MIPS: math-emu: Add support for the MIPS R6 RINT FPU instruction

MIPS R6 introduced the following instruction:
Floating-Point Round to Integral
Scalar floating-point round to integral floating point value.

RINT.fmt: FPR[fd] = round_int(FPR[fs])

Signed-off-by: Markos Chandras <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/10958/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/math-emu/cp1emu.c

···
 			break;
 		}
 
+		case frint_op: {
+			union ieee754sp fs;
+
+			if (!cpu_has_mips_r6)
+				return SIGILL;
+
+			SPFROMREG(fs, MIPSInst_FS(ir));
+			rv.l = ieee754sp_tlong(fs);
+			rv.s = ieee754sp_flong(rv.l);
+			goto copcsr;
+		}
+
 		case fabs_op:
 			handler.u = ieee754sp_abs;
 			goto scopuop;
···
 			DPFROMREG(fd, MIPSInst_FD(ir));
 			rv.d = ieee754dp_msubf(fd, fs, ft);
 			break;
+		}
+
+		case frint_op: {
+			union ieee754dp fs;
+
+			if (!cpu_has_mips_r6)
+				return SIGILL;
+
+			DPFROMREG(fs, MIPSInst_FS(ir));
+			rv.l = ieee754dp_tlong(fs);
+			rv.d = ieee754dp_flong(rv.l);
+			goto copcsr;
 		}
 
 		case fabs_op: