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Commit d5755e6f authored by Liu Yu's avatar Liu Yu Committed by Kumar Gala
Browse files

powerpc/math_emu/efp: No need to round if the result is exact 



Signed-off-by: default avatarLiu Yu <yu.liu@freescale.com>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent b430abc4

arch/powerpc/math-emu/math_efp.c

+10 −1
Original line number Diff line number Diff line
@@ -676,13 +676,20 @@ int speround_handler(struct pt_regs *regs) 
	type = insn_type(speinsn & 0x7ff);

	if (type == XCR) return -ENOSYS;



	__FPU_FPSCR = mfspr(SPRN_SPEFSCR);

	pr_debug("speinsn:%08lx spefscr:%08lx\n", speinsn, __FPU_FPSCR);



	/* No need to round if the result is exact */

	if (!(__FPU_FPSCR & FP_EX_INEXACT))

		return 0;



	fc = (speinsn >> 21) & 0x1f;

	s_lo = regs->gpr[fc] & SIGN_BIT_S;

	s_hi = current->thread.evr[fc] & SIGN_BIT_S;

	fgpr.wp[0] = current->thread.evr[fc];

	fgpr.wp[1] = regs->gpr[fc];



	__FPU_FPSCR = mfspr(SPRN_SPEFSCR);

	pr_debug("round fgpr: %08x  %08x\n", fgpr.wp[0], fgpr.wp[1]);



	switch ((speinsn >> 5) & 0x7) {

	/* Since SPE instructions on E500 core can handle round to nearest
@@ -722,6 +729,8 @@ int speround_handler(struct pt_regs *regs) 
	current->thread.evr[fc] = fgpr.wp[0];

	regs->gpr[fc] = fgpr.wp[1];



	pr_debug("  to fgpr: %08x  %08x\n", fgpr.wp[0], fgpr.wp[1]);



	return 0;

}