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stage2-wasm: clean memcpy + fix another bug in aggr_init for optionals arr

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This commit is contained in:
Pavel Verigo 2025-02-27 18:25:38 +01:00
parent 15bc2ab0a8
commit 0e109add37
2 changed files with 16 additions and 11 deletions
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26
src/arch/wasm/CodeGen.zig
View File

@ -1588,12 +1588,18 @@ fn toWasmBits(bits: u16) ?u16 {
/// Performs a copy of bytes for a given type. Copying all bytes
/// from rhs to lhs.
fn memcpy(cg: *CodeGen, dst: WValue, src: WValue, len: WValue) !void {
const len_known_neq_0 = switch (len) {
.imm32 => |val| if (val != 0) true else return,
.imm64 => |val| if (val != 0) true else return,
else => false,
};
// When bulk_memory is enabled, we lower it to wasm's memcpy instruction.
// If not, we lower it ourselves manually
if (std.Target.wasm.featureSetHas(cg.target.cpu.features, .bulk_memory)) {
const len0_ok = std.Target.wasm.featureSetHas(cg.target.cpu.features, .nontrapping_bulk_memory_len0);
const emit_check = !(len0_ok or len_known_neq_0);
if (!len0_ok) {
if (emit_check) {
try cg.startBlock(.block, .empty);
// Even if `len` is zero, the spec requires an implementation to trap if `src + len` or
@ -1616,7 +1622,7 @@ fn memcpy(cg: *CodeGen, dst: WValue, src: WValue, len: WValue) !void {
try cg.emitWValue(len);
try cg.addExtended(.memory_copy);
if (!len0_ok) {
if (emit_check) {
try cg.endBlock();
}
@ -5196,9 +5202,7 @@ fn airAggregateInit(cg: *CodeGen, inst: Air.Inst.Index) InnerError!void {
const result = try cg.allocStack(result_ty);
const elem_ty = result_ty.childType(zcu);
const elem_size = @as(u32, @intCast(elem_ty.abiSize(zcu)));
const sentinel = if (result_ty.sentinel(zcu)) |sent| blk: {
break :blk try cg.lowerConstant(sent, elem_ty);
} else null;
const sentinel = result_ty.sentinel(zcu);
// When the element type is by reference, we must copy the entire
// value. It is therefore safer to move the offset pointer and store
@ -5211,12 +5215,13 @@ fn airAggregateInit(cg: *CodeGen, inst: Air.Inst.Index) InnerError!void {
const elem_val = try cg.resolveInst(elem);
try cg.store(offset, elem_val, elem_ty, 0);
if (elem_index < elements.len - 1 and sentinel == null) {
if (elem_index < elements.len - 1 or sentinel != null) {
_ = try cg.buildPointerOffset(offset, elem_size, .modify);
}
}
if (sentinel) |sent| {
try cg.store(offset, sent, elem_ty, 0);
if (sentinel) |s| {
const val = try cg.resolveInst(Air.internedToRef(s.toIntern()));
try cg.store(offset, val, elem_ty, 0);
}
} else {
var offset: u32 = 0;
@ -5225,8 +5230,9 @@ fn airAggregateInit(cg: *CodeGen, inst: Air.Inst.Index) InnerError!void {
try cg.store(result, elem_val, elem_ty, offset);
offset += elem_size;
}
if (sentinel) |sent| {
try cg.store(result, sent, elem_ty, offset);
if (sentinel) |s| {
const val = try cg.resolveInst(Air.internedToRef(s.toIntern()));
try cg.store(result, val, elem_ty, offset);
}
}
break :result_value result;

1
test/behavior/tuple.zig
View File

@ -507,7 +507,6 @@ test "tuple with runtime value coerced into a slice with a sentinel" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;