diff options
Diffstat (limited to 'target-alpha/fpu_helper.c')
| -rw-r--r-- | target-alpha/fpu_helper.c | 44 |
1 files changed, 10 insertions, 34 deletions
diff --git a/target-alpha/fpu_helper.c b/target-alpha/fpu_helper.c index d38521b..dda1103 100644 --- a/target-alpha/fpu_helper.c +++ b/target-alpha/fpu_helper.c @@ -88,21 +88,17 @@ void helper_fp_exc_raise_s(CPUAlphaState *env, uint32_t exc, uint32_t regno) } } -/* Input remapping without software completion. Handle denormal-map-to-zero - and trap for all other non-finite numbers. */ -uint64_t helper_ieee_input(CPUAlphaState *env, uint64_t val) +/* Input handing without software completion. Trap for all + non-finite numbers. */ +void helper_ieee_input(CPUAlphaState *env, uint64_t val) { uint32_t exp = (uint32_t)(val >> 52) & 0x7ff; uint64_t frac = val & 0xfffffffffffffull; if (exp == 0) { - if (frac != 0) { - /* If DNZ is set flush denormals to zero on input. */ - if (env->fpcr_dnz) { - val &= 1ull << 63; - } else { - arith_excp(env, GETPC(), EXC_M_UNF, 0); - } + /* Denormals without DNZ set raise an exception. */ + if (frac != 0 && !env->fp_status.flush_inputs_to_zero) { + arith_excp(env, GETPC(), EXC_M_UNF, 0); } } else if (exp == 0x7ff) { /* Infinity or NaN. */ @@ -111,43 +107,23 @@ uint64_t helper_ieee_input(CPUAlphaState *env, uint64_t val) just emulates the insn to figure out what exception to use. */ arith_excp(env, GETPC(), frac ? EXC_M_INV : EXC_M_FOV, 0); } - return val; } /* Similar, but does not trap for infinities. Used for comparisons. */ -uint64_t helper_ieee_input_cmp(CPUAlphaState *env, uint64_t val) +void helper_ieee_input_cmp(CPUAlphaState *env, uint64_t val) { uint32_t exp = (uint32_t)(val >> 52) & 0x7ff; uint64_t frac = val & 0xfffffffffffffull; if (exp == 0) { - if (frac != 0) { - /* If DNZ is set flush denormals to zero on input. */ - if (env->fpcr_dnz) { - val &= 1ull << 63; - } else { - arith_excp(env, GETPC(), EXC_M_UNF, 0); - } + /* Denormals without DNZ set raise an exception. */ + if (frac != 0 && !env->fp_status.flush_inputs_to_zero) { + arith_excp(env, GETPC(), EXC_M_UNF, 0); } } else if (exp == 0x7ff && frac) { /* NaN. */ arith_excp(env, GETPC(), EXC_M_INV, 0); } - return val; -} - -/* Input remapping with software completion enabled. All we have to do - is handle denormal-map-to-zero; all other inputs get exceptions as - needed from the actual operation. */ -uint64_t helper_ieee_input_s(CPUAlphaState *env, uint64_t val) -{ - if (env->fpcr_dnz) { - uint32_t exp = (uint32_t)(val >> 52) & 0x7ff; - if (exp == 0) { - val &= 1ull << 63; - } - } - return val; } /* F floating (VAX) */ |