[X86] Remove DecodeVPERMVMask and DecodeVPERMV3Mask

This patch removes the variants of DecodeVPERMVMask and
DecodeVPERMV3Mask that take "const Constant *C" as they are not used
anymore.

They were introduced on Sep 8, 2015 in commit
e88038f.

The last use of DecodeVPERMVMask(const Constant *C, ...)  was removed
on Feb 7, 2016 in commit 73fc26b.

The last use of DecodeVPERMV3Mask(const Constant *C, ...) was removed
on May 28, 2018 in commit dcfcfdb.

Differential Revision: https://reviews.llvm.org/D91926

Author: kazutakahirata

llvm/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp

@@ -293,55 +293,4 @@ void DecodeVPPERMMask(const Constant *C, unsigned Width,
   }
 }
 
-void DecodeVPERMVMask(const Constant *C, unsigned ElSize, unsigned Width,
-                      SmallVectorImpl<int> &ShuffleMask) {
-  assert((Width == 128 || Width == 256 || Width == 512) &&
-         C->getType()->getPrimitiveSizeInBits() >= Width &&
-         "Unexpected vector size.");
-  assert((ElSize == 8 || ElSize == 16 || ElSize == 32 || ElSize == 64) &&
-         "Unexpected vector element size.");
-
-  // The shuffle mask requires elements the same size as the target.
-  APInt UndefElts;
-  SmallVector<uint64_t, 64> RawMask;
-  if (!extractConstantMask(C, ElSize, UndefElts, RawMask))
-    return;
-
-  unsigned NumElts = Width / ElSize;
-
-  for (unsigned i = 0; i != NumElts; ++i) {
-    if (UndefElts[i]) {
-      ShuffleMask.push_back(SM_SentinelUndef);
-      continue;
-    }
-    int Index = RawMask[i] & (NumElts - 1);
-    ShuffleMask.push_back(Index);
-  }
-}
-
-void DecodeVPERMV3Mask(const Constant *C, unsigned ElSize, unsigned Width,
-                       SmallVectorImpl<int> &ShuffleMask) {
-  assert((Width == 128 || Width == 256 || Width == 512) &&
-         C->getType()->getPrimitiveSizeInBits() >= Width &&
-         "Unexpected vector size.");
-  assert((ElSize == 8 || ElSize == 16 || ElSize == 32 || ElSize == 64) &&
-         "Unexpected vector element size.");
-
-  // The shuffle mask requires elements the same size as the target.
-  APInt UndefElts;
-  SmallVector<uint64_t, 64> RawMask;
-  if (!extractConstantMask(C, ElSize, UndefElts, RawMask))
-    return;
-
-  unsigned NumElts = Width / ElSize;
-
-  for (unsigned i = 0; i != NumElts; ++i) {
-    if (UndefElts[i]) {
-      ShuffleMask.push_back(SM_SentinelUndef);
-      continue;
-    }
-    int Index = RawMask[i] & (NumElts*2 - 1);
-    ShuffleMask.push_back(Index);
-  }
-}
 } // namespace llvm

llvm/lib/Target/X86/X86ShuffleDecodeConstantPool.h

@@ -38,14 +38,6 @@ void DecodeVPERMIL2PMask(const Constant *C, unsigned M2Z, unsigned ElSize,
 void DecodeVPPERMMask(const Constant *C, unsigned Width,
                       SmallVectorImpl<int> &ShuffleMask);
 
-/// Decode a VPERM W/D/Q/PS/PD mask from an IR-level vector constant.
-void DecodeVPERMVMask(const Constant *C, unsigned ElSize, unsigned Width,
-                      SmallVectorImpl<int> &ShuffleMask);
-
-/// Decode a VPERMT2 W/D/Q/PS/PD mask from an IR-level vector constant.
-void DecodeVPERMV3Mask(const Constant *C, unsigned ElSize, unsigned Width,
-                       SmallVectorImpl<int> &ShuffleMask);
-
 } // llvm namespace
 
 #endif