target/i386: do not access beyond the low 128 bits of SSE registers
The i386 target consolidates all vector registers so that instead of XMMReg, YMMReg and ZMMReg structs there is a single ZMMReg that can fit all of SSE, AVX and AVX512. When TCG copies data from and to the SSE registers, it uses the full 64-byte width. This is not a correctness issue because TCG never lets guest code see beyond the first 128 bits of the ZMM registers, however it causes uninitialized stack memory to make it to the CPU's migration stream. Fix it by only copying the low 16 bytes of the ZMMReg union into the destination register. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -22,6 +22,7 @@
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#if SHIFT == 0
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#define Reg MMXReg
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#define SIZE 8
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#define XMM_ONLY(...)
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#define B(n) MMX_B(n)
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#define W(n) MMX_W(n)
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@ -30,6 +31,7 @@
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#define SUFFIX _mmx
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#else
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#define Reg ZMMReg
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#define SIZE 16
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#define XMM_ONLY(...) __VA_ARGS__
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#define B(n) ZMM_B(n)
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#define W(n) ZMM_W(n)
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@ -38,6 +40,22 @@
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#define SUFFIX _xmm
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#endif
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/*
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* Copy the relevant parts of a Reg value around. In the case where
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* sizeof(Reg) > SIZE, these helpers operate only on the lower bytes of
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* a 64 byte ZMMReg, so we must copy only those and keep the top bytes
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* untouched in the guest-visible destination destination register.
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* Note that the "lower bytes" are placed last in memory on big-endian
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* hosts, which store the vector backwards in memory. In that case the
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* copy *starts* at B(SIZE - 1) and ends at B(0), the opposite of
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* the little-endian case.
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*/
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#if HOST_BIG_ENDIAN
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#define MOVE(d, r) memcpy(&((d).B(SIZE - 1)), &(r).B(SIZE - 1), SIZE)
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#else
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#define MOVE(d, r) memcpy(&(d).B(0), &(r).B(0), SIZE)
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#endif
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void glue(helper_psrlw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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{
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int shift;
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@ -516,7 +534,7 @@ void glue(helper_pshufw, SUFFIX)(Reg *d, Reg *s, int order)
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r.W(1) = s->W((order >> 2) & 3);
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r.W(2) = s->W((order >> 4) & 3);
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r.W(3) = s->W((order >> 6) & 3);
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*d = r;
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MOVE(*d, r);
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}
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#else
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void helper_shufps(Reg *d, Reg *s, int order)
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@ -527,7 +545,7 @@ void helper_shufps(Reg *d, Reg *s, int order)
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r.L(1) = d->L((order >> 2) & 3);
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r.L(2) = s->L((order >> 4) & 3);
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r.L(3) = s->L((order >> 6) & 3);
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*d = r;
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MOVE(*d, r);
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}
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void helper_shufpd(Reg *d, Reg *s, int order)
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@ -536,7 +554,7 @@ void helper_shufpd(Reg *d, Reg *s, int order)
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r.Q(0) = d->Q(order & 1);
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r.Q(1) = s->Q((order >> 1) & 1);
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_pshufd, SUFFIX)(Reg *d, Reg *s, int order)
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@ -547,7 +565,7 @@ void glue(helper_pshufd, SUFFIX)(Reg *d, Reg *s, int order)
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r.L(1) = s->L((order >> 2) & 3);
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r.L(2) = s->L((order >> 4) & 3);
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r.L(3) = s->L((order >> 6) & 3);
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_pshuflw, SUFFIX)(Reg *d, Reg *s, int order)
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@ -559,7 +577,7 @@ void glue(helper_pshuflw, SUFFIX)(Reg *d, Reg *s, int order)
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r.W(2) = s->W((order >> 4) & 3);
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r.W(3) = s->W((order >> 6) & 3);
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r.Q(1) = s->Q(1);
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_pshufhw, SUFFIX)(Reg *d, Reg *s, int order)
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@ -571,7 +589,7 @@ void glue(helper_pshufhw, SUFFIX)(Reg *d, Reg *s, int order)
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r.W(5) = s->W(4 + ((order >> 2) & 3));
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r.W(6) = s->W(4 + ((order >> 4) & 3));
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r.W(7) = s->W(4 + ((order >> 6) & 3));
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*d = r;
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MOVE(*d, r);
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}
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#endif
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@ -937,7 +955,7 @@ void helper_haddps(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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r.ZMM_S(1) = float32_add(d->ZMM_S(2), d->ZMM_S(3), &env->sse_status);
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r.ZMM_S(2) = float32_add(s->ZMM_S(0), s->ZMM_S(1), &env->sse_status);
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r.ZMM_S(3) = float32_add(s->ZMM_S(2), s->ZMM_S(3), &env->sse_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_haddpd(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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@ -946,7 +964,7 @@ void helper_haddpd(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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r.ZMM_D(0) = float64_add(d->ZMM_D(0), d->ZMM_D(1), &env->sse_status);
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r.ZMM_D(1) = float64_add(s->ZMM_D(0), s->ZMM_D(1), &env->sse_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_hsubps(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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@ -957,7 +975,7 @@ void helper_hsubps(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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r.ZMM_S(1) = float32_sub(d->ZMM_S(2), d->ZMM_S(3), &env->sse_status);
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r.ZMM_S(2) = float32_sub(s->ZMM_S(0), s->ZMM_S(1), &env->sse_status);
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r.ZMM_S(3) = float32_sub(s->ZMM_S(2), s->ZMM_S(3), &env->sse_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_hsubpd(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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@ -966,7 +984,7 @@ void helper_hsubpd(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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r.ZMM_D(0) = float64_sub(d->ZMM_D(0), d->ZMM_D(1), &env->sse_status);
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r.ZMM_D(1) = float64_sub(s->ZMM_D(0), s->ZMM_D(1), &env->sse_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_addsubps(CPUX86State *env, ZMMReg *d, ZMMReg *s)
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@ -1153,7 +1171,7 @@ void glue(helper_packsswb, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.B(14) = satsb((int16_t)s->W(6));
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r.B(15) = satsb((int16_t)s->W(7));
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#endif
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_packuswb, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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@ -1180,7 +1198,7 @@ void glue(helper_packuswb, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.B(14) = satub((int16_t)s->W(6));
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r.B(15) = satub((int16_t)s->W(7));
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#endif
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_packssdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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@ -1199,7 +1217,7 @@ void glue(helper_packssdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.W(6) = satsw(s->L(2));
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r.W(7) = satsw(s->L(3));
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#endif
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*d = r;
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MOVE(*d, r);
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}
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#define UNPCK_OP(base_name, base) \
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@ -1227,7 +1245,7 @@ void glue(helper_packssdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.B(14) = d->B((base << (SHIFT + 2)) + 7); \
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r.B(15) = s->B((base << (SHIFT + 2)) + 7); \
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) \
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*d = r; \
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MOVE(*d, r); \
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} \
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\
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void glue(helper_punpck ## base_name ## wd, SUFFIX)(CPUX86State *env,\
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@ -1245,7 +1263,7 @@ void glue(helper_packssdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.W(6) = d->W((base << (SHIFT + 1)) + 3); \
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r.W(7) = s->W((base << (SHIFT + 1)) + 3); \
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) \
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*d = r; \
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MOVE(*d, r); \
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} \
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\
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void glue(helper_punpck ## base_name ## dq, SUFFIX)(CPUX86State *env,\
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@ -1259,7 +1277,7 @@ void glue(helper_packssdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.L(2) = d->L((base << SHIFT) + 1); \
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r.L(3) = s->L((base << SHIFT) + 1); \
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) \
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*d = r; \
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MOVE(*d, r); \
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} \
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\
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XMM_ONLY( \
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@ -1272,7 +1290,7 @@ void glue(helper_packssdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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\
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r.Q(0) = d->Q(base); \
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r.Q(1) = s->Q(base); \
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*d = r; \
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MOVE(*d, r); \
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} \
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)
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@ -1313,7 +1331,7 @@ void helper_pfacc(CPUX86State *env, MMXReg *d, MMXReg *s)
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r.MMX_S(0) = float32_add(d->MMX_S(0), d->MMX_S(1), &env->mmx_status);
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r.MMX_S(1) = float32_add(s->MMX_S(0), s->MMX_S(1), &env->mmx_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_pfadd(CPUX86State *env, MMXReg *d, MMXReg *s)
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@ -1378,7 +1396,7 @@ void helper_pfnacc(CPUX86State *env, MMXReg *d, MMXReg *s)
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r.MMX_S(0) = float32_sub(d->MMX_S(0), d->MMX_S(1), &env->mmx_status);
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r.MMX_S(1) = float32_sub(s->MMX_S(0), s->MMX_S(1), &env->mmx_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_pfpnacc(CPUX86State *env, MMXReg *d, MMXReg *s)
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@ -1387,7 +1405,7 @@ void helper_pfpnacc(CPUX86State *env, MMXReg *d, MMXReg *s)
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r.MMX_S(0) = float32_sub(d->MMX_S(0), d->MMX_S(1), &env->mmx_status);
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r.MMX_S(1) = float32_add(s->MMX_S(0), s->MMX_S(1), &env->mmx_status);
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*d = r;
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MOVE(*d, r);
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}
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void helper_pfrcp(CPUX86State *env, MMXReg *d, MMXReg *s)
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@ -1424,7 +1442,7 @@ void helper_pswapd(CPUX86State *env, MMXReg *d, MMXReg *s)
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r.MMX_L(0) = s->MMX_L(1);
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r.MMX_L(1) = s->MMX_L(0);
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*d = r;
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MOVE(*d, r);
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}
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#endif
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@ -1438,7 +1456,7 @@ void glue(helper_pshufb, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.B(i) = (s->B(i) & 0x80) ? 0 : (d->B(s->B(i) & ((8 << SHIFT) - 1)));
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}
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_phaddw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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@ -1455,7 +1473,7 @@ void glue(helper_phaddw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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XMM_ONLY(r.W(6) = (int16_t)s->W(4) + (int16_t)s->W(5));
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XMM_ONLY(r.W(7) = (int16_t)s->W(6) + (int16_t)s->W(7));
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_phaddd, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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@ -1467,7 +1485,7 @@ void glue(helper_phaddd, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.L((1 << SHIFT) + 0) = (int32_t)s->L(0) + (int32_t)s->L(1);
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XMM_ONLY(r.L(3) = (int32_t)s->L(2) + (int32_t)s->L(3));
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_phaddsw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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@ -1483,7 +1501,7 @@ void glue(helper_phaddsw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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XMM_ONLY(r.W(6) = satsw((int16_t)s->W(4) + (int16_t)s->W(5)));
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XMM_ONLY(r.W(7) = satsw((int16_t)s->W(6) + (int16_t)s->W(7)));
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*d = r;
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MOVE(*d, r);
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}
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void glue(helper_pmaddubsw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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@ -1585,7 +1603,7 @@ void glue(helper_palignr, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
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#undef SHR
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}
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*d = r;
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MOVE(*d, r);
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}
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#define XMM0 (env->xmm_regs[0])
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@ -1718,7 +1736,7 @@ void glue(helper_packusdw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s)
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r.W(5) = satuw((int32_t) s->L(1));
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r.W(6) = satuw((int32_t) s->L(2));
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r.W(7) = satuw((int32_t) s->L(3));
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*d = r;
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MOVE(*d, r);
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}
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#define FMINSB(d, s) MIN((int8_t)d, (int8_t)s)
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@ -1984,7 +2002,7 @@ void glue(helper_mpsadbw, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
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r.W(i) += abs1(d->B(d0 + 3) - s->B(s0 + 3));
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}
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*d = r;
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MOVE(*d, r);
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}
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/* SSE4.2 op helpers */
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@ -2324,3 +2342,4 @@ void glue(helper_aeskeygenassist, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
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#undef L
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#undef Q
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#undef SUFFIX
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#undef SIZE
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