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spirv: air array_to_slice

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This commit is contained in:
Robin Voetter
2023-09-17 23:18:06 +02:00
committed by Andrew Kelley
parent 66b1f6c163
commit 8d49b2ef4e
2 changed files with 26 additions and 7 deletions
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26
src/codegen/spirv.zig
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@@ -1681,6 +1681,8 @@ pub const DeclGen = struct {
.int_from_float => try self.airIntFromFloat(inst),
.not => try self.airNot(inst),
.array_to_slice => try self.airArrayToSlice(inst),
.slice_ptr => try self.airSliceField(inst, 0),
.slice_len => try self.airSliceField(inst, 1),
.slice_elem_ptr => try self.airSliceElemPtr(inst),
@@ -2427,6 +2429,30 @@ pub const DeclGen = struct {
return result_id;
}
fn airArrayToSlice(self: *DeclGen, inst: Air.Inst.Index) !?IdRef {
const mod = self.module;
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const array_ptr_ty = self.typeOf(ty_op.operand);
const array_ty = array_ptr_ty.childType(mod);
const elem_ty = array_ptr_ty.elemType2(mod); // use elemType() so that we get T for *[N]T.
const elem_ty_ref = try self.resolveType(elem_ty, .indirect);
const elem_ptr_ty_ref = try self.spv.ptrType(elem_ty_ref, spvStorageClass(array_ptr_ty.ptrAddressSpace(mod)));
const slice_ty = self.typeOfIndex(inst);
const slice_ty_ref = try self.resolveType(slice_ty, .direct);
const size_ty_ref = try self.sizeType();
const array_ptr_id = try self.resolve(ty_op.operand);
const len_id = try self.constInt(size_ty_ref, array_ty.arrayLen(mod));
if (!array_ty.hasRuntimeBitsIgnoreComptime(mod)) {
unreachable; // TODO
}
// Convert the pointer-to-array to a pointer to the first element.
const elem_ptr_id = try self.accessChain(elem_ptr_ty_ref, array_ptr_id, &.{0});
return try self.constructStruct(slice_ty_ref, &.{ elem_ptr_id, len_id });
}
fn airSliceField(self: *DeclGen, inst: Air.Inst.Index, field: u32) !?IdRef {
if (self.liveness.isUnused(inst)) return null;
const ty_op = self.air.instructions.items(.data)[inst].ty_op;