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This commit is contained in:
Olaf Seibert
2022-06-27 21:09:11 +02:00
parent edd43e8f1d
commit 08912623a9
1 changed files with 7 additions and 3 deletions
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10
tests/float.c
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@@ -702,7 +702,7 @@ int parse_float_m3(
* 0x19999999999999999
* 1 1001 1001 1001 ...
* which is 8 * 0011 0011 0011 ... aka 0x333...
* which is (2**64 - 1) / 5.
* which is (2**64 - 1) / 5 aka 0xFFF... / 5.
*/
uint64_t result = hi + float_save;
if (result == float_buf) {
@@ -715,14 +715,18 @@ int parse_float_m3(
}
}
#endif
#if 1 /* Try other methods to calculate the same thing more directly */
#if 0 /* Try other methods to calculate the same thing more directly */
{
uint64_t result = float_save / 5 * 8;
/* Try to fill in some of the lesser significant bits */
int round = float_save % 5;
if (round) {
// If round == 2, sometimes 2 needs to be added instead,
// to match the original calculation.
result += round * 8 / 5;
} else {
// decrement to match the original calculation, but
// the end result is ok without that.
//result--;
}
# if 0
@@ -738,7 +742,7 @@ int parse_float_m3(
DUMP3;
}
#endif
#if 0
#if 1
{
__uint128_t big = (__uint128_t)float_save << 3;