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Add an address space for the X86 SS segment.

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Patch by Michael LeMay (michael.lemay@intel.com)

Differential Revision: http://reviews.llvm.org/D17093

llvm-svn: 268431
This commit is contained in:
David L Kreitzer 2016-05-03 20:16:08 +00:00
parent 3c2b0f5e53
commit ed75c93233
2 changed files with 11 additions and 5 deletions
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6
docs/CodeGenerator.rst
View File

@ -2197,9 +2197,9 @@ prefix byte on an instruction causes the instruction's memory access to go to
the specified segment. LLVM address space 0 is the default address space, which
includes the stack, and any unqualified memory accesses in a program. Address
spaces 1-255 are currently reserved for user-defined code. The GS-segment is
represented by address space 256, while the FS-segment is represented by address
space 257. Other x86 segments have yet to be allocated address space
numbers.
represented by address space 256, the FS-segment is represented by address space
257, and the SS-segment is represented by address space 258. Other x86 segments
have yet to be allocated address space numbers.
While these address spaces may seem similar to TLS via the ``thread_local``
keyword, and often use the same underlying hardware, there are some fundamental

10
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -727,6 +727,8 @@ bool X86DAGToDAGISel::matchLoadInAddress(LoadSDNode *N, X86ISelAddressMode &AM){
case 257:
AM.Segment = CurDAG->getRegister(X86::FS, MVT::i16);
return false;
// Address space 258 is not handled here, because it is not used to
// address TLS areas.
}
return true;
@ -1424,11 +1426,13 @@ bool X86DAGToDAGISel::selectVectorAddr(SDNode *Parent, SDValue N, SDValue &Base,
return false;
X86ISelAddressMode AM;
unsigned AddrSpace = Mgs->getPointerInfo().getAddrSpace();
// AddrSpace 256 -> GS, 257 -> FS.
// AddrSpace 256 -> GS, 257 -> FS, 258 -> SS.
if (AddrSpace == 256)
AM.Segment = CurDAG->getRegister(X86::GS, MVT::i16);
if (AddrSpace == 257)
AM.Segment = CurDAG->getRegister(X86::FS, MVT::i16);
if (AddrSpace == 258)
AM.Segment = CurDAG->getRegister(X86::SS, MVT::i16);
SDLoc DL(N);
Base = Mgs->getBasePtr();
@ -1473,11 +1477,13 @@ bool X86DAGToDAGISel::selectAddr(SDNode *Parent, SDValue N, SDValue &Base,
Parent->getOpcode() != X86ISD::EH_SJLJ_LONGJMP) { // longjmp
unsigned AddrSpace =
cast<MemSDNode>(Parent)->getPointerInfo().getAddrSpace();
// AddrSpace 256 -> GS, 257 -> FS.
// AddrSpace 256 -> GS, 257 -> FS, 258 -> SS.
if (AddrSpace == 256)
AM.Segment = CurDAG->getRegister(X86::GS, MVT::i16);
if (AddrSpace == 257)
AM.Segment = CurDAG->getRegister(X86::FS, MVT::i16);
if (AddrSpace == 258)
AM.Segment = CurDAG->getRegister(X86::SS, MVT::i16);
}
if (matchAddress(N, AM))