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py: Factor some code in inline thumb assembler to reduce code size.

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This commit is contained in:
Damien George 2015-02-24 16:35:37 +00:00
parent e41b21c01e
commit e5315f7ffd
1 changed files with 8 additions and 6 deletions
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14
py/emitinlinethumb.c
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@ -475,7 +475,7 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_a
reg_src = get_arg_reg(emit, op_str, pn_args[1], 7); reg_src = get_arg_reg(emit, op_str, pn_args[1], 7);
asm_thumb_format_4(emit->as, op_code, reg_dest, reg_src); asm_thumb_format_4(emit->as, op_code, reg_dest, reg_src);
} }
// search table // search table for ALU ops
for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_4_op_table); i++) { for (mp_uint_t i = 0; i < MP_ARRAY_SIZE(format_4_op_table); i++) {
if (strncmp(op_str, format_4_op_table[i].name, 3) == 0 && op_str[3] == '\0') { if (strncmp(op_str, format_4_op_table[i].name, 3) == 0 && op_str[3] == '\0') {
op_code = 0x4000 | (format_4_op_table[i].op << 4); op_code = 0x4000 | (format_4_op_table[i].op << 4);
@ -504,13 +504,15 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, mp_uint_t n_a
op_code = ASM_THUMB_FORMAT_3_SUB; op_code = ASM_THUMB_FORMAT_3_SUB;
goto op_format_3; goto op_format_3;
} else if (strcmp(op_str, "movw") == 0) { } else if (strcmp(op_str, "movw") == 0) {
mp_uint_t reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15); op_code = ASM_THUMB_OP_MOVW;
mp_uint_t reg_dest;
op_movw_movt:
reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15);
int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffff); int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffff);
asm_thumb_mov_reg_i16(emit->as, ASM_THUMB_OP_MOVW, reg_dest, i_src); asm_thumb_mov_reg_i16(emit->as, op_code, reg_dest, i_src);
} else if (strcmp(op_str, "movt") == 0) { } else if (strcmp(op_str, "movt") == 0) {
mp_uint_t reg_dest = get_arg_reg(emit, op_str, pn_args[0], 15); op_code = ASM_THUMB_OP_MOVT;
int i_src = get_arg_i(emit, op_str, pn_args[1], 0xffff); goto op_movw_movt;
asm_thumb_mov_reg_i16(emit->as, ASM_THUMB_OP_MOVT, reg_dest, i_src);
} else if (strcmp(op_str, "movwt") == 0) { } else if (strcmp(op_str, "movwt") == 0) {
// this is a convenience instruction // this is a convenience instruction
// we clear the MSB since it might be set from extracting the small int value // we clear the MSB since it might be set from extracting the small int value