maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[X86] Use getUnpackl/getUnpackh instead of hardcoding a shuffle mask. 

llvm-svn: 347127
This commit is contained in:
Craig Topper 2018-11-17 02:18:12 +00:00
parent 7570932977
commit b05ea28f1f
1 changed files with 5 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -23369,10 +23369,9 @@ static SDValue LowerMUL(SDValue Op, const X86Subtarget &Subtarget,
// We're going to mask off the low byte of each result element of the
// pmullw, so it doesn't matter what's in the high byte of each 16-bit
// element.
const int LoShufMask[] = {0, -1, 1, -1, 2, -1, 3, -1,
4, -1, 5, -1, 6, -1, 7, -1};
SDValue ALo = DAG.getVectorShuffle(VT, dl, A, A, LoShufMask);
SDValue BLo = DAG.getVectorShuffle(VT, dl, B, B, LoShufMask);
SDValue Undef = DAG.getUNDEF(VT);
SDValue ALo = getUnpackl(DAG, dl, VT, A, Undef);
SDValue BLo = getUnpackl(DAG, dl, VT, B, Undef);
ALo = DAG.getBitcast(ExVT, ALo);
BLo = DAG.getBitcast(ExVT, BLo);
@ -23380,10 +23379,8 @@ static SDValue LowerMUL(SDValue Op, const X86Subtarget &Subtarget,
// We're going to mask off the low byte of each result element of the
// pmullw, so it doesn't matter what's in the high byte of each 16-bit
// element.
const int HiShufMask[] = { 8, -1, 9, -1, 10, -1, 11, -1,
12, -1, 13, -1, 14, -1, 15, -1};
SDValue AHi = DAG.getVectorShuffle(VT, dl, A, A, HiShufMask);
SDValue BHi = DAG.getVectorShuffle(VT, dl, B, B, HiShufMask);
SDValue AHi = getUnpackh(DAG, dl, VT, A, Undef);
SDValue BHi = getUnpackh(DAG, dl, VT, B, Undef);
AHi = DAG.getBitcast(ExVT, AHi);
BHi = DAG.getBitcast(ExVT, BHi);