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nir: Lower packing and unpacking of 64-bit integer types

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This change makes me wonder whether double packing should be
reimplemented as int64BitsToDouble(packInt2x32(v)).  I'm a little on the
fence since not all platforms that support fp64 natively support int64.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Ian Romanick
2016-09-02 08:09:53 -07:00
parent 3460d05a71
commit 8ad74a2745
1 changed files with 37 additions and 5 deletions
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42
src/compiler/nir/nir_lower_double_packing.c
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@@ -30,6 +30,8 @@
*
* packDouble2x32(foo) -> packDouble2x32Split(foo.x, foo.y)
* unpackDouble2x32(foo) -> vec2(unpackDouble2x32_x(foo), unpackDouble2x32_y(foo))
* packInt2x32(foo) -> packInt2x32Split(foo.x, foo.y)
* unpackInt2x32(foo) -> vec2(unpackInt2x32_x(foo), unpackInt2x32_y(foo))
*/
static nir_ssa_def *
@@ -46,6 +48,20 @@ lower_unpack_double(nir_builder *b, nir_ssa_def *src)
nir_unpack_double_2x32_split_y(b, src));
}
static nir_ssa_def *
lower_pack_int(nir_builder *b, nir_ssa_def *src)
{
return nir_pack_int_2x32_split(b, nir_channel(b, src, 0),
nir_channel(b, src, 1));
}
static nir_ssa_def *
lower_unpack_int(nir_builder *b, nir_ssa_def *src)
{
return nir_vec2(b, nir_unpack_int_2x32_split_x(b, src),
nir_unpack_int_2x32_split_y(b, src));
}
static void
lower_double_pack_impl(nir_function_impl *impl)
{
@@ -60,16 +76,32 @@ lower_double_pack_impl(nir_function_impl *impl)
nir_alu_instr *alu_instr = (nir_alu_instr *) instr;
if (alu_instr->op != nir_op_pack_double_2x32 &&
alu_instr->op != nir_op_unpack_double_2x32)
alu_instr->op != nir_op_unpack_double_2x32 &&
alu_instr->op != nir_op_pack_int_2x32 &&
alu_instr->op != nir_op_unpack_int_2x32)
continue;
b.cursor = nir_before_instr(&alu_instr->instr);
nir_ssa_def *src = nir_ssa_for_alu_src(&b, alu_instr, 0);
nir_ssa_def *dest =
alu_instr->op == nir_op_pack_double_2x32 ?
lower_pack_double(&b, src) :
lower_unpack_double(&b, src);
nir_ssa_def *dest;
switch (alu_instr->op) {
case nir_op_pack_double_2x32:
dest = lower_pack_double(&b, src);
break;
case nir_op_unpack_double_2x32:
dest = lower_unpack_double(&b, src);
break;
case nir_op_pack_int_2x32:
dest = lower_pack_int(&b, src);
break;
case nir_op_unpack_int_2x32:
dest = lower_unpack_int(&b, src);
break;
default:
unreachable("Impossible opcode");
}
nir_ssa_def_rewrite_uses(&alu_instr->dest.dest.ssa, nir_src_for_ssa(dest));
nir_instr_remove(&alu_instr->instr);