MIPS: math-emu: Add support for the MIPS R6 SELEQZ FPU instruction
authorMarkos Chandras <markos.chandras@imgtec.com>
Thu, 13 Aug 2015 07:56:29 +0000 (09:56 +0200)
committerRalf Baechle <ralf@linux-mips.org>
Thu, 3 Sep 2015 10:08:12 +0000 (12:08 +0200)
MIPS R6 introduced the following instruction:
SELEQZ.fmt: FPR[fd] ´éČ FPR[ft].bit0 ? 0 : FPR[fs]

Add support for emulating the single and double precision formats
of the said instruction.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10954/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/math-emu/cp1emu.c

index ef41fc8..02ba536 100644 (file)
@@ -1743,6 +1743,17 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
                        SPFROMREG(rv.s, MIPSInst_FS(ir));
                        break;
 
+               case fseleqz_op:
+                       if (!cpu_has_mips_r6)
+                               return SIGILL;
+
+                       SPFROMREG(rv.s, MIPSInst_FT(ir));
+                       if (rv.w & 0x1)
+                               rv.w = 0;
+                       else
+                               SPFROMREG(rv.s, MIPSInst_FS(ir));
+                       break;
+
                case fabs_op:
                        handler.u = ieee754sp_abs;
                        goto scopuop;
@@ -1940,6 +1951,18 @@ copcsr:
                                return 0;
                        DPFROMREG(rv.d, MIPSInst_FS(ir));
                        break;
+
+               case fseleqz_op:
+                       if (!cpu_has_mips_r6)
+                               return SIGILL;
+
+                       DPFROMREG(rv.d, MIPSInst_FT(ir));
+                       if (rv.l & 0x1)
+                               rv.l = 0;
+                       else
+                               DPFROMREG(rv.d, MIPSInst_FS(ir));
+                       break;
+
                case fabs_op:
                        handler.u = ieee754dp_abs;
                        goto dcopuop;