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nir: Add a helper for getting a constant value from an SSA source

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Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Jason Ekstrand 2014-12-08 17:34:23 -08:00
parent 940ccc45ad
commit a3ad7fdf33
2 changed files with 20 additions and 0 deletions
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19
src/glsl/nir/nir.c
View file

@ -1672,6 +1672,25 @@ nir_foreach_src(nir_instr *instr, nir_foreach_src_cb cb, void *state)
return nir_foreach_dest(instr, visit_dest_indirect, &dest_state);
}
nir_const_value *
nir_src_as_const_value(nir_src src)
{
if (!src.is_ssa)
return NULL;
if (src.ssa->parent_instr->type != nir_instr_type_load_const)
return NULL;
nir_load_const_instr *load = nir_instr_as_load_const(src.ssa->parent_instr);
if (load->array_elems == 0)
return &load->value;
if (load->array_elems == 1)
return load->array;
else
return NULL;
}
bool
nir_srcs_equal(nir_src src1, nir_src src2)
{

1
src/glsl/nir/nir.h
View file

@ -1326,6 +1326,7 @@ typedef bool (*nir_foreach_src_cb)(nir_src *src, void *state);
bool nir_foreach_dest(nir_instr *instr, nir_foreach_dest_cb cb, void *state);
bool nir_foreach_src(nir_instr *instr, nir_foreach_src_cb cb, void *state);
nir_const_value *nir_src_as_const_value(nir_src src);
bool nir_srcs_equal(nir_src src1, nir_src src2);
void nir_instr_rewrite_src(nir_instr *instr, nir_src *src, nir_src new_src);