================
@@ -4718,6 +4718,30 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC,
const CallExpr *Call,
return APInt(8, 0);
});
+ case X86::BI__builtin_ia32_palignr128:
+ case X86::BI__builtin_ia32_palignr256:
+ case X86::BI__builtin_ia32_palignr512:
+ return interp__builtin_ia32_shuffle_generic(
+ S, OpPC, Call, [](unsigned DstIdx, unsigned Shift) {
+ // Default to -1 → zero-fill this destination element
+ unsigned VecIdx = 1;
+ int ElemIdx = -1;
+
+ int Lane = DstIdx / 16;
+ int Offset = DstIdx % 16;
+
+ // Elements come from VecB first, then VecA after the shift boundary
+ unsigned ShiftedIdx = Offset + Shift;
+ if (ShiftedIdx < 16) { // from VecB
+ ElemIdx = ShiftedIdx + Lane * 16;
----------------
RKSimon wrote:
```suggestion
ElemIdx = ShiftedIdx + (Lane * 16);
```
https://github.com/llvm/llvm-project/pull/162005
_______________________________________________
cfe-commits mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
