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py/parsenum: Further reduce code size in check for inf/nan.

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A few more bytes can be saved by not using nested `if`s (4 bytes for
`build-MICROBIT/py/parsenum.o`, 8 bytes for RPI_PICO firmware).

This commit is better viewed with whitespace changes hidden, because
two blocks were reindented (e.g., `git show -b`).

Signed-off-by: Jeff Epler <jepler@gmail.com>
This commit is contained in:
Jeff Epler
2025-05-30 07:56:52 +02:00
committed by Damien George
parent 5eb9755259
commit c1629dc2ff
1 changed files with 11 additions and 17 deletions
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28
py/parsenum.c
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@@ -252,24 +252,18 @@ parse_start:
const char *str_val_start = str; const char *str_val_start = str;
// determine what the string is // determine what the string is
if (str + 2 < top && (str[0] | 0x20) == 'i') { if (str + 2 < top && (str[0] | 0x20) == 'i' && (str[1] | 0x20) == 'n' && (str[2] | 0x20) == 'f') {
// string starts with 'i', should be 'inf' or 'infinity' (case insensitive) // 'inf' or 'infinity' (case insensitive)
if ((str[1] | 0x20) == 'n' && (str[2] | 0x20) == 'f') { str += 3;
// inf dec_val = (mp_float_t)INFINITY;
str += 3; if (str + 4 < top && (str[0] | 0x20) == 'i' && (str[1] | 0x20) == 'n' && (str[2] | 0x20) == 'i' && (str[3] | 0x20) == 't' && (str[4] | 0x20) == 'y') {
dec_val = (mp_float_t)INFINITY; // infinity
if (str + 4 < top && (str[0] | 0x20) == 'i' && (str[1] | 0x20) == 'n' && (str[2] | 0x20) == 'i' && (str[3] | 0x20) == 't' && (str[4] | 0x20) == 'y') { str += 5;
// infinity
str += 5;
}
}
} else if (str + 2 < top && (str[0] | 0x20) == 'n') {
// string starts with 'n', should be 'nan' (case insensitive)
if ((str[1] | 0x20) == 'a' && (str[2] | 0x20) == 'n') {
// NaN
str += 3;
dec_val = MICROPY_FLOAT_C_FUN(nan)("");
} }
} else if (str + 2 < top && (str[0] | 0x20) == 'n' && (str[1] | 0x20) == 'a' && (str[2] | 0x20) == 'n') {
// 'nan' (case insensitive)
str += 3;
dec_val = MICROPY_FLOAT_C_FUN(nan)("");
} else { } else {
// string should be a decimal number // string should be a decimal number
parse_dec_in_t in = PARSE_DEC_IN_INTG; parse_dec_in_t in = PARSE_DEC_IN_INTG;