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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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14
target/ppc/int_helper.c
View file

@ -104,10 +104,11 @@ uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe)
uint64_t rt = 0;
int overflow = 0;
overflow = divu128(&rt, &ra, rb);
if (unlikely(overflow)) {
if (unlikely(rb == 0 || ra >= rb)) {
overflow = 1;
rt = 0; /* Undefined */
} else {
divu128(&rt, &ra, rb);
}
if (oe) {
@ -122,10 +123,13 @@ uint64_t helper_divde(CPUPPCState *env, uint64_t rau, uint64_t rbu, uint32_t oe)
int64_t rt = 0;
int64_t ra = (int64_t)rau;
int64_t rb = (int64_t)rbu;
int overflow = divs128(&rt, &ra, rb);
int overflow = 0;
if (unlikely(overflow)) {
if (unlikely(rb == 0 || uabs64(ra) >= uabs64(rb))) {
overflow = 1;
rt = 0; /* Undefined */
} else {
divs128(&rt, &ra, rb);
}
if (oe) {