target-ppc: Add VSX ISA2.06 xdiv Instructions

This patch adds the VSX floating point divide instructions defined
by V2.06 of the PowerPC ISA: xsdivdp, xvdivdp, xvdivsp.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/fpu_helper.c

@@ -1855,3 +1855,52 @@ void helper_##op(CPUPPCState *env, uint32_t opcode)                          \
 VSX_MUL(xsmuldp, 1, float64, f64, 1)
 VSX_MUL(xvmuldp, 2, float64, f64, 0)
 VSX_MUL(xvmulsp, 4, float32, f32, 0)
+
+/* VSX_DIV - VSX floating point divide
+ *   op    - instruction mnemonic
+ *   nels  - number of elements (1, 2 or 4)
+ *   tp    - type (float32 or float64)
+ *   fld   - vsr_t field (f32 or f64)
+ *   sfprf - set FPRF
+ */
+#define VSX_DIV(op, nels, tp, fld, sfprf)                                     \
+void helper_##op(CPUPPCState *env, uint32_t opcode)                           \
+{                                                                             \
+    ppc_vsr_t xt, xa, xb;                                                     \
+    int i;                                                                    \
+                                                                              \
+    getVSR(xA(opcode), &xa, env);                                             \
+    getVSR(xB(opcode), &xb, env);                                             \
+    getVSR(xT(opcode), &xt, env);                                             \
+    helper_reset_fpstatus(env);                                               \
+                                                                              \
+    for (i = 0; i < nels; i++) {                                              \
+        float_status tstat = env->fp_status;                                  \
+        set_float_exception_flags(0, &tstat);                                 \
+        xt.fld[i] = tp##_div(xa.fld[i], xb.fld[i], &tstat);                   \
+        env->fp_status.float_exception_flags |= tstat.float_exception_flags;  \
+                                                                              \
+        if (unlikely(tstat.float_exception_flags & float_flag_invalid)) {     \
+            if (tp##_is_infinity(xa.fld[i]) && tp##_is_infinity(xb.fld[i])) { \
+                fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXIDI, sfprf);     \
+            } else if (tp##_is_zero(xa.fld[i]) &&                             \
+                tp##_is_zero(xb.fld[i])) {                                    \
+                fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXZDZ, sfprf);     \
+            } else if (tp##_is_signaling_nan(xa.fld[i]) ||                    \
+                tp##_is_signaling_nan(xb.fld[i])) {                           \
+                fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, sfprf);    \
+            }                                                                 \
+        }                                                                     \
+                                                                              \
+        if (sfprf) {                                                          \
+            helper_compute_fprf(env, xt.fld[i], sfprf);                       \
+        }                                                                     \
+    }                                                                         \
+                                                                              \
+    putVSR(xT(opcode), &xt, env);                                             \
+    helper_float_check_status(env);                                           \
+}
+
+VSX_DIV(xsdivdp, 1, float64, f64, 1)
+VSX_DIV(xvdivdp, 2, float64, f64, 0)
+VSX_DIV(xvdivsp, 4, float32, f32, 0)

target-ppc/helper.h

@@ -254,14 +254,17 @@ DEF_HELPER_4(vctsxs, void, env, avr, avr, i32)
 DEF_HELPER_2(xsadddp, void, env, i32)
 DEF_HELPER_2(xssubdp, void, env, i32)
 DEF_HELPER_2(xsmuldp, void, env, i32)
+DEF_HELPER_2(xsdivdp, void, env, i32)
 
 DEF_HELPER_2(xvadddp, void, env, i32)
 DEF_HELPER_2(xvsubdp, void, env, i32)
 DEF_HELPER_2(xvmuldp, void, env, i32)
+DEF_HELPER_2(xvdivdp, void, env, i32)
 
 DEF_HELPER_2(xvaddsp, void, env, i32)
 DEF_HELPER_2(xvsubsp, void, env, i32)
 DEF_HELPER_2(xvmulsp, void, env, i32)
+DEF_HELPER_2(xvdivsp, void, env, i32)
 
 DEF_HELPER_2(efscfsi, i32, env, i32)
 DEF_HELPER_2(efscfui, i32, env, i32)

target-ppc/translate.c

@@ -7307,14 +7307,17 @@ static void gen_##name(DisasContext * ctx)                                    \
 GEN_VSX_HELPER_2(xsadddp, 0x00, 0x04, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xssubdp, 0x00, 0x05, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xsmuldp, 0x00, 0x06, 0, PPC2_VSX)
+GEN_VSX_HELPER_2(xsdivdp, 0x00, 0x07, 0, PPC2_VSX)
 
 GEN_VSX_HELPER_2(xvadddp, 0x00, 0x0C, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvsubdp, 0x00, 0x0D, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvmuldp, 0x00, 0x0E, 0, PPC2_VSX)
+GEN_VSX_HELPER_2(xvdivdp, 0x00, 0x0F, 0, PPC2_VSX)
 
 GEN_VSX_HELPER_2(xvaddsp, 0x00, 0x08, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvsubsp, 0x00, 0x09, 0, PPC2_VSX)
 GEN_VSX_HELPER_2(xvmulsp, 0x00, 0x0A, 0, PPC2_VSX)
+GEN_VSX_HELPER_2(xvdivsp, 0x00, 0x0B, 0, PPC2_VSX)
 
 #define VSX_LOGICAL(name, tcg_op)                                    \
 static void glue(gen_, name)(DisasContext * ctx)                     \
@@ -10000,14 +10003,17 @@ GEN_XX3FORM(xvcpsgnsp, 0x00, 0x1A, PPC2_VSX),
 GEN_XX3FORM(xsadddp, 0x00, 0x04, PPC2_VSX),
 GEN_XX3FORM(xssubdp, 0x00, 0x05, PPC2_VSX),
 GEN_XX3FORM(xsmuldp, 0x00, 0x06, PPC2_VSX),
+GEN_XX3FORM(xsdivdp, 0x00, 0x07, PPC2_VSX),
 
 GEN_XX3FORM(xvadddp, 0x00, 0x0C, PPC2_VSX),
 GEN_XX3FORM(xvsubdp, 0x00, 0x0D, PPC2_VSX),
 GEN_XX3FORM(xvmuldp, 0x00, 0x0E, PPC2_VSX),
+GEN_XX3FORM(xvdivdp, 0x00, 0x0F, PPC2_VSX),
 
 GEN_XX3FORM(xvaddsp, 0x00, 0x08, PPC2_VSX),
 GEN_XX3FORM(xvsubsp, 0x00, 0x09, PPC2_VSX),
 GEN_XX3FORM(xvmulsp, 0x00, 0x0A, PPC2_VSX),
+GEN_XX3FORM(xvdivsp, 0x00, 0x0B, PPC2_VSX),
 
 #undef VSX_LOGICAL
 #define VSX_LOGICAL(name, opc2, opc3, fl2) \