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-rw-r--r--arch/powerpc/math-emu/math_efp.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/powerpc/math-emu/math_efp.c b/arch/powerpc/math-emu/math_efp.c
index 59835c625dc6..ecdf35d8cb00 100644
--- a/arch/powerpc/math-emu/math_efp.c
+++ b/arch/powerpc/math-emu/math_efp.c
@@ -680,7 +680,8 @@ int speround_handler(struct pt_regs *regs)
{
union dw_union fgpr;
int s_lo, s_hi;
- unsigned long speinsn, type, fc;
+ int lo_inexact, hi_inexact;
+ unsigned long speinsn, type, fc, fptype;
if (get_user(speinsn, (unsigned int __user *) regs->nip))
return -EFAULT;
@@ -693,8 +694,12 @@ int speround_handler(struct pt_regs *regs)
__FPU_FPSCR = mfspr(SPRN_SPEFSCR);
pr_debug("speinsn:%08lx spefscr:%08lx\n", speinsn, __FPU_FPSCR);
+ fptype = (speinsn >> 5) & 0x7;
+
/* No need to round if the result is exact */
- if (!(__FPU_FPSCR & FP_EX_INEXACT))
+ lo_inexact = __FPU_FPSCR & (SPEFSCR_FG | SPEFSCR_FX);
+ hi_inexact = __FPU_FPSCR & (SPEFSCR_FGH | SPEFSCR_FXH);
+ if (!(lo_inexact || (hi_inexact && fptype == VCT)))
return 0;
fc = (speinsn >> 21) & 0x1f;
@@ -705,7 +710,7 @@ int speround_handler(struct pt_regs *regs)
pr_debug("round fgpr: %08x %08x\n", fgpr.wp[0], fgpr.wp[1]);
- switch ((speinsn >> 5) & 0x7) {
+ switch (fptype) {
/* Since SPE instructions on E500 core can handle round to nearest
* and round toward zero with IEEE-754 complied, we just need
* to handle round toward +Inf and round toward -Inf by software.
@@ -728,11 +733,15 @@ int speround_handler(struct pt_regs *regs)
case VCT:
if (FP_ROUNDMODE == FP_RND_PINF) {
- if (!s_lo) fgpr.wp[1]++; /* Z_low > 0, choose Z1 */
- if (!s_hi) fgpr.wp[0]++; /* Z_high word > 0, choose Z1 */
+ if (lo_inexact && !s_lo)
+ fgpr.wp[1]++; /* Z_low > 0, choose Z1 */
+ if (hi_inexact && !s_hi)
+ fgpr.wp[0]++; /* Z_high word > 0, choose Z1 */
} else { /* round to -Inf */
- if (s_lo) fgpr.wp[1]++; /* Z_low < 0, choose Z2 */
- if (s_hi) fgpr.wp[0]++; /* Z_high < 0, choose Z2 */
+ if (lo_inexact && s_lo)
+ fgpr.wp[1]++; /* Z_low < 0, choose Z2 */
+ if (hi_inexact && s_hi)
+ fgpr.wp[0]++; /* Z_high < 0, choose Z2 */
}
break;