target-ppc: emulate fcpsgn instruction

Needed for Power ISA version 2.05 compliance.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-ppc/translate.c

@@ -2258,6 +2258,19 @@ static void gen_fneg(DisasContext *ctx)
     gen_compute_fprf(cpu_fpr[rD(ctx->opcode)], 0, Rc(ctx->opcode) != 0);
 }
 
+/* fcpsgn: PowerPC 2.05 specification */
+/* XXX: beware that fcpsgn never checks for NaNs nor update FPSCR */
+static void gen_fcpsgn(DisasContext *ctx)
+{
+    if (unlikely(!ctx->fpu_enabled)) {
+        gen_exception(ctx, POWERPC_EXCP_FPU);
+        return;
+    }
+    tcg_gen_deposit_i64(cpu_fpr[rD(ctx->opcode)], cpu_fpr[rA(ctx->opcode)],
+                        cpu_fpr[rB(ctx->opcode)], 0, 63);
+    gen_compute_fprf(cpu_fpr[rD(ctx->opcode)], 0, Rc(ctx->opcode) != 0);
+}
+
 /***                  Floating-Point status & ctrl register                ***/
 
 /* mcrfs */
@@ -8559,6 +8572,7 @@ GEN_HANDLER(fabs, 0x3F, 0x08, 0x08, 0x001F0000, PPC_FLOAT),
 GEN_HANDLER(fmr, 0x3F, 0x08, 0x02, 0x001F0000, PPC_FLOAT),
 GEN_HANDLER(fnabs, 0x3F, 0x08, 0x04, 0x001F0000, PPC_FLOAT),
 GEN_HANDLER(fneg, 0x3F, 0x08, 0x01, 0x001F0000, PPC_FLOAT),
+GEN_HANDLER_E(fcpsgn, 0x3F, 0x08, 0x00, 0x00000000, PPC_NONE, PPC2_ISA205),
 GEN_HANDLER(mcrfs, 0x3F, 0x00, 0x02, 0x0063F801, PPC_FLOAT),
 GEN_HANDLER(mffs, 0x3F, 0x07, 0x12, 0x001FF800, PPC_FLOAT),
 GEN_HANDLER(mtfsb0, 0x3F, 0x06, 0x02, 0x001FF800, PPC_FLOAT),