Revert the patches adding a popcount loop idiom recognition pass.

There are still bugs in this pass, as well as other issues that are
being worked on, but the bugs are crashers that occur pretty easily in
the wild. Test cases have been sent to the original commit's review
thread.

This reverts the commits:
  r169671: Fix a logic error.
  r169604: Move the popcnt tests to an X86 subdirectory.
  r168931: Initial commit adding the pass.

llvm-svn: 169683

1 files changed, 0 insertions, 11 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 84e5677d6c1..af772ed7a36 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -17679,17 +17679,6 @@ FindInConvertTable(const X86TypeConversionCostTblEntry *Tbl, unsigned len,
   return -1;
 }
 
-ScalarTargetTransformInfo::PopcntHwSupport
-X86ScalarTargetTransformImpl::getPopcntHwSupport(unsigned TyWidth) const {
-  assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
-  const X86Subtarget &ST = TLI->getTargetMachine().getSubtarget<X86Subtarget>();
-
-  // TODO: Currently the __builtin_popcount() implementation using SSE3
-  //   instructions is inefficient. Once the problem is fixed, we should
-  //   call ST.hasSSE3() instead of ST.hasSSE4().
-  return ST.hasSSE41() ? Fast : None;
-}
-
 unsigned
 X86VectorTargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
                                                      Type *Ty) const {