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authorLiu Yu <yu.liu@freescale.com>2011-09-05 17:01:22 +0800
committerKumar Gala <galak@kernel.crashing.org>2011-10-06 23:36:44 -0500
commitd5755e6f3a412f012377e28b655d89eff3311f1c (patch)
tree5e0cf2e457508c34bee70418d05b3cebcdb9c686 /arch/powerpc/math-emu
parentb430abc4d10537992a5ba38eff6c46b3c9009a19 (diff)
downloadlinaro-lsk-d5755e6f3a412f012377e28b655d89eff3311f1c.tar.gz
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>
Diffstat (limited to 'arch/powerpc/math-emu')
-rw-r--r--arch/powerpc/math-emu/math_efp.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/math-emu/math_efp.c b/arch/powerpc/math-emu/math_efp.c
index 10fda0f13a0..96dbbae1a59 100644
--- a/arch/powerpc/math-emu/math_efp.c
+++ b/arch/powerpc/math-emu/math_efp.c
@@ -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;
}