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py: Make UNARY_OP_NOT a first-class op, to agree with Py not semantics.

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Fixes #1684 and makes "not" match Python semantics.  The code is also
simplified (the separate MP_BC_NOT opcode is removed) and the patch saves
68 bytes for bare-arm/ and 52 bytes for minimal/.

Previously "not x" was implemented as !mp_unary_op(x, MP_UNARY_OP_BOOL),
so any given object only needs to implement MP_UNARY_OP_BOOL (and the VM
had a special opcode to do the ! bit).

With this patch "not x" is implemented as mp_unary_op(x, MP_UNARY_OP_NOT),
but this operation is caught at the start of mp_unary_op and dispatched as
!mp_obj_is_true(x).  mp_obj_is_true has special logic to test for
truthness, and is the correct way to handle the not operation.
This commit is contained in:
Damien George
2015-12-08 12:28:11 +00:00
parent e242b1785f
commit bdbe8c9ae2
9 changed files with 12 additions and 47 deletions
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2
py/runtime0.h
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@@ -45,8 +45,6 @@ typedef enum {
MP_UNARY_OP_POSITIVE,
MP_UNARY_OP_NEGATIVE,
MP_UNARY_OP_INVERT,
// The NOT op is only implemented by bool. The emitter must synthesise NOT
// for other types by calling BOOL then inverting (eg by then calling NOT).
MP_UNARY_OP_NOT,
} mp_unary_op_t;