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Sema: implement comptime @memcpy

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This commit is contained in:
Andrew Kelley 2023-04-23 15:10:18 -07:00
parent 83a7303bbf
commit 482a0f648c
2 changed files with 37 additions and 6 deletions
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40
src/Sema.zig
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@ -21828,6 +21828,7 @@ fn zirMemcpy(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!void
const src_ptr = try sema.resolveInst(extra.rhs);
const dest_len = try indexablePtrLenOrNone(sema, block, dest_src, dest_ptr);
const src_len = try indexablePtrLenOrNone(sema, block, src_src, src_ptr);
const target = sema.mod.getTarget();
if (dest_len == .none and src_len == .none) {
const msg = msg: {
@ -21879,9 +21880,41 @@ fn zirMemcpy(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!void
const runtime_src = if (try sema.resolveDefinedValue(block, dest_src, dest_ptr)) |dest_ptr_val| rs: {
if (!dest_ptr_val.isComptimeMutablePtr()) break :rs dest_src;
if (try sema.resolveDefinedValue(block, src_src, src_ptr)) |src_ptr_val| {
_ = src_ptr_val;
return sema.fail(block, src, "TODO: @memcpy at comptime", .{});
if (try sema.resolveDefinedValue(block, src_src, src_ptr)) |_| {
const len_u64 = (try len_val.?.getUnsignedIntAdvanced(target, sema)).?;
const len = try sema.usizeCast(block, dest_src, len_u64);
for (0..len) |i| {
const elem_index = try sema.addIntUnsigned(Type.usize, i);
const dest_elem_ptr = try sema.elemPtr(
block,
src,
dest_ptr,
elem_index,
src,
true, // init
false, // oob_safety
);
const src_elem_ptr = try sema.elemPtr(
block,
src,
src_ptr,
elem_index,
src,
false, // init
false, // oob_safety
);
const uncoerced_elem = try sema.analyzeLoad(block, src, src_elem_ptr, src_src);
try sema.storePtr2(
block,
src,
dest_elem_ptr,
dest_src,
uncoerced_elem,
src_src,
.store,
);
}
return;
} else break :rs src_src;
} else dest_src;
@ -21902,7 +21935,6 @@ fn zirMemcpy(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!void
const dest_elem_ty = dest_ty.elemType2();
const src_elem_ty = src_ty.elemType2();
const target = sema.mod.getTarget();
if (.ok != try sema.coerceInMemoryAllowed(block, dest_elem_ty, src_elem_ty, true, target, dest_src, src_src)) {
return sema.fail(block, src, "TODO: lower @memcpy to a for loop because the element types have different ABI sizes", .{});
}

3
test/behavior/basic.zig
View File

@ -387,8 +387,7 @@ test "memcpy and memset intrinsics" {
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
try testMemcpyMemset();
// TODO add comptime test coverage
//comptime try testMemcpyMemset();
try comptime testMemcpyMemset();
}
fn testMemcpyMemset() !void {