[PULL 02/15] target/ppc: Implemented vector divide quadword

[Daniel Henrique Barboza <danielhb413@gmail.com>]

From: "Lucas Mateus Castro (alqotel)" <lucas.araujo@eldorado.org.br>

Implement the following PowerISA v3.1 instructions:
vdivsq: Vector Divide Signed Quadword
vdivuq: Vector Divide Unsigned Quadword

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-3-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 target/ppc/helper.h                 |  2 ++
 target/ppc/insn32.decode            |  2 ++
 target/ppc/int_helper.c             | 21 +++++++++++++++++++++
 target/ppc/translate/vmx-impl.c.inc |  2 ++
 4 files changed, 27 insertions(+)

diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 6233e28d85..9f33e589e0 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -175,6 +175,8 @@ DEF_HELPER_FLAGS_3(VMULOSW, TCG_CALL_NO_RWG, void, avr, avr, avr)
 DEF_HELPER_FLAGS_3(VMULOUB, TCG_CALL_NO_RWG, void, avr, avr, avr)
 DEF_HELPER_FLAGS_3(VMULOUH, TCG_CALL_NO_RWG, void, avr, avr, avr)
 DEF_HELPER_FLAGS_3(VMULOUW, TCG_CALL_NO_RWG, void, avr, avr, avr)
+DEF_HELPER_FLAGS_3(VDIVSQ, TCG_CALL_NO_RWG, void, avr, avr, avr)
+DEF_HELPER_FLAGS_3(VDIVUQ, TCG_CALL_NO_RWG, void, avr, avr, avr)
 DEF_HELPER_FLAGS_3(vslo, TCG_CALL_NO_RWG, void, avr, avr, avr)
 DEF_HELPER_FLAGS_3(vsro, TCG_CALL_NO_RWG, void, avr, avr, avr)
 DEF_HELPER_FLAGS_3(vsrv, TCG_CALL_NO_RWG, void, avr, avr, avr)
diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index 6df405e398..01bfde8c5e 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -793,3 +793,5 @@ VDIVSW          000100 ..... ..... ..... 00110001011    @VX
 VDIVUW          000100 ..... ..... ..... 00010001011    @VX
 VDIVSD          000100 ..... ..... ..... 00111001011    @VX
 VDIVUD          000100 ..... ..... ..... 00011001011    @VX
+VDIVSQ          000100 ..... ..... ..... 00100001011    @VX
+VDIVUQ          000100 ..... ..... ..... 00000001011    @VX
diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 105b626d1b..033718dc0e 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -1162,6 +1162,27 @@ void helper_XXPERMX(ppc_vsr_t *t, ppc_vsr_t *s0, ppc_vsr_t *s1, ppc_vsr_t *pcv,
     *t = tmp;
 }
 
+void helper_VDIVSQ(ppc_avr_t *t, ppc_avr_t *a, ppc_avr_t *b)
+{
+    Int128 neg1 = int128_makes64(-1);
+    Int128 int128_min = int128_make128(0, INT64_MIN);
+    if (likely(int128_nz(b->s128) &&
+              (int128_ne(a->s128, int128_min) || int128_ne(b->s128, neg1)))) {
+        t->s128 = int128_divs(a->s128, b->s128);
+    } else {
+        t->s128 = a->s128; /* Undefined behavior */
+    }
+}
+
+void helper_VDIVUQ(ppc_avr_t *t, ppc_avr_t *a, ppc_avr_t *b)
+{
+    if (int128_nz(b->s128)) {
+        t->s128 = int128_divu(a->s128, b->s128);
+    } else {
+        t->s128 = a->s128; /* Undefined behavior */
+    }
+}
+
 void helper_VPERM(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, ppc_avr_t *c)
 {
     ppc_avr_t result;
diff --git a/target/ppc/translate/vmx-impl.c.inc b/target/ppc/translate/vmx-impl.c.inc
index 4c0b1a32ec..22572e6a79 100644
--- a/target/ppc/translate/vmx-impl.c.inc
+++ b/target/ppc/translate/vmx-impl.c.inc
@@ -3317,6 +3317,8 @@ TRANS_FLAGS2(ISA310, VDIVSW, do_vdiv_vmod, MO_32, do_divsw, NULL)
 TRANS_FLAGS2(ISA310, VDIVUW, do_vdiv_vmod, MO_32, do_divuw, NULL)
 TRANS_FLAGS2(ISA310, VDIVSD, do_vdiv_vmod, MO_64, NULL, do_divsd)
 TRANS_FLAGS2(ISA310, VDIVUD, do_vdiv_vmod, MO_64, NULL, do_divud)
+TRANS_FLAGS2(ISA310, VDIVSQ, do_vx_helper, gen_helper_VDIVSQ)
+TRANS_FLAGS2(ISA310, VDIVUQ, do_vx_helper, gen_helper_VDIVUQ)
 
 #undef DIVS32
 #undef DIVU32
-- 
2.36.1