nir: Get rid of nir_register::is_packed

All we ever do is initialize it to zero, clone it, print it, and
validate it.  No one ever sets or uses it.

Acked-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/compiler/nir/nir.c

@@ -83,7 +83,6 @@ reg_create(void *mem_ctx, struct exec_list *list)
    reg->num_components = 0;
    reg->bit_size = 32;
    reg->num_array_elems = 0;
-   reg->is_packed = false;
    reg->name = NULL;
 
    exec_list_push_tail(list, &reg->node);

src/compiler/nir/nir.h

@@ -456,17 +456,6 @@ typedef struct nir_register {
    /** whether this register is local (per-function) or global (per-shader) */
    bool is_global;
 
-   /**
-    * If this flag is set to true, then accessing channels >= num_components
-    * is well-defined, and simply spills over to the next array element. This
-    * is useful for backends that can do per-component accessing, in
-    * particular scalar backends. By setting this flag and making
-    * num_components equal to 1, structures can be packed tightly into
-    * registers and then registers can be accessed per-component to get to
-    * each structure member, even if it crosses vec4 boundaries.
-    */
-   bool is_packed;
-
    /** set of nir_srcs where this register is used (read from) */
    struct list_head uses;
 

src/compiler/nir/nir_clone.c

@@ -207,7 +207,6 @@ clone_register(clone_state *state, const nir_register *reg)
    nreg->index = reg->index;
    nreg->name = ralloc_strdup(nreg, reg->name);
    nreg->is_global = reg->is_global;
-   nreg->is_packed = reg->is_packed;
 
    /* reconstructing uses/defs/if_uses handled by nir_instr_insert() */
    list_inithead(&nreg->uses);

src/compiler/nir/nir_lower_regs_to_ssa.c

@@ -230,7 +230,7 @@ nir_lower_regs_to_ssa_impl(nir_function_impl *impl)
    NIR_VLA(BITSET_WORD, defs, block_set_words);
 
    nir_foreach_register(reg, &impl->registers) {
-      if (reg->num_array_elems != 0 || reg->is_packed) {
+      if (reg->num_array_elems != 0) {
          /* This pass only really works on "plain" registers.  If it's a
           * packed or array register, just set the value to NULL so that the
           * rewrite portion of the pass will know to ignore it.

src/compiler/nir/nir_print.c

@@ -97,8 +97,6 @@ print_register_decl(nir_register *reg, print_state *state)
 {
    FILE *fp = state->fp;
    fprintf(fp, "decl_reg %s %u ", sizes[reg->num_components], reg->bit_size);
-   if (reg->is_packed)
-      fprintf(fp, "(packed) ");
    print_register(reg, state);
    if (reg->num_array_elems != 0)
       fprintf(fp, "[%u]", reg->num_array_elems);

src/compiler/nir/nir_serialize.c

@@ -236,7 +236,7 @@ write_register(write_ctx *ctx, const nir_register *reg)
    blob_write_uint32(ctx->blob, !!(reg->name));
    if (reg->name)
       blob_write_string(ctx->blob, reg->name);
-   blob_write_uint32(ctx->blob, reg->is_global << 1 | reg->is_packed);
+   blob_write_uint32(ctx->blob, reg->is_global << 1);
 }
 
 static nir_register *
@@ -257,7 +257,6 @@ read_register(read_ctx *ctx)
    }
    unsigned flags = blob_read_uint32(ctx->blob);
    reg->is_global = flags & 0x2;
-   reg->is_packed = flags & 0x1;
 
    list_inithead(&reg->uses);
    list_inithead(&reg->defs);

src/compiler/nir/nir_validate.c

@@ -156,12 +156,10 @@ validate_reg_src(nir_src *src, validate_state *state,
              "using a register declared in a different function");
    }
 
-   if (!src->reg.reg->is_packed) {
-      if (bit_sizes)
-         validate_assert(state, src->reg.reg->bit_size & bit_sizes);
-      if (num_components)
-         validate_assert(state, src->reg.reg->num_components == num_components);
-   }
+   if (bit_sizes)
+      validate_assert(state, src->reg.reg->bit_size & bit_sizes);
+   if (num_components)
+      validate_assert(state, src->reg.reg->num_components == num_components);
 
    validate_assert(state, (src->reg.reg->num_array_elems == 0 ||
           src->reg.base_offset < src->reg.reg->num_array_elems) &&
@@ -230,8 +228,6 @@ validate_alu_src(nir_alu_instr *instr, unsigned index, validate_state *state)
    nir_alu_src *src = &instr->src[index];
 
    unsigned num_components = nir_src_num_components(src->src);
-   if (!src->src.is_ssa && src->src.reg.reg->is_packed)
-      num_components = NIR_MAX_VEC_COMPONENTS; /* can't check anything */
    for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
       validate_assert(state, src->swizzle[i] < NIR_MAX_VEC_COMPONENTS);
 
@@ -263,12 +259,10 @@ validate_reg_dest(nir_reg_dest *dest, validate_state *state,
              "writing to a register declared in a different function");
    }
 
-   if (!dest->reg->is_packed) {
-      if (bit_sizes)
-         validate_assert(state, dest->reg->bit_size & bit_sizes);
-      if (num_components)
-         validate_assert(state, dest->reg->num_components == num_components);
-   }
+   if (bit_sizes)
+      validate_assert(state, dest->reg->bit_size & bit_sizes);
+   if (num_components)
+      validate_assert(state, dest->reg->num_components == num_components);
 
    validate_assert(state, (dest->reg->num_array_elems == 0 ||
           dest->base_offset < dest->reg->num_array_elems) &&
@@ -327,12 +321,11 @@ validate_alu_dest(nir_alu_instr *instr, validate_state *state)
    nir_alu_dest *dest = &instr->dest;
 
    unsigned dest_size = nir_dest_num_components(dest->dest);
-   bool is_packed = !dest->dest.is_ssa && dest->dest.reg.reg->is_packed;
    /*
     * validate that the instruction doesn't write to components not in the
     * register/SSA value
     */
-   validate_assert(state, is_packed || !(dest->write_mask & ~((1 << dest_size) - 1)));
+   validate_assert(state, !(dest->write_mask & ~((1 << dest_size) - 1)));
 
    /* validate that saturate is only ever used on instructions with
     * destinations of type float