diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86SelectionDAGInfo.cpp | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/lib/Target/X86/X86SelectionDAGInfo.cpp b/lib/Target/X86/X86SelectionDAGInfo.cpp index c59d4074c7..0c5a0acd9c 100644 --- a/lib/Target/X86/X86SelectionDAGInfo.cpp +++ b/lib/Target/X86/X86SelectionDAGInfo.cpp @@ -187,19 +187,29 @@ X86SelectionDAGInfo::EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl, if (!AlwaysInline && SizeVal > Subtarget->getMaxInlineSizeThreshold()) return SDValue(); - /// If not DWORD aligned, call the library. - if ((Align & 3) != 0) + /// If not DWORD aligned, it is more efficient to call the library. However + /// if calling the library is not allowed (AlwaysInline), then soldier on as + /// the code generated here is better than the long load-store sequence we + /// would otherwise get. + if (!AlwaysInline && (Align & 3) != 0) return SDValue(); // If to a segment-relative address space, use the default lowering. if (DstPtrInfo.getAddrSpace() >= 256 || SrcPtrInfo.getAddrSpace() >= 256) return SDValue(); - - // DWORD aligned - EVT AVT = MVT::i32; - if (Subtarget->is64Bit() && ((Align & 0x7) == 0)) // QWORD aligned - AVT = MVT::i64; + + MVT AVT; + if (Align & 1) + AVT = MVT::i8; + else if (Align & 2) + AVT = MVT::i16; + else if (Align & 4) + // DWORD aligned + AVT = MVT::i32; + else + // QWORD aligned + AVT = Subtarget->is64Bit() ? MVT::i64 : MVT::i32; unsigned UBytes = AVT.getSizeInBits() / 8; unsigned CountVal = SizeVal / UBytes; |