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spirv: ptr_sub

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Implments the ptr_sub air tag. The code is unified with that of ptr_add.
This commit is contained in:
Robin Voetter 2023-05-19 13:04:53 +02:00
parent 091595ac37
commit 77b8bf2b82
No known key found for this signature in database
GPG Key ID: E755662F227CB468
2 changed files with 34 additions and 9 deletions
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42
src/codegen/spirv.zig
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@ -1743,6 +1743,7 @@ pub const DeclGen = struct {
.shuffle => try self.airShuffle(inst),
.ptr_add => try self.airPtrAdd(inst),
.ptr_sub => try self.airPtrSub(inst),
.bit_and => try self.airBinOpSimple(inst, .OpBitwiseAnd),
.bit_or => try self.airBinOpSimple(inst, .OpBitwiseOr),
@ -2126,14 +2127,7 @@ pub const DeclGen = struct {
return result_id;
}
fn airPtrAdd(self: *DeclGen, inst: Air.Inst.Index) !?IdRef {
if (self.liveness.isUnused(inst)) return null;
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const bin_op = self.air.extraData(Air.Bin, ty_pl.payload).data;
const ptr_id = try self.resolve(bin_op.lhs);
const offset_id = try self.resolve(bin_op.rhs);
const ptr_ty = self.air.typeOf(bin_op.lhs);
const result_ty = self.air.typeOfIndex(inst);
fn ptrAdd(self: *DeclGen, result_ty: Type, ptr_ty: Type, ptr_id: IdRef, offset_id: IdRef) !IdRef {
const result_ty_ref = try self.resolveType(result_ty, .direct);
switch (ptr_ty.ptrSize()) {
@ -2153,6 +2147,38 @@ pub const DeclGen = struct {
}
}
fn airPtrAdd(self: *DeclGen, inst: Air.Inst.Index) !?IdRef {
if (self.liveness.isUnused(inst)) return null;
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const bin_op = self.air.extraData(Air.Bin, ty_pl.payload).data;
const ptr_id = try self.resolve(bin_op.lhs);
const offset_id = try self.resolve(bin_op.rhs);
const ptr_ty = self.air.typeOf(bin_op.lhs);
const result_ty = self.air.typeOfIndex(inst);
return try self.ptrAdd(result_ty, ptr_ty, ptr_id, offset_id);
}
fn airPtrSub(self: *DeclGen, inst: Air.Inst.Index) !?IdRef {
if (self.liveness.isUnused(inst)) return null;
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const bin_op = self.air.extraData(Air.Bin, ty_pl.payload).data;
const ptr_id = try self.resolve(bin_op.lhs);
const ptr_ty = self.air.typeOf(bin_op.lhs);
const offset_id = try self.resolve(bin_op.rhs);
const offset_ty = self.air.typeOf(bin_op.rhs);
const offset_ty_ref = try self.resolveType(offset_ty, .direct);
const result_ty = self.air.typeOfIndex(inst);
const negative_offset_id = self.spv.allocId();
try self.func.body.emit(self.spv.gpa, .OpSNegate, .{
.id_result_type = self.typeId(offset_ty_ref),
.id_result = negative_offset_id,
.operand = offset_id,
});
return try self.ptrAdd(result_ty, ptr_ty, ptr_id, negative_offset_id);
}
fn cmp(
self: *DeclGen,
comptime op: std.math.CompareOperator,

1
test/behavior/pointers.zig
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@ -84,7 +84,6 @@ test "assigning integer to C pointer" {
test "C pointer comparison and arithmetic" {
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
const S = struct {
fn doTheTest() !void {