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py: Change jump-if-x-or-pop opcodes to have unsigned offset argument.

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These jumps are always forwards, and it's more efficient in the VM to
decode an unsigned argument.  These opcodes are already optimised versions
of the sequence "dup-top pop-jump-if-x pop" so it doesn't hurt generality
to optimise them further.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2022-03-21 16:36:13 +11:00
parent acd2c5c834
commit 6d11c69983
5 changed files with 11 additions and 13 deletions
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4
py/bc0.h
View File

@ -117,8 +117,8 @@
#define MP_BC_JUMP (MP_BC_BASE_JUMP_E + 0x02) // signed relative bytecode offset
#define MP_BC_POP_JUMP_IF_TRUE (MP_BC_BASE_JUMP_E + 0x03) // signed relative bytecode offset
#define MP_BC_POP_JUMP_IF_FALSE (MP_BC_BASE_JUMP_E + 0x04) // signed relative bytecode offset
#define MP_BC_JUMP_IF_TRUE_OR_POP (MP_BC_BASE_JUMP_E + 0x05) // signed relative bytecode offset
#define MP_BC_JUMP_IF_FALSE_OR_POP (MP_BC_BASE_JUMP_E + 0x06) // signed relative bytecode offset
#define MP_BC_JUMP_IF_TRUE_OR_POP (MP_BC_BASE_JUMP_E + 0x05) // unsigned relative bytecode offset
#define MP_BC_JUMP_IF_FALSE_OR_POP (MP_BC_BASE_JUMP_E + 0x06) // unsigned relative bytecode offset
#define MP_BC_SETUP_WITH (MP_BC_BASE_JUMP_E + 0x07) // unsigned relative bytecode offset
#define MP_BC_SETUP_EXCEPT (MP_BC_BASE_JUMP_E + 0x08) // unsigned relative bytecode offset
#define MP_BC_SETUP_FINALLY (MP_BC_BASE_JUMP_E + 0x09) // unsigned relative bytecode offset

2
py/emitbc.c
View File

@ -224,7 +224,7 @@ STATIC void emit_write_bytecode_byte_label(emit_t *emit, int stack_adj, byte b1,
mp_emit_bc_adjust_stack_size(emit, stack_adj);
// Determine if the jump offset is signed or unsigned, based on the opcode.
const bool is_signed = b1 <= MP_BC_JUMP_IF_FALSE_OR_POP;
const bool is_signed = b1 <= MP_BC_POP_JUMP_IF_FALSE;
// Default to a 2-byte encoding (the largest) with an unknown jump offset.
unsigned int jump_encoding_size = 1;

4
py/showbc.c
View File

@ -338,12 +338,12 @@ const byte *mp_bytecode_print_str(const mp_print_t *print, const byte *ip_start,
break;
case MP_BC_JUMP_IF_TRUE_OR_POP:
DECODE_SLABEL;
DECODE_ULABEL;
mp_printf(print, "JUMP_IF_TRUE_OR_POP " UINT_FMT, (mp_uint_t)(ip + unum - ip_start));
break;
case MP_BC_JUMP_IF_FALSE_OR_POP:
DECODE_SLABEL;
DECODE_ULABEL;
mp_printf(print, "JUMP_IF_FALSE_OR_POP " UINT_FMT, (mp_uint_t)(ip + unum - ip_start));
break;

8
py/vm.c
View File

@ -560,9 +560,9 @@ dispatch_loop:
}
ENTRY(MP_BC_JUMP_IF_TRUE_OR_POP): {
DECODE_SLABEL;
DECODE_ULABEL;
if (mp_obj_is_true(TOP())) {
ip += slab;
ip += ulab;
} else {
sp--;
}
@ -570,11 +570,11 @@ dispatch_loop:
}
ENTRY(MP_BC_JUMP_IF_FALSE_OR_POP): {
DECODE_SLABEL;
DECODE_ULABEL;
if (mp_obj_is_true(TOP())) {
sp--;
} else {
ip += slab;
ip += ulab;
}
DISPATCH_WITH_PEND_EXC_CHECK();
}

6
tools/mpy-tool.py
View File

@ -246,8 +246,8 @@ class Opcodes:
MP_BC_JUMP = (MP_BC_BASE_JUMP_E + 0x02) # signed relative bytecode offset
MP_BC_POP_JUMP_IF_TRUE = (MP_BC_BASE_JUMP_E + 0x03) # signed relative bytecode offset
MP_BC_POP_JUMP_IF_FALSE = (MP_BC_BASE_JUMP_E + 0x04) # signed relative bytecode offset
MP_BC_JUMP_IF_TRUE_OR_POP = (MP_BC_BASE_JUMP_E + 0x05) # signed relative bytecode offset
MP_BC_JUMP_IF_FALSE_OR_POP = (MP_BC_BASE_JUMP_E + 0x06) # signed relative bytecode offset
MP_BC_JUMP_IF_TRUE_OR_POP = (MP_BC_BASE_JUMP_E + 0x05) # unsigned relative bytecode offset
MP_BC_JUMP_IF_FALSE_OR_POP = (MP_BC_BASE_JUMP_E + 0x06) # unsigned relative bytecode offset
MP_BC_SETUP_WITH = (MP_BC_BASE_JUMP_E + 0x07) # unsigned relative bytecode offset
MP_BC_SETUP_EXCEPT = (MP_BC_BASE_JUMP_E + 0x08) # unsigned relative bytecode offset
MP_BC_SETUP_FINALLY = (MP_BC_BASE_JUMP_E + 0x09) # unsigned relative bytecode offset
@ -295,8 +295,6 @@ class Opcodes:
MP_BC_JUMP,
MP_BC_POP_JUMP_IF_TRUE,
MP_BC_POP_JUMP_IF_FALSE,
MP_BC_JUMP_IF_TRUE_OR_POP,
MP_BC_JUMP_IF_FALSE_OR_POP,
)
# Create a dict mapping opcode value to opcode name.