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host-utils: move checks out of divu128/divs128

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In preparation for changing the divu128/divs128 implementations
to allow for quotients larger than 64 bits, move the div-by-zero
and overflow checks to the callers.

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211025191154.350831-2-luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Luis Pires 2021-10-25 16:11:36 -03:00 • committed by Richard Henderson
parent 1c46937358
commit 9276a31c34
4 changed files with 42 additions and 51 deletions
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5
include/hw/clock.h
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@ -324,8 +324,9 @@ static inline uint64_t clock_ns_to_ticks(const Clock *clk, uint64_t ns)
return 0;
}
/*
* Ignore divu128() return value as we've caught div-by-zero and don't
* need different behaviour for overflow.
* BUG: when CONFIG_INT128 is not defined, the current implementation of
* divu128 does not return a valid truncated quotient, so the result will
* be wrong.
*/
divu128(&lo, &hi, clk->period);
return lo;