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spirv: left shift

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Implements the AIR left_shift operation for the SPIR-V backend.
This commit is contained in:
Robin Voetter 2022-11-27 15:04:16 +01:00
parent ea97966c9e
commit 205d928b24
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1 changed files with 27 additions and 0 deletions
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27
src/codegen/spirv.zig
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@ -850,6 +850,8 @@ pub const DeclGen = struct {
.bool_and => try self.airBinOpSimple(inst, .OpLogicalAnd),
.bool_or => try self.airBinOpSimple(inst, .OpLogicalOr),
.shl => try self.airShift(inst, .OpShiftLeftLogical),
.bitcast => try self.airBitcast(inst),
.intcast => try self.airIntcast(inst),
.not => try self.airNot(inst),
@ -928,6 +930,31 @@ pub const DeclGen = struct {
return result_id.toRef();
}
fn airShift(self: *DeclGen, inst: Air.Inst.Index, comptime opcode: Opcode) !?IdRef {
if (self.liveness.isUnused(inst)) return null;
const bin_op = self.air.instructions.items(.data)[inst].bin_op;
const lhs_id = try self.resolve(bin_op.lhs);
const rhs_id = try self.resolve(bin_op.rhs);
const result_type_id = try self.resolveTypeId(self.air.typeOfIndex(inst));
// the shift and the base must be the same type in SPIR-V, but in Zig the shift is a smaller int.
const shift_id = self.spv.allocId();
try self.func.body.emit(self.spv.gpa, .OpUConvert, .{
.id_result_type = result_type_id,
.id_result = shift_id,
.unsigned_value = rhs_id,
});
const result_id = self.spv.allocId();
try self.func.body.emit(self.spv.gpa, opcode, .{
.id_result_type = result_type_id,
.id_result = result_id,
.base = lhs_id,
.shift = shift_id.toRef(),
});
return result_id.toRef();
}
fn maskStrangeInt(self: *DeclGen, ty_id: IdResultType, int_id: IdRef, bits: u16) !IdRef {
const backing_bits = self.backingIntBits(bits).?;
const mask_value = if (bits == 64) 0xFFFF_FFFF_FFFF_FFFF else (@as(u64, 1) << @intCast(u6, bits)) - 1;