================
@@ -2790,6 +2790,34 @@ static bool interp__builtin_blend(InterpState &S,
CodePtr OpPC,
return true;
}
+static bool interp__builtin_ia32_pshufb(InterpState &S, CodePtr OpPC,
+ const CallExpr *Call) {
+ assert(Call->getNumArgs() == 2 && "masked forms handled via select*");
+ const Pointer &Control = S.Stk.pop<Pointer>();
+ const Pointer &Src = S.Stk.pop<Pointer>();
+ const Pointer &Dst = S.Stk.peek<Pointer>();
+
+ unsigned NumElems = Dst.getNumElems();
+ assert(NumElems == Control.getNumElems());
+ assert(NumElems == Dst.getNumElems());
+
+ for (unsigned Idx = 0; Idx != NumElems; ++Idx) {
+ uint8_t Ctlb = static_cast<uint8_t>(Control.elem<int8_t>(Idx));
+
+ if (Ctlb & 0x80) {
+ Dst.elem<int8_t>(Idx) = 0;
+ } else {
+ unsigned LaneBase = (Idx / 16) * 16;
----------------
shafik wrote:
Isn't this just a right shift and a left shift? That would seem more readable
code, intent wise.
Also 16 is a magic number, can we name it.
Same applies in the code below.
https://github.com/llvm/llvm-project/pull/163148
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