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target/i386: fix PHSUB* instructions with dest=src 

The computation must not overwrite neither the destination
nor the source before the last element has been computed.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-08-25 17:46:36 +02:00
parent 7b764d4173
commit 75046ad72e
1 changed files with 29 additions and 20 deletions
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49
target/i386/ops_sse.h
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@ -1528,34 +1528,43 @@ void glue(helper_pmaddubsw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
void glue(helper_phsubw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
{
d->W(0) = (int16_t)d->W(0) - (int16_t)d->W(1);
d->W(1) = (int16_t)d->W(2) - (int16_t)d->W(3);
XMM_ONLY(d->W(2) = (int16_t)d->W(4) - (int16_t)d->W(5));
XMM_ONLY(d->W(3) = (int16_t)d->W(6) - (int16_t)d->W(7));
d->W((2 << SHIFT) + 0) = (int16_t)s->W(0) - (int16_t)s->W(1);
d->W((2 << SHIFT) + 1) = (int16_t)s->W(2) - (int16_t)s->W(3);
XMM_ONLY(d->W(6) = (int16_t)s->W(4) - (int16_t)s->W(5));
XMM_ONLY(d->W(7) = (int16_t)s->W(6) - (int16_t)s->W(7));
Reg r;
r.W(0) = (int16_t)d->W(0) - (int16_t)d->W(1);
r.W(1) = (int16_t)d->W(2) - (int16_t)d->W(3);
XMM_ONLY(r.W(2) = (int16_t)d->W(4) - (int16_t)d->W(5));
XMM_ONLY(r.W(3) = (int16_t)d->W(6) - (int16_t)d->W(7));
r.W((2 << SHIFT) + 0) = (int16_t)s->W(0) - (int16_t)s->W(1);
r.W((2 << SHIFT) + 1) = (int16_t)s->W(2) - (int16_t)s->W(3);
XMM_ONLY(r.W(6) = (int16_t)s->W(4) - (int16_t)s->W(5));
XMM_ONLY(r.W(7) = (int16_t)s->W(6) - (int16_t)s->W(7));
MOVE(*d, r);
}
void glue(helper_phsubd, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
{
d->L(0) = (int32_t)d->L(0) - (int32_t)d->L(1);
XMM_ONLY(d->L(1) = (int32_t)d->L(2) - (int32_t)d->L(3));
d->L((1 << SHIFT) + 0) = (int32_t)s->L(0) - (int32_t)s->L(1);
XMM_ONLY(d->L(3) = (int32_t)s->L(2) - (int32_t)s->L(3));
Reg r;
r.L(0) = (int32_t)d->L(0) - (int32_t)d->L(1);
XMM_ONLY(r.L(1) = (int32_t)d->L(2) - (int32_t)d->L(3));
r.L((1 << SHIFT) + 0) = (int32_t)s->L(0) - (int32_t)s->L(1);
XMM_ONLY(r.L(3) = (int32_t)s->L(2) - (int32_t)s->L(3));
MOVE(*d, r);
}
void glue(helper_phsubsw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
{
d->W(0) = satsw((int16_t)d->W(0) - (int16_t)d->W(1));
d->W(1) = satsw((int16_t)d->W(2) - (int16_t)d->W(3));
XMM_ONLY(d->W(2) = satsw((int16_t)d->W(4) - (int16_t)d->W(5)));
XMM_ONLY(d->W(3) = satsw((int16_t)d->W(6) - (int16_t)d->W(7)));
d->W((2 << SHIFT) + 0) = satsw((int16_t)s->W(0) - (int16_t)s->W(1));
d->W((2 << SHIFT) + 1) = satsw((int16_t)s->W(2) - (int16_t)s->W(3));
XMM_ONLY(d->W(6) = satsw((int16_t)s->W(4) - (int16_t)s->W(5)));
XMM_ONLY(d->W(7) = satsw((int16_t)s->W(6) - (int16_t)s->W(7)));
Reg r;
r.W(0) = satsw((int16_t)d->W(0) - (int16_t)d->W(1));
r.W(1) = satsw((int16_t)d->W(2) - (int16_t)d->W(3));
XMM_ONLY(r.W(2) = satsw((int16_t)d->W(4) - (int16_t)d->W(5)));
XMM_ONLY(r.W(3) = satsw((int16_t)d->W(6) - (int16_t)d->W(7)));
r.W((2 << SHIFT) + 0) = satsw((int16_t)s->W(0) - (int16_t)s->W(1));
r.W((2 << SHIFT) + 1) = satsw((int16_t)s->W(2) - (int16_t)s->W(3));
XMM_ONLY(r.W(6) = satsw((int16_t)s->W(4) - (int16_t)s->W(5)));
XMM_ONLY(r.W(7) = satsw((int16_t)s->W(6) - (int16_t)s->W(7)));
MOVE(*d, r);
}
#define FABSB(_, x) (x > INT8_MAX ? -(int8_t)x : x)