[X86] Pulled out helper to decode target shuffle element sentinel values to 'Zeroable' known undef/zero bits. NFCI.
Renamed 'resolveTargetShuffleAndZeroables' to 'resolveTargetShuffleFromZeroables' to match.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375348 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1c9ee5d..b498a12 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -6808,9 +6808,9 @@
}
// Replace target shuffle mask elements with known undef/zero sentinels.
-static void resolveTargetShuffleAndZeroables(SmallVectorImpl<int> &Mask,
- const APInt &KnownUndef,
- const APInt &KnownZero) {
+static void resolveTargetShuffleFromZeroables(SmallVectorImpl<int> &Mask,
+ const APInt &KnownUndef,
+ const APInt &KnownZero) {
unsigned NumElts = Mask.size();
assert(KnownUndef.getBitWidth() == NumElts &&
KnownZero.getBitWidth() == NumElts && "Shuffle mask size mismatch");
@@ -6823,6 +6823,22 @@
}
}
+// Extract target shuffle mask sentinel elements to known undef/zero bitmasks.
+static void resolveZeroablesFromTargetShuffle(const SmallVectorImpl<int> &Mask,
+ APInt &KnownUndef,
+ APInt &KnownZero) {
+ unsigned NumElts = Mask.size();
+ KnownUndef = KnownZero = APInt::getNullValue(NumElts);
+
+ for (unsigned i = 0; i != NumElts; ++i) {
+ int M = Mask[i];
+ if (SM_SentinelUndef == M)
+ KnownUndef.setBit(i);
+ if (SM_SentinelZero == M)
+ KnownZero.setBit(i);
+ }
+}
+
// Forward declaration (for getFauxShuffleMask recursive check).
// TODO: Use DemandedElts variant.
static bool getTargetShuffleInputs(SDValue Op, SmallVectorImpl<SDValue> &Inputs,
@@ -7273,19 +7289,12 @@
if (getTargetShuffleAndZeroables(Op, Mask, Inputs, KnownUndef, KnownZero)) {
if (ResolveKnownElts)
- resolveTargetShuffleAndZeroables(Mask, KnownUndef, KnownZero);
+ resolveTargetShuffleFromZeroables(Mask, KnownUndef, KnownZero);
return true;
}
if (getFauxShuffleMask(Op, DemandedElts, Mask, Inputs, DAG, Depth,
ResolveKnownElts)) {
- KnownUndef = KnownZero = APInt::getNullValue(Mask.size());
- for (int i = 0, e = Mask.size(); i != e; ++i) {
- int M = Mask[i];
- if (SM_SentinelUndef == M)
- KnownUndef.setBit(i);
- if (SM_SentinelZero == M)
- KnownZero.setBit(i);
- }
+ resolveZeroablesFromTargetShuffle(Mask, KnownUndef, KnownZero);
return true;
}
return false;
@@ -33047,7 +33056,7 @@
OpZero, DAG, Depth, false))
return SDValue();
- resolveTargetShuffleAndZeroables(OpMask, OpUndef, OpZero);
+ resolveTargetShuffleFromZeroables(OpMask, OpUndef, OpZero);
// Add the inputs to the Ops list, avoiding duplicates.
SmallVector<SDValue, 16> Ops(SrcOps.begin(), SrcOps.end());