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Remove undefined behaviors

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This commit is contained in:
Justine Tunney 2021-05-16 11:16:28 -07:00
parent 4864565198
commit b3838173ec
51 changed files with 756 additions and 1302 deletions
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15
libc/fmt/fmt.c
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@ -612,7 +612,7 @@ hidden int __fmt(void *fn, void *arg, const char *format, va_list va) {
if (pun.d && prec < 13) {
pun.u[1] |= 0x100000;
if (prec < 5) {
ui = 1 << ((5 - prec) * 4 - 1);
ui = 1u << ((5 - prec) * 4 - 1);
if (pun.u[1] & ui) {
if (pun.u[1] & ((ui - 1) | (ui << 1)) || pun.u[0]) {
pun.u[1] += ui;
@ -631,7 +631,7 @@ hidden int __fmt(void *fn, void *arg, const char *format, va_list va) {
}
} else {
i1 = (13 - prec) * 4;
ui = 1 << (i1 - 1);
ui = 1u << (i1 - 1);
if (pun.u[0] & ui && pun.u[0] & ((ui - 1) | (ui << 1))) {
pun.u[0] += ui;
if (!(pun.u[0] >> i1)) goto BumpIt;
@ -640,12 +640,13 @@ hidden int __fmt(void *fn, void *arg, const char *format, va_list va) {
}
} else {
if ((ui = pun.u[0])) {
for (prec = 6; (ui = (ui << 4) & 0xffffffff); ++prec) {
}
ui = __builtin_ctz(ui);
prec = 6 + ((32 - ROUNDDOWN(ui, 4)) >> 2) - 1;
} else if ((ui = pun.u[1] & 0xfffff)) {
ui = __builtin_ctz(ui);
prec = (20 - ROUNDDOWN(ui, 4)) >> 2;
} else {
for (prec = 0, ui = pun.u[1] & 0xfffff; ui;
++prec, ui = (ui << 4) & 0xfffff) {
}
prec = 0;
}
}
bw = 1;