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

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Liu Yu 2011-09-05 17:01:22 +08:00 committed by Kumar Gala
parent b430abc4d1
commit d5755e6f3a
1 changed files with 10 additions and 1 deletions
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11
arch/powerpc/math-emu/math_efp.c
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@ -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;
}