diff options
Diffstat (limited to 'core/test-module.c')
| -rw-r--r-- | core/test-module.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/core/test-module.c b/core/test-module.c index d5b7eee..8ca031c 100644 --- a/core/test-module.c +++ b/core/test-module.c @@ -3987,7 +3987,43 @@ static void timers(void) { CHECK(load(bad, &module_b) == PURE_INVALID && strstr(error, "view with an effect")); } +/* A number is written with the fewest digits that read back as it, the + * digits %g gives (with its exponent's leading zeros dropped): the same + * text as that search over precisions, for values of every kind. */ +static void number_texts(void) { + uint32_t seed = 0x6e756d73u; + size_t checked = 0; + for (unsigned i = 0; i < 300000; ++i) { + double value; + uint64_t bits = (uint64_t)next_random(&seed) << 32 | next_random(&seed); + switch (i % 5) { + case 0: value = (double)((int64_t)(bits % 2000001) - 1000000) / 100.0; break; /* money */ + case 1: value = (double)(bits % 20000001) / pow(10, (double)(bits >> 40 & 7)); break; /* decimals */ + case 2: memcpy(&value, &bits, sizeof(value)); if (!isfinite(value)) value = 0.75; break; + case 3: value = (double)(bits % 100000) / 7.0; break; + default: value = ldexp((double)(bits >> 11), (int)(bits % 80) - 60); break; + } + char got[32], want[32]; + pure_format_number(value, got); + if (value == 0) strcpy(want, "0"); + else if (value == floor(value) && fabs(value) < 1e15) snprintf(want, sizeof(want), "%.0f", value); + else { + for (int precision = 1; precision <= 17; ++precision) { + snprintf(want, sizeof(want), "%.*g", precision, value); + if (strtod(want, NULL) == value) break; + } + char *exponent = strchr(want, 'e'); + if (exponent) + while (exponent[2] == '0' && exponent[3]) memmove(exponent + 2, exponent + 3, strlen(exponent + 2)); + } + CHECK(!strcmp(got, want) && strtod(got, NULL) == value); + ++checked; + } + printf("{\"number_texts\":%zu}\n", checked); +} + int main(void) { + number_texts(); behaviour(); faults(); rejections(); |