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nir: Add an interface for the builder to insert instructions before.

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So far we'd only used nir_builder to build brand new programs.  But if
we're doing modifications to instructions (like in a lowering pass), then
we want to generate new stuff before the instruction we're modifying.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Eric Anholt 2015-03-27 14:18:54 -07:00
parent 328375d274
commit ec02970205
1 changed files with 23 additions and 4 deletions
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27
src/glsl/nir/nir_builder.h
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@ -28,6 +28,8 @@ struct exec_list;
typedef struct nir_builder {
struct exec_list *cf_node_list;
nir_instr *before_instr;
nir_shader *shader;
nir_function_impl *impl;
} nir_builder;
@ -47,6 +49,23 @@ nir_builder_insert_after_cf_list(nir_builder *build,
build->cf_node_list = cf_node_list;
}
static inline void
nir_builder_insert_before_instr(nir_builder *build, nir_instr *before_instr)
{
build->before_instr = before_instr;
}
static inline void
nir_builder_instr_insert(nir_builder *build, nir_instr *instr)
{
if (build->cf_node_list) {
nir_instr_insert_after_cf_list(build->cf_node_list, instr);
} else {
assert(build->before_instr);
nir_instr_insert_before(build->before_instr, instr);
}
}
static inline nir_ssa_def *
nir_build_imm(nir_builder *build, unsigned num_components, nir_const_value value)
{
@ -57,7 +76,7 @@ nir_build_imm(nir_builder *build, unsigned num_components, nir_const_value value
load_const->value = value;
nir_instr_insert_after_cf_list(build->cf_node_list, &load_const->instr);
nir_builder_instr_insert(build, &load_const->instr);
return &load_const->def;
}
@ -125,7 +144,7 @@ nir_build_alu(nir_builder *build, nir_op op, nir_ssa_def *src0,
nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, NULL);
instr->dest.write_mask = (1 << num_components) - 1;
nir_instr_insert_after_cf_list(build->cf_node_list, &instr->instr);
nir_builder_instr_insert(build, &instr->instr);
return &instr->dest.dest.ssa;
}
@ -172,7 +191,7 @@ nir_fmov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
mov->dest.write_mask = (1 << num_components) - 1;
mov->src[0] = src;
nir_instr_insert_after_cf_list(build->cf_node_list, &mov->instr);
nir_builder_instr_insert(build, &mov->instr);
return &mov->dest.dest.ssa;
}
@ -184,7 +203,7 @@ nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
mov->dest.write_mask = (1 << num_components) - 1;
mov->src[0] = src;
nir_instr_insert_after_cf_list(build->cf_node_list, &mov->instr);
nir_builder_instr_insert(build, &mov->instr);
return &mov->dest.dest.ssa;
}