[Bug target/100152] [10.3, 11, 12 Regression] used caller-saved register not preserved across a call.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100152 --- Comment #29 from Iain Sandoe --- what is also somewhat peculiar is that replacing the first function in the reduced test case with "extern void ___UTF_8_put(char *a, int b);" changes the code-gen for the second function.
[Bug target/100152] [10.3, 11, 12 Regression] used caller-saved register not preserved across a call.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100152
--- Comment #28 from Iain Sandoe ---
reduced test case:
___UTF_8_put(char *a, int b) {
char *c = a;
int bytes;
if (b <= 15)
bytes = 2;
else if (b <= 255)
bytes = 4;
else if (b <= 4095)
bytes = 5;
else
bytes = 6;
c = *a = c;
switch (bytes) {
case 6:
*--c = b >>= 6;
case 5:
*--c = b;
b >>= 6;
}
*c = bytes + b;
}
___SCMOBJ_to_NONNULLSTRING(d) {
{
unsigned long g, h;
char c;
h = ((long *)1)[1];
g = 0;
for (; g < h; g++)
i();
g = 0;
for (; g < h; g++)
___UTF_8_put(c, (long)*((unsigned *)d + (g << 2 >> 2)) << 2 >> 2);
}
}
[Bug target/100152] [10.3, 11, 12 Regression] used caller-saved register not preserved across a call.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100152 Iain Sandoe changed: What|Removed |Added CC||rguenth at gcc dot gnu.org Summary|[10.3, 11, 12 Regression] |[10.3, 11, 12 Regression] |[Darwin, X86] used |used caller-saved register |caller-saved register not |not preserved across a |preserved across a call.|call. --- Comment #27 from Iain Sandoe --- this is caused by, or exposed by, r10-9246-geddcb627ccfbd97e025cf366cc3f3bad76211785 since that's a change in tree optimisation, the problem might not be confined to Darwin, but I wasn't able to get the preprocessed source attached here to produce wrong code on Linux. For x86_64, the Darwin ABI is supposed to be same as Linux - and as noted, there is not so much Darwin-specific back end code (but, of course, there is some).
