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nir: Add support for 1-bit data types

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This commit adds support for 1-bit Booleans and integers.  Booleans
obviously take a value of true or false.  Because we have to define the
semantics of 1-bit signed and unsigned integers, we define uint1_t to
take values of 0 and 1 and int1_t to take values of 0 and -1.  1-bit
arithmetic is then well-defined in the usual way, just with fewer bits.
The definition of int1_t and uint1_t doesn't usually matter but we do
need something for purposes of constant folding.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Jason Ekstrand
2018-10-18 11:59:40 -05:00
committed by Jason Ekstrand
parent 2fe8708ffd
commit 3191a82372
11 changed files with 92 additions and 24 deletions
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12
src/compiler/nir/nir_builder.h
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@@ -332,7 +332,10 @@ nir_imm_intN_t(nir_builder *build, uint64_t x, unsigned bit_size)
memset(&v, 0, sizeof(v));
assert(bit_size <= 64);
v.i64[0] = x & (~0ull >> (64 - bit_size));
if (bit_size == 1)
v.b[0] = x & 1;
else
v.i64[0] = x & (~0ull >> (64 - bit_size));
return nir_build_imm(build, 1, bit_size, v);
}
@@ -351,6 +354,13 @@ nir_imm_ivec4(nir_builder *build, int x, int y, int z, int w)
return nir_build_imm(build, 4, 32, v);
}
static inline nir_ssa_def *
nir_imm_boolN_t(nir_builder *build, bool x, unsigned bit_size)
{
/* We use a 0/-1 convention for all booleans regardless of size */
return nir_imm_intN_t(build, -(int)x, bit_size);
}
static inline nir_ssa_def *
nir_build_alu(nir_builder *build, nir_op op, nir_ssa_def *src0,
nir_ssa_def *src1, nir_ssa_def *src2, nir_ssa_def *src3)