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Damien George 9766fddcdc py/mpz: Simplify handling of borrow and quo adjustment in mpn_div. 
The motivation behind this patch is to remove unreachable code in mpn_div.
This unreachable code was added some time ago in
9a21d2e070, when a loop in mpn_div was copied
and adjusted to work when mpz_dig_t was exactly half of the size of
mpz_dbl_dig_t (a common case).  The loop was copied correctly but it wasn't
noticed at the time that the final part of the calculation of num-quo*den
could be optimised, and hence unreachable code was left for a case that
never occurred.

The observation for the optimisation is that the initial value of quo in
mpn_div is either exact or too large (never too small), and therefore the
subtraction of quo*den from num may subtract exactly enough or too much
(but never too little).  Using this observation the part of the algorithm
that handles the borrow value can be simplified, and most importantly this
eliminates the unreachable code.

The new code has been tested with DIG_SIZE=3 and DIG_SIZE=4 by dividing all
possible combinations of non-negative integers with between 0 and 3
(inclusive) mpz digits.
 		2017-12-29 14:05:48 +11:00
..
argcheck.c py/argcheck: Remove #if guard around terse error message helper func. 2017-10-19 18:57:26 +11:00
asmarm.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
asmarm.h py/emitnative: Clean up asm macro names so they have dest as first arg. 2017-11-15 11:46:49 +11:00
asmbase.c py/asmbase: Revert removal of clearing of label offsets for native emit. 2017-12-08 19:07:00 +11:00
asmbase.h py/asm: Remove need for dummy_data when doing initial assembler passes. 2016-12-09 22:50:58 +11:00
asmthumb.c py/asmthumb: Use existing macro to properly clear the D-cache. 2017-08-23 11:32:27 +10:00
asmthumb.h py/emitnative: Clean up asm macro names so they have dest as first arg. 2017-11-15 11:46:49 +11:00
asmx64.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
asmx64.h py/emitnative: Clean up asm macro names so they have dest as first arg. 2017-11-15 11:46:49 +11:00
asmx86.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
asmx86.h py/emitnative: Clean up asm macro names so they have dest as first arg. 2017-11-15 11:46:49 +11:00
asmxtensa.c py/asm: Remove need for dummy_data when doing initial assembler passes. 2016-12-09 22:50:58 +11:00
asmxtensa.h py/emitnative: Clean up asm macro names so they have dest as first arg. 2017-11-15 11:46:49 +11:00
bc.c py/bc: Update opcode_format_table to match the bytecode. 2017-10-10 10:37:38 +11:00
bc.h all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
bc0.h py: Clean up unary and binary enum list to keep groups together. 2017-10-05 10:49:44 +11:00
binary.c py/objstr: Remove "make_qstr_if_not_already" arg from mp_obj_new_str. 2017-11-16 13:17:51 +11:00
binary.h py/binary: Change internal bytearray typecode from 0 to 1. 2017-08-17 16:19:35 +10:00
builtin.h py/builtinhelp: Change signature of help text var from pointer to array. 2017-09-12 16:03:52 +10:00
builtinevex.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
builtinhelp.c py/objstr: Remove "make_qstr_if_not_already" arg from mp_obj_new_str. 2017-11-16 13:17:51 +11:00
builtinimport.c py/builtinimport: Call __init__ for modules imported via a weak link. 2017-12-13 14:48:53 +11:00
compile.c py: Convert all uses of alloca() to use new scoped allocation API. 2017-12-11 13:49:09 +11:00
compile.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
emit.h all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
emitbc.c py/{emitbc,asmbase}: Only clear emit labels to -1 when in debug mode. 2017-12-08 18:23:23 +11:00
emitcommon.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
emitglue.c py: Add verbose debug compile-time flag MICROPY_DEBUG_VERBOSE. 2017-08-15 11:53:36 +10:00
emitglue.h py/emitglue: Change type of bit-field to explicitly unsigned mp_uint_t. 2017-12-15 10:21:10 +11:00
emitinlinethumb.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
emitinlinextensa.c py/emitinline: Move common code for end of final pass to compiler. 2016-12-09 21:23:17 +11:00
emitnative.c py/emitnative: Clean up asm macro names so they have dest as first arg. 2017-11-15 11:46:49 +11:00
formatfloat.c py/formatfloat: Use standard isinf, isnan funcs instead of custom ones. 2017-10-10 16:27:54 +11:00
formatfloat.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
frozenmod.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
frozenmod.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
gc.c py: Introduce a Python stack for scoped allocation. 2017-12-11 13:49:09 +11:00
gc.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
grammar.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
lexer.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
lexer.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
makeqstrdata.py py/objtype: Fit qstrs for special methods in byte type. 2017-10-21 11:06:32 +03:00
makeqstrdefs.py py/makeqstrdefs.py: Make script run correctly with Python 2.6. 2017-06-09 13:42:13 +10:00
makeversionhdr.py py/makeversionhdr.py: Update to parse new release line in docs/conf.py. 2017-07-04 22:37:41 +10:00
malloc.c py/malloc: Remove unneeded code checking m_malloc return value. 2017-12-20 16:55:42 +11:00
map.c py/map: Don't include ordered-dict mutating code when not needed. 2017-12-19 13:37:15 +11:00
misc.h py/misc.h: Add m_new_obj_var_with_finaliser(). 2017-12-04 11:05:49 +02:00
mkenv.mk py/mkenv.mk: Use $(PYTHON) consistently when calling Python tools. 2017-11-15 11:56:58 +11:00
mkrules.mk py/mkrules.mk: Add "clean-frozen" target to clean frozen script/modules dir. 2017-12-10 01:05:29 +02:00
modarray.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
modbuiltins.c py/modbuiltins: Use standard arg-parsing helper func for builtin print. 2017-12-05 12:14:57 +11:00
modcmath.c py: Change obsolete "///" comment formatting to normal comments. 2017-08-30 21:02:00 +10:00
modcollections.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
modgc.c py: Change obsolete "///" comment formatting to normal comments. 2017-08-30 21:02:00 +10:00
modio.c py/modio: Use correct config macro to enable resource_stream function. 2017-12-19 16:59:08 +11:00
modmath.c py/modmath: Convert log2 macro into a function. 2017-10-10 16:01:04 +11:00
modmicropython.c py: Introduce a Python stack for scoped allocation. 2017-12-11 13:49:09 +11:00
modstruct.c py/modstruct: Check and prevent buffer-write overflow in struct packing. 2017-09-01 11:11:09 +10:00
modsys.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
modthread.c py: Introduce a Python stack for scoped allocation. 2017-12-11 13:49:09 +11:00
moduerrno.c py/moduerrno: Make list of errno codes configurable. 2017-02-22 12:58:11 +11:00
mpconfig.h py/objgenerator: Allow to pend an exception for next execution. 2017-12-15 20:20:36 +02:00
mperrno.h py/mperrno: Allow mperrno.h to be correctly included before other hdrs. 2017-07-24 18:41:24 +10:00
mphal.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
mpprint.c py/mpprint: Fix "%x" vs "%X" regression introduced in previous commit. 2017-12-07 10:31:14 +02:00
mpprint.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
mpstate.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
mpstate.h py/mpstate.h: Remove obsolete comment about nlr_top being coded in asm. 2017-12-11 22:51:52 +11:00
mpthread.h all: Unify header guard usage. 2017-07-18 11:57:39 +10:00
mpz.c py/mpz: Simplify handling of borrow and quo adjustment in mpn_div. 2017-12-29 14:05:48 +11:00
mpz.h py/mpz: Simplify handling of borrow and quo adjustment in mpn_div. 2017-12-29 14:05:48 +11:00
nativeglue.c py/emitnative: Implement floor-division and modulo for viper emitter. 2017-10-11 18:54:34 +11:00
nlr.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlr.h py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlrsetjmp.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlrthumb.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlrx64.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlrx86.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlrxtensa.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
obj.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
obj.h py: Extend nan-boxing config to have 47-bit small integers. 2017-12-11 22:39:12 +11:00
objarray.c py/runtime: Add MP_BINARY_OP_CONTAINS as reverse of MP_BINARY_OP_IN. 2017-11-24 14:48:23 +11:00
objarray.h all: Unify header guard usage. 2017-07-18 11:57:39 +10:00
objattrtuple.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objbool.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objboundmeth.c py: Convert all uses of alloca() to use new scoped allocation API. 2017-12-11 13:49:09 +11:00
objcell.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objclosure.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objcomplex.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objdict.c py/objdict: Reuse dict-view key iterator for standard dict iterator. 2017-11-27 23:40:31 +11:00
objenumerate.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objexcept.c py/objtype: Implement better support for overriding native's __init__. 2017-12-12 16:43:16 +11:00
objexcept.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objfilter.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objfloat.c py/objfloat: Allow float() to parse anything with the buffer protocol. 2017-11-21 15:01:38 +11:00
objfun.c py: Convert all uses of alloca() to use new scoped allocation API. 2017-12-11 13:49:09 +11:00
objfun.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objgenerator.c py/objgenerator: Allow to pend an exception for next execution. 2017-12-15 20:20:36 +02:00
objgenerator.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objgetitemiter.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objint.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objint.h py/modbuiltins: Implement abs() by dispatching to MP_UNARY_OP_ABS. 2017-09-18 00:06:43 +03:00
objint_longlong.c py/objint_longlong: Check for zero division/modulo. 2017-12-08 20:40:55 +02:00
objint_mpz.c py/runtime: Add MP_BINARY_OP_CONTAINS as reverse of MP_BINARY_OP_IN. 2017-11-24 14:48:23 +11:00
objlist.c all: Use NULL instead of "" when calling mp_raise exception helpers. 2017-10-24 22:39:36 +11:00
objlist.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objmap.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objmodule.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objmodule.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objnamedtuple.c py/objnamedtuple: Allow to reuse namedtuple basic functionality. 2017-11-20 09:30:06 +02:00
objnamedtuple.h py/objnamedtuple: Allow to reuse namedtuple basic functionality. 2017-11-20 09:30:06 +02:00
objnone.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objobject.c py/objtype: Refactor object's handling of __new__ to not create 2 objs. 2017-12-12 16:53:44 +11:00
objpolyiter.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objproperty.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objrange.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objreversed.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objset.c py/objset: Remove unneeded check from set_equal. 2017-12-19 14:01:19 +11:00
objsingleton.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objslice.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objstr.c py: Annotate func defs with NORETURN when their corresp decls have it. 2017-11-29 15:43:40 +11:00
objstr.h py/objstr: Make mp_obj_new_str_of_type check for existing interned qstr. 2017-11-16 13:53:04 +11:00
objstringio.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objstringio.h py/objstringio: If created from immutable object, follow copy on write policy. 2017-06-09 17:33:01 +03:00
objstrunicode.c py/objstr: Remove "make_qstr_if_not_already" arg from mp_obj_new_str. 2017-11-16 13:17:51 +11:00
objtuple.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objtuple.h all: Convert mp_uint_t to mp_unary_op_t/mp_binary_op_t where appropriate 2017-08-29 13:16:30 +10:00
objtype.c py/objtype: Refactor object's handling of __new__ to not create 2 objs. 2017-12-12 16:53:44 +11:00
objtype.h py/objtype: Refactor object's handling of __new__ to not create 2 objs. 2017-12-12 16:53:44 +11:00
objzip.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
opmethods.c py/runtime: Add MP_BINARY_OP_CONTAINS as reverse of MP_BINARY_OP_IN. 2017-11-24 14:48:23 +11:00
parse.c py/parse: Fix macro evaluation by avoiding empty __VA_ARGS__. 2017-12-29 13:44:26 +11:00
parse.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
parsenum.c py/parsenum: Improve parsing of floating point numbers. 2017-11-27 12:51:52 +11:00
parsenum.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
parsenumbase.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
parsenumbase.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
persistentcode.c py/persistentcode: Bump .mpy version number to version 3. 2017-10-05 10:49:44 +11:00
persistentcode.h py: Factor out persistent-code reader into separate files. 2016-11-16 18:13:50 +11:00
py.mk py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
pystack.c py: Introduce a Python stack for scoped allocation. 2017-12-11 13:49:09 +11:00
pystack.h py: Introduce a Python stack for scoped allocation. 2017-12-11 13:49:09 +11:00
qstr.c py/qstr: Rewrite find_qstr to make manifest that it returns a valid ptr. 2017-11-29 17:01:39 +11:00
qstr.h py/compile: Use alloca instead of qstr_build when compiling import name. 2017-11-01 13:16:16 +11:00
qstrdefs.h py/modbuiltins: Use standard arg-parsing helper func for builtin print. 2017-12-05 12:14:57 +11:00
reader.c all: Don't include system errno.h when it's not needed. 2017-07-24 18:43:14 +10:00
reader.h py: Allow lexer to raise exceptions during construction. 2017-03-14 11:52:05 +11:00
repl.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
repl.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
ringbuf.h all: Unify header guard usage. 2017-07-18 11:57:39 +10:00
runtime.c py/runtime: Remove unnecessary break statements from switch. 2017-12-19 13:13:21 +11:00
runtime.h py: Introduce a Python stack for scoped allocation. 2017-12-11 13:49:09 +11:00
runtime0.h py/runtime: Add MP_BINARY_OP_CONTAINS as reverse of MP_BINARY_OP_IN. 2017-11-24 14:48:23 +11:00
runtime_utils.c py: mp_call_function_*_protected(): Pass-thru return value if possible. 2017-12-05 00:38:41 +02:00
scheduler.c py: Add micropython.schedule() function and associated runtime code. 2017-03-20 15:20:26 +11:00
scope.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
scope.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
sequence.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
showbc.c py: Clean up unary and binary enum list to keep groups together. 2017-10-05 10:49:44 +11:00
smallint.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
smallint.h py: Extend nan-boxing config to have 47-bit small integers. 2017-12-11 22:39:12 +11:00
stackctrl.c py/runtime: Move mp_exc_recursion_depth to runtime and rename to raise. 2017-12-11 13:49:09 +11:00
stackctrl.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
stream.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
stream.h py/objstringio: Fix regression with handling SEEK_SET. 2017-08-20 22:02:41 +03:00
unicode.c py/objstr: Add check for valid UTF-8 when making a str from bytes. 2017-09-06 16:43:09 +10:00
unicode.h py/objstr: Add check for valid UTF-8 when making a str from bytes. 2017-09-06 16:43:09 +10:00
vm.c py/runtime: Use the Python stack when building *arg and **kwarg state. 2017-12-11 13:49:09 +11:00
vmentrytable.h py: Clean up unary and binary enum list to keep groups together. 2017-10-05 10:49:44 +11:00
vstr.c py/vstr: Raise a RuntimeError if fixed vstr buffer overflows. 2017-09-21 20:29:41 +10:00
warning.c py: Add config option to print warnings/errors to stderr. 2017-09-26 11:59:11 +10:00