diff options
Diffstat (limited to 'target-ppc/fpu_helper.c')
| -rw-r--r-- | target-ppc/fpu_helper.c | 56 |
1 files changed, 46 insertions, 10 deletions
diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c index 87ff60fc62..772b135600 100644 --- a/target-ppc/fpu_helper.c +++ b/target-ppc/fpu_helper.c @@ -50,6 +50,16 @@ static inline int isden(float64 d) return ((u.ll >> 52) & 0x7FF) == 0; } +static inline int ppc_float32_get_unbiased_exp(float32 f) +{ + return ((f >> 23) & 0xFF) - 127; +} + +static inline int ppc_float64_get_unbiased_exp(float64 f) +{ + return ((f >> 52) & 0x7FF) - 1023; +} + uint32_t helper_compute_fprf(CPUPPCState *env, uint64_t arg, uint32_t set_fprf) { CPU_DoubleU farg; @@ -993,6 +1003,42 @@ uint64_t helper_fsel(CPUPPCState *env, uint64_t arg1, uint64_t arg2, } } +uint32_t helper_ftdiv(uint64_t fra, uint64_t frb) +{ + int fe_flag = 0; + int fg_flag = 0; + + if (unlikely(float64_is_infinity(fra) || + float64_is_infinity(frb) || + float64_is_zero(frb))) { + fe_flag = 1; + fg_flag = 1; + } else { + int e_a = ppc_float64_get_unbiased_exp(fra); + int e_b = ppc_float64_get_unbiased_exp(frb); + + if (unlikely(float64_is_any_nan(fra) || + float64_is_any_nan(frb))) { + fe_flag = 1; + } else if ((e_b <= -1022) || (e_b >= 1021)) { + fe_flag = 1; + } else if (!float64_is_zero(fra) && + (((e_a - e_b) >= 1023) || + ((e_a - e_b) <= -1021) || + (e_a <= -970))) { + fe_flag = 1; + } + + if (unlikely(float64_is_zero_or_denormal(frb))) { + /* XB is not zero because of the above check and */ + /* so must be denormalized. */ + fg_flag = 1; + } + } + + return 0x8 | (fg_flag ? 4 : 0) | (fe_flag ? 2 : 0); +} + void helper_fcmpu(CPUPPCState *env, uint64_t arg1, uint64_t arg2, uint32_t crfD) { @@ -2021,16 +2067,6 @@ VSX_RSQRTE(xsrsqrtesp, 1, float64, f64, 1, 1) VSX_RSQRTE(xvrsqrtedp, 2, float64, f64, 0, 0) VSX_RSQRTE(xvrsqrtesp, 4, float32, f32, 0, 0) -static inline int ppc_float32_get_unbiased_exp(float32 f) -{ - return ((f >> 23) & 0xFF) - 127; -} - -static inline int ppc_float64_get_unbiased_exp(float64 f) -{ - return ((f >> 52) & 0x7FF) - 1023; -} - /* VSX_TDIV - VSX floating point test for divide * op - instruction mnemonic * nels - number of elements (1, 2 or 4) |