NumLaneElts/2, e = l + NumLaneElts; i != e; ++i) {
+ ShuffleMask.push_back(i); // Reads from dest/src1
+ ShuffleMask.push_back(i+NumElts); // Reads from src/src2
+ }
+ }
+}
+
+/// DecodeUNPCKLMask - This decodes the shuffle masks for unpcklps/unpcklpd
+/// and punpckl*. VT indicates the type of the vector allowing it to handle
+/// different datatypes and vector widths.
+void DecodeUNPCKLMask(MVT VT, SmallVectorImpl<int> &ShuffleMask) {
+ unsigned NumElts = VT.getVectorNumElements();
+
+ // Handle 128 and 256-bit vector lengths. AVX defines UNPCK* to operate
+ // independently on 128-bit lanes.
+ unsigned NumLanes = VT.getSizeInBits() / 128;
+ if (NumLanes == 0 ) NumLanes = 1; // Handle MMX
+ unsigned NumLaneElts = NumElts / NumLanes;
+
+ for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+ for (unsigned i = l, e = l + NumLaneElts/2; i != e; ++i) {
+ ShuffleMask.push_back(i); // Reads from dest/src1
+ ShuffleMask.push_back(i+NumElts); // Reads from src/src2
+ }
+ }
+}
+
+void DecodeVPERM2X128Mask(MVT VT, unsigned Imm,
+ SmallVectorImpl<int> &ShuffleMask) {
+ if (Imm & 0x88)
+ return; // Not a shuffle
+
+ unsigned HalfSize = VT.getVectorNumElements()/2;
+
+ for (unsigned l = 0; l != 2; ++l) {
+ unsigned HalfBegin = ((Imm >> (l*4)) & 0x3) * HalfSize;
+ for (unsigned i = HalfBegin, e = HalfBegin+HalfSize; i != e; ++i)
+ ShuffleMask.push_back(i);
+ }
+}
+
+/// DecodeVPERMMask - this decodes the shuffle masks for VPERMQ/VPERMPD.
+/// No VT provided since it only works on 256-bit, 4 element vectors.
+void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+ for (unsigned i = 0; i != 4; ++i) {
+ ShuffleMask.push_back((Imm >> (2*i)) & 3);
+ }
+}
+
+} // llvm namespace
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