diff options
| -rw-r--r-- | target/ppc/fpu_helper.c | 78 |
1 files changed, 22 insertions, 56 deletions
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c index a66e16c212..03150a0f10 100644 --- a/target/ppc/fpu_helper.c +++ b/target/ppc/fpu_helper.c @@ -141,62 +141,28 @@ static inline int ppc_float64_get_unbiased_exp(float64 f) return ((f >> 52) & 0x7FF) - 1023; } -/* Classify a floating-point number. */ -enum { - is_normal = 1, - is_zero = 2, - is_denormal = 4, - is_inf = 8, - is_qnan = 16, - is_snan = 32, - is_neg = 64, -}; - -#define COMPUTE_CLASS(tp) \ -static int tp##_classify(tp arg) \ -{ \ - int ret = tp##_is_neg(arg) * is_neg; \ - if (unlikely(tp##_is_any_nan(arg))) { \ - float_status dummy = { }; /* snan_bit_is_one = 0 */ \ - ret |= (tp##_is_signaling_nan(arg, &dummy) \ - ? is_snan : is_qnan); \ - } else if (unlikely(tp##_is_infinity(arg))) { \ - ret |= is_inf; \ - } else if (tp##_is_zero(arg)) { \ - ret |= is_zero; \ - } else if (tp##_is_zero_or_denormal(arg)) { \ - ret |= is_denormal; \ - } else { \ - ret |= is_normal; \ - } \ - return ret; \ -} - -COMPUTE_CLASS(float16) -COMPUTE_CLASS(float32) -COMPUTE_CLASS(float64) -COMPUTE_CLASS(float128) - -static void set_fprf_from_class(CPUPPCState *env, int class) -{ - static const uint8_t fprf[6][2] = { - { 0x04, 0x08 }, /* normalized */ - { 0x02, 0x12 }, /* zero */ - { 0x14, 0x18 }, /* denormalized */ - { 0x05, 0x09 }, /* infinity */ - { 0x11, 0x11 }, /* qnan */ - { 0x00, 0x00 }, /* snan -- flags are undefined */ - }; - bool isneg = class & is_neg; - - env->fpscr &= ~FP_FPRF; - env->fpscr |= fprf[ctz32(class)][isneg] << FPSCR_FPRF; -} - -#define COMPUTE_FPRF(tp) \ -void helper_compute_fprf_##tp(CPUPPCState *env, tp arg) \ -{ \ - set_fprf_from_class(env, tp##_classify(arg)); \ +#define COMPUTE_FPRF(tp) \ +void helper_compute_fprf_##tp(CPUPPCState *env, tp arg) \ +{ \ + bool neg = tp##_is_neg(arg); \ + target_ulong fprf; \ + if (likely(tp##_is_normal(arg))) { \ + fprf = neg ? 0x08 << FPSCR_FPRF : 0x04 << FPSCR_FPRF; \ + } else if (tp##_is_zero(arg)) { \ + fprf = neg ? 0x12 << FPSCR_FPRF : 0x02 << FPSCR_FPRF; \ + } else if (tp##_is_zero_or_denormal(arg)) { \ + fprf = neg ? 0x18 << FPSCR_FPRF : 0x14 << FPSCR_FPRF; \ + } else if (tp##_is_infinity(arg)) { \ + fprf = neg ? 0x09 << FPSCR_FPRF : 0x05 << FPSCR_FPRF; \ + } else { \ + float_status dummy = { }; /* snan_bit_is_one = 0 */ \ + if (tp##_is_signaling_nan(arg, &dummy)) { \ + fprf = 0x00 << FPSCR_FPRF; \ + } else { \ + fprf = 0x11 << FPSCR_FPRF; \ + } \ + } \ + env->fpscr = (env->fpscr & ~FP_FPRF) | fprf; \ } COMPUTE_FPRF(float16) |