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Dyncom/VFP: Convert denormal outputs into 0 when the FTZ flag is enabled.

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Inputs are still not flushed to 0 if they are denormals.
This commit is contained in:
Subv 2017-05-08 14:34:16 -05:00
parent e33558c6ce
commit b1a29371c9
2 changed files with 30 additions and 0 deletions
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15
src/core/arm/skyeye_common/vfp/vfpdouble.cpp
View File

@ -135,6 +135,21 @@ u32 vfp_double_normaliseround(ARMul_State* state, int dd, struct vfp_double* vd,
#endif
if (!(significand & ((1ULL << (VFP_DOUBLE_LOW_BITS + 1)) - 1)))
underflow = 0;
int type = vfp_double_type(vd);
if ((type & VFP_DENORMAL) && (fpscr & FPSCR_FLUSH_TO_ZERO)) {
// Flush denormal to positive 0
exponent = 0;
significand = 0;
vd->sign = 0;
vd->exponent = exponent;
vd->significand = significand;
underflow = 0;
exceptions |= FPSCR_UFC;
}
}
/*

15
src/core/arm/skyeye_common/vfp/vfpsingle.cpp
View File

@ -138,6 +138,21 @@ u32 vfp_single_normaliseround(ARMul_State* state, int sd, struct vfp_single* vs,
#endif
if (!(significand & ((1 << (VFP_SINGLE_LOW_BITS + 1)) - 1)))
underflow = 0;
int type = vfp_single_type(vs);
if ((type & VFP_DENORMAL) && (fpscr & FPSCR_FLUSH_TO_ZERO)) {
// Flush denormal to positive 0
exponent = 0;
significand = 0;
vs->sign = 0;
vs->exponent = exponent;
vs->significand = significand;
underflow = 0;
exceptions |= FPSCR_UFC;
}
}
/*