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pan/bit: Add FREXP interp support

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4615>
This commit is contained in:
Alyssa Rosenzweig 2020-04-14 12:50:48 -04:00
parent c05860789a
commit 36cfe722e5
1 changed files with 34 additions and 1 deletions
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35
src/panfrost/bifrost/test/bi_interpret.c
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@ -340,6 +340,28 @@ bit_as_int16(nir_alu_type T, bit_t src, unsigned C, enum bifrost_roundmode rm)
}
}
static float
frexp_log(float x, int *e)
{
/* Ignore sign until end */
float xa = fabs(x);
/* frexp reduces to [0.5, 1) */
float f = frexpf(xa, e);
/* reduce to [0.75, 1.5) */
if (f < 0.75) {
f *= 2.0;
(*e)--;
}
/* Reattach sign */
if (xa < 0.0)
f = -f;
return f;
}
void
bit_step(struct bit_state *s, bi_instruction *ins, bool FMA)
{
@ -424,7 +446,18 @@ bit_step(struct bit_state *s, bi_instruction *ins, bool FMA)
unreachable("Unknown type");
}
case BI_FREXP:
case BI_FREXP: {
if (ins->src_types[0] != nir_type_float32)
unreachable("Unknown frexp type");
if (ins->op.frexp == BI_FREXPE_LOG)
frexp_log(srcs[0].f32, &dest.i32);
else
unreachable("Unknown frexp");
break;
}
case BI_ISUB:
unreachable("Unsupported op");