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wasm: Support bitcasting between floats and ints

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Luuk de Gram 2022-11-22 18:57:34 +01:00
parent 2be0d5bbca
commit 7cf442cabc
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1 changed files with 21 additions and 0 deletions
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src/arch/wasm/CodeGen.zig
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@ -3091,11 +3091,32 @@ fn airBitcast(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
const ty_op = func.air.instructions.items(.data)[inst].ty_op;
const result = if (!func.liveness.isUnused(inst)) result: {
const operand = try func.resolveInst(ty_op.operand);
const wanted_ty = func.air.typeOfIndex(inst);
const given_ty = func.air.typeOf(ty_op.operand);
if (given_ty.isAnyFloat() or wanted_ty.isAnyFloat()) {
const bitcast_result = try func.bitcast(wanted_ty, given_ty, operand);
break :result try bitcast_result.toLocal(func, wanted_ty);
}
break :result func.reuseOperand(ty_op.operand, operand);
} else WValue{ .none = {} };
func.finishAir(inst, result, &.{});
}
fn bitcast(func: *CodeGen, wanted_ty: Type, given_ty: Type, operand: WValue) InnerError!WValue {
// if we bitcast a float to or from an integer we must use the 'reinterpret' instruction
if (!(wanted_ty.isAnyFloat() or given_ty.isAnyFloat())) return operand;
assert((wanted_ty.isInt() and given_ty.isAnyFloat()) or (wanted_ty.isAnyFloat() and given_ty.isInt()));
const opcode = buildOpcode(.{
.op = .reinterpret,
.valtype1 = typeToValtype(wanted_ty, func.target),
.valtype2 = typeToValtype(given_ty, func.target),
});
try func.emitWValue(operand);
try func.addTag(Mir.Inst.Tag.fromOpcode(opcode));
return WValue{ .stack = {} };
}
fn airStructFieldPtr(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
const ty_pl = func.air.instructions.items(.data)[inst].ty_pl;
const extra = func.air.extraData(Air.StructField, ty_pl.payload);