target/ppc: Change VSX instructions behavior to fill with zeros

ISA v3.1 changed some VSX instructions behavior by changing what the
other words/doubleword in the result should contain when the result is
only one word/doubleword. e.g. xsmaxdp operates on doubleword 0 and
saves the result also in doubleword 0.
Before, the second doubleword result was undefined according to the
ISA, but now it's stated that it should be zeroed.

Even tough the result was undefined before, hardware implementing these
instructions already filled these fields with 0s. Changing every ISA
version in QEMU to this behavior makes the results match what happens
in hardware.

Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220204181944.65063-1-victor.colombo@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

2 files changed, 16 insertions, 14 deletions

diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index e5c29b53b8..bd76bee7f1 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -1696,7 +1696,7 @@ uint32_t helper_efdcmpeq(CPUPPCState *env, uint64_t op1, uint64_t op2)
 void helper_##name(CPUPPCState *env, ppc_vsr_t *xt,                          \
                    ppc_vsr_t *xa, ppc_vsr_t *xb)                             \
 {                                                                            \
-    ppc_vsr_t t = *xt;                                                       \
+    ppc_vsr_t t = { };                                                       \
     int i;                                                                   \
                                                                              \
     helper_reset_fpstatus(env);                                              \
@@ -1772,7 +1772,7 @@ void helper_xsaddqp(CPUPPCState *env, uint32_t opcode,
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt,                            \
                  ppc_vsr_t *xa, ppc_vsr_t *xb)                               \
 {                                                                            \
-    ppc_vsr_t t = *xt;                                                       \
+    ppc_vsr_t t = { };                                                       \
     int i;                                                                   \
                                                                              \
     helper_reset_fpstatus(env);                                              \
@@ -1843,7 +1843,7 @@ void helper_xsmulqp(CPUPPCState *env, uint32_t opcode,
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt,                             \
                  ppc_vsr_t *xa, ppc_vsr_t *xb)                                \
 {                                                                             \
-    ppc_vsr_t t = *xt;                                                        \
+    ppc_vsr_t t = { };                                                        \
     int i;                                                                    \
                                                                               \
     helper_reset_fpstatus(env);                                               \
@@ -1919,7 +1919,7 @@ void helper_xsdivqp(CPUPPCState *env, uint32_t opcode,
 #define VSX_RE(op, nels, tp, fld, sfprf, r2sp)                                \
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)              \
 {                                                                             \
-    ppc_vsr_t t = *xt;                                                        \
+    ppc_vsr_t t = { };                                                        \
     int i;                                                                    \
                                                                               \
     helper_reset_fpstatus(env);                                               \
@@ -1959,7 +1959,7 @@ VSX_RE(xvresp, 4, float32, VsrW(i), 0, 0)
 #define VSX_SQRT(op, nels, tp, fld, sfprf, r2sp)                             \
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)             \
 {                                                                            \
-    ppc_vsr_t t = *xt;                                                       \
+    ppc_vsr_t t = { };                                                       \
     int i;                                                                   \
                                                                              \
     helper_reset_fpstatus(env);                                              \
@@ -2004,7 +2004,7 @@ VSX_SQRT(xvsqrtsp, 4, float32, VsrW(i), 0, 0)
 #define VSX_RSQRTE(op, nels, tp, fld, sfprf, r2sp)                           \
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)             \
 {                                                                            \
-    ppc_vsr_t t = *xt;                                                       \
+    ppc_vsr_t t = { };                                                       \
     int i;                                                                   \
                                                                              \
     helper_reset_fpstatus(env);                                              \
@@ -2472,7 +2472,7 @@ void helper_xscmpuqp(CPUPPCState *env, uint32_t opcode, ppc_vsr_t *xa,
 void helper_##name(CPUPPCState *env, ppc_vsr_t *xt,                           \
                    ppc_vsr_t *xa, ppc_vsr_t *xb)                              \
 {                                                                             \
-    ppc_vsr_t t = *xt;                                                        \
+    ppc_vsr_t t = { };                                                        \
     int i;                                                                    \
                                                                               \
     for (i = 0; i < nels; i++) {                                              \
@@ -2498,7 +2498,7 @@ VSX_MAX_MIN(xvminsp, minnum, 4, float32, VsrW(i))
 void helper_##name(CPUPPCState *env,                                          \
                    ppc_vsr_t *xt, ppc_vsr_t *xa, ppc_vsr_t *xb)               \
 {                                                                             \
-    ppc_vsr_t t = *xt;                                                        \
+    ppc_vsr_t t = { };                                                        \
     bool vxsnan_flag = false, vex_flag = false;                               \
                                                                               \
     if (unlikely(float64_is_any_nan(xa->VsrD(0)) ||                           \
@@ -2533,7 +2533,7 @@ VSX_MAX_MINC(xsmincdp, 0);
 void helper_##name(CPUPPCState *env,                                          \
                    ppc_vsr_t *xt, ppc_vsr_t *xa, ppc_vsr_t *xb)               \
 {                                                                             \
-    ppc_vsr_t t = *xt;                                                        \
+    ppc_vsr_t t = { };                                                        \
     bool vxsnan_flag = false, vex_flag = false;                               \
                                                                               \
     if (unlikely(float64_is_any_nan(xa->VsrD(0)))) {                          \
@@ -2654,7 +2654,7 @@ VSX_CMP(xvcmpnesp, 4, float32, VsrW(i), eq, 0, 0)
 #define VSX_CVT_FP_TO_FP(op, nels, stp, ttp, sfld, tfld, sfprf)    \
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)   \
 {                                                                  \
-    ppc_vsr_t t = *xt;                                             \
+    ppc_vsr_t t = { };                                             \
     int i;                                                         \
                                                                    \
     for (i = 0; i < nels; i++) {                                   \
@@ -2833,7 +2833,7 @@ uint64_t helper_xscvspdpn(CPUPPCState *env, uint64_t xb)
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)             \
 {                                                                            \
     int all_flags = env->fp_status.float_exception_flags, flags;             \
-    ppc_vsr_t t = *xt;                                                       \
+    ppc_vsr_t t = { };                                                       \
     int i;                                                                   \
                                                                              \
     for (i = 0; i < nels; i++) {                                             \
@@ -2917,7 +2917,7 @@ VSX_CVT_FP_TO_INT_VECTOR(xscvqpuwz, float128, uint32, f128, VsrD(0), 0x0ULL)
 #define VSX_CVT_INT_TO_FP(op, nels, stp, ttp, sfld, tfld, sfprf, r2sp)  \
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)        \
 {                                                                       \
-    ppc_vsr_t t = *xt;                                                  \
+    ppc_vsr_t t = { };                                                  \
     int i;                                                              \
                                                                         \
     for (i = 0; i < nels; i++) {                                        \
@@ -2990,7 +2990,7 @@ VSX_CVT_INT_TO_FP_VECTOR(xscvudqp, uint64, float128, VsrD(0), f128)
 #define VSX_ROUND(op, nels, tp, fld, rmode, sfprf)                     \
 void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)       \
 {                                                                      \
-    ppc_vsr_t t = *xt;                                                 \
+    ppc_vsr_t t = { };                                                 \
     int i;                                                             \
     FloatRoundMode curr_rounding_mode;                                 \
                                                                        \
diff --git a/target/ppc/translate/vsx-impl.c.inc b/target/ppc/translate/vsx-impl.c.inc
index c636e38164..128968b5e7 100644
--- a/target/ppc/translate/vsx-impl.c.inc
+++ b/target/ppc/translate/vsx-impl.c.inc
@@ -747,6 +747,7 @@ static void glue(gen_, name)(DisasContext *ctx)                   \
             }                                                     \
         }                                                         \
         set_cpu_vsr(xT(ctx->opcode), xb, true);                   \
+        set_cpu_vsr(xT(ctx->opcode), tcg_constant_i64(0), false); \
         tcg_temp_free_i64(xb);                                    \
         tcg_temp_free_i64(sgm);                                   \
     }
@@ -1073,6 +1074,7 @@ static void gen_##name(DisasContext *ctx)                     \
     get_cpu_vsr(t0, xB(ctx->opcode), true);                   \
     gen_helper_##name(t1, cpu_env, t0);                       \
     set_cpu_vsr(xT(ctx->opcode), t1, true);                   \
+    set_cpu_vsr(xT(ctx->opcode), tcg_constant_i64(0), false); \
     tcg_temp_free_i64(t0);                                    \
     tcg_temp_free_i64(t1);                                    \
 }
@@ -1700,7 +1702,7 @@ static void gen_xsiexpdp(DisasContext *ctx)
     tcg_gen_shli_i64(t0, t0, 52);
     tcg_gen_or_i64(xth, xth, t0);
     set_cpu_vsr(xT(ctx->opcode), xth, true);
-    /* dword[1] is undefined */
+    set_cpu_vsr(xT(ctx->opcode), tcg_constant_i64(0), false);
     tcg_temp_free_i64(t0);
     tcg_temp_free_i64(xth);
 }