int vis_emul()

in kernel/visemul.c [804:899]
74 lines of code
41 McCabe index (conditional complexity)

int vis_emul(struct pt_regs *regs, unsigned int insn)
{
	unsigned long pc = regs->tpc;
	unsigned int opf;

	BUG_ON(regs->tstate & TSTATE_PRIV);

	perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);

	if (test_thread_flag(TIF_32BIT))
		pc = (u32)pc;

	if (get_user(insn, (u32 __user *) pc))
		return -EFAULT;

	save_and_clear_fpu();

	opf = (insn & VIS_OPF_MASK) >> VIS_OPF_SHIFT;
	switch (opf) {
	default:
		return -EINVAL;

	/* Pixel Formatting Instructions.  */
	case FPACK16_OPF:
	case FPACK32_OPF:
	case FPACKFIX_OPF:
	case FEXPAND_OPF:
	case FPMERGE_OPF:
		pformat(regs, insn, opf);
		break;

	/* Partitioned Multiply Instructions  */
	case FMUL8x16_OPF:
	case FMUL8x16AU_OPF:
	case FMUL8x16AL_OPF:
	case FMUL8SUx16_OPF:
	case FMUL8ULx16_OPF:
	case FMULD8SUx16_OPF:
	case FMULD8ULx16_OPF:
		pmul(regs, insn, opf);
		break;

	/* Pixel Compare Instructions  */
	case FCMPGT16_OPF:
	case FCMPGT32_OPF:
	case FCMPLE16_OPF:
	case FCMPLE32_OPF:
	case FCMPNE16_OPF:
	case FCMPNE32_OPF:
	case FCMPEQ16_OPF:
	case FCMPEQ32_OPF:
		pcmp(regs, insn, opf);
		break;

	/* Edge Handling Instructions  */
	case EDGE8_OPF:
	case EDGE8N_OPF:
	case EDGE8L_OPF:
	case EDGE8LN_OPF:
	case EDGE16_OPF:
	case EDGE16N_OPF:
	case EDGE16L_OPF:
	case EDGE16LN_OPF:
	case EDGE32_OPF:
	case EDGE32N_OPF:
	case EDGE32L_OPF:
	case EDGE32LN_OPF:
		edge(regs, insn, opf);
		break;

	/* Pixel Component Distance  */
	case PDIST_OPF:
		pdist(regs, insn);
		break;

	/* Three-Dimensional Array Addressing Instructions  */
	case ARRAY8_OPF:
	case ARRAY16_OPF:
	case ARRAY32_OPF:
		array(regs, insn, opf);
		break;

	/* Byte Mask and Shuffle Instructions  */
	case BMASK_OPF:
		bmask(regs, insn);
		break;

	case BSHUFFLE_OPF:
		bshuffle(regs, insn);
		break;
	}

	regs->tpc = regs->tnpc;
	regs->tnpc += 4;
	return 0;
}