diff options
Diffstat (limited to 'src/arch/wasm/CodeGen.zig')
| -rw-r--r-- | src/arch/wasm/CodeGen.zig | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/arch/wasm/CodeGen.zig b/src/arch/wasm/CodeGen.zig index 14d2cf95c4..af54043f7a 100644 --- a/src/arch/wasm/CodeGen.zig +++ b/src/arch/wasm/CodeGen.zig @@ -4160,7 +4160,7 @@ fn airIntcast(func: *CodeGen, inst: Air.Inst.Index) InnerError!void { const op_bits = toWasmBits(@as(u16, @intCast(operand_ty.bitSize(mod)))).?; const wanted_bits = toWasmBits(@as(u16, @intCast(ty.bitSize(mod)))).?; - const result = if (op_bits == wanted_bits) + const result = if (op_bits == wanted_bits and !ty.isSignedInt(mod)) func.reuseOperand(ty_op.operand, operand) else try (try func.intcast(operand, operand_ty, ty)).toLocal(func, ty); @@ -4181,7 +4181,19 @@ fn intcast(func: *CodeGen, operand: WValue, given: Type, wanted: Type) InnerErro const op_bits = toWasmBits(given_bitsize).?; const wanted_bits = toWasmBits(wanted_bitsize).?; - if (op_bits == wanted_bits) return operand; + if (op_bits == wanted_bits) { + if (given.isSignedInt(mod)) { + if (given_bitsize < wanted_bitsize) { + // signed integers are stored as two's complement, + // when we upcast from a smaller integer to larger + // integers, we must get its absolute value similar to + // i64_extend_i32_s instruction. + return func.signAbsValue(operand, given); + } + return func.wrapOperand(operand, wanted); + } + return operand; + } if (op_bits > 32 and op_bits <= 64 and wanted_bits == 32) { try func.emitWValue(operand); |