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nir/builder: add nir_mask

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it's handy to have functions for generating masks

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10620>
This commit is contained in:
Mike Blumenkrantz 2021-05-04 10:24:03 -04:00 • committed by Marge Bot
parent 360f1032d2
commit f9ecbb1e1d
1 changed files with 8 additions and 0 deletions
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8
src/compiler/nir/nir_builder.h
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@ -1612,6 +1612,14 @@ nir_build_calc_io_offset(nir_builder *b,
return nir_iadd_imm_nuw(b, nir_iadd_nuw(b, base_op, offset_op), const_op);
}
/* calculate a `(1 << value) - 1` in ssa without overflows */
static inline nir_ssa_def *
nir_mask(nir_builder *b, nir_ssa_def *bits, unsigned dst_bit_size)
{
return nir_ushr(b, nir_imm_intN_t(b, -1, dst_bit_size),
nir_isub_imm(b, dst_bit_size, nir_u2u32(b, bits)));
}
static inline nir_ssa_def *
nir_f2b(nir_builder *build, nir_ssa_def *f)
{