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wasm: more liveness fixes

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This commit is contained in:
Luuk de Gram 2023-05-07 18:48:25 +02:00
parent 67d27dbe63
commit f2860bb4f4
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1 changed files with 4 additions and 3 deletions
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7
src/arch/wasm/CodeGen.zig
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@ -880,10 +880,11 @@ fn processDeath(func: *CodeGen, ref: Air.Inst.Ref) void {
// TODO: Upon branch consolidation free any locals if needed.
const value = func.currentBranch().values.getPtr(ref) orelse return;
if (value.* != .local) return;
log.debug("Decreasing reference for ref: %{?d}\n", .{Air.refToIndex(ref)});
if (value.local.value < func.arg_index) {
const reserved_indexes = func.args.len + @boolToInt(func.return_value != .none);
if (value.local.value < reserved_indexes) {
return; // function arguments can never be re-used
}
log.debug("Decreasing reference for ref: %{?d}, using local '{d}'\n", .{ Air.refToIndex(ref), value.local.value });
value.local.references -= 1; // if this panics, a call to `reuseOperand` was forgotten by the developer
if (value.local.references == 0) {
value.free(func);
@ -4024,7 +4025,7 @@ fn airIntcast(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
return func.fail("todo Wasm intcast for bitsize > 128", .{});
}
const op_bits = toWasmBits(@intCast(u16, ty.bitSize(func.target))).?;
const op_bits = toWasmBits(@intCast(u16, operand_ty.bitSize(func.target))).?;
const wanted_bits = toWasmBits(@intCast(u16, ty.bitSize(func.target))).?;
const result = if (op_bits == wanted_bits)
func.reuseOperand(ty_op.operand, operand)