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Simplify math a little bit.

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llvm-svn: 187781
This commit is contained in:
Craig Topper 2013-08-06 06:54:25 +00:00
parent 0eb9242c56
commit 70290dd386
1 changed files with 16 additions and 15 deletions
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31
lib/Target/X86/X86ISelLowering.cpp
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@ -17792,23 +17792,24 @@ static bool isHorizontalBinOp(SDValue &LHS, SDValue &RHS, bool IsCommutative) {
// LHS = VECTOR_SHUFFLE A, B, LMask
// RHS = VECTOR_SHUFFLE A, B, RMask
// Check that the masks correspond to performing a horizontal operation.
for (unsigned i = 0; i != NumElts; ++i) {
int LIdx = LMask[i], RIdx = RMask[i];
for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
for (unsigned i = 0; i != NumLaneElts; ++i) {
int LIdx = LMask[i+l], RIdx = RMask[i+l];
// Ignore any UNDEF components.
if (LIdx < 0 || RIdx < 0 ||
(!A.getNode() && (LIdx < (int)NumElts || RIdx < (int)NumElts)) ||
(!B.getNode() && (LIdx >= (int)NumElts || RIdx >= (int)NumElts)))
continue;
// Ignore any UNDEF components.
if (LIdx < 0 || RIdx < 0 ||
(!A.getNode() && (LIdx < (int)NumElts || RIdx < (int)NumElts)) ||
(!B.getNode() && (LIdx >= (int)NumElts || RIdx >= (int)NumElts)))
continue;
// Check that successive elements are being operated on. If not, this is
// not a horizontal operation.
unsigned Src = (i/HalfLaneElts) % 2; // each lane is split between srcs
unsigned LaneStart = (i/NumLaneElts) * NumLaneElts;
int Index = 2*(i%HalfLaneElts) + NumElts*Src + LaneStart;
if (!(LIdx == Index && RIdx == Index + 1) &&
!(IsCommutative && LIdx == Index + 1 && RIdx == Index))
return false;
// Check that successive elements are being operated on. If not, this is
// not a horizontal operation.
unsigned Src = (i/HalfLaneElts); // each lane is split between srcs
int Index = 2*(i%HalfLaneElts) + NumElts*Src + l;
if (!(LIdx == Index && RIdx == Index + 1) &&
!(IsCommutative && LIdx == Index + 1 && RIdx == Index))
return false;
}
}
LHS = A.getNode() ? A : B; // If A is 'UNDEF', use B for it.