nir: Make nir_constant a vector rather than a matrix

Most places in NIR, we treat matrices like arrays.  The one annoying
exception to this has been nir_constant where a matrix is a first-class
thing.  This commit changes that so a matrix nir_constant is the same as
an array nir_constant.  This makes matrix nir_constants a tiny bit more
expensive but shrinks all others by 96B.
Reviewed-by: Karol Herbst <kherbst@redhat.com>

src/compiler/glsl/gl_nir_link_uniform_initializers.c

@@ -121,29 +121,34 @@ copy_constant_to_storage(union gl_constant_value *storage,
    unsigned dmul = glsl_base_type_is_64bit(base_type) ? 2 : 1;
    int i = 0;
 
-   for (unsigned int column = 0; column < n_columns; column++) {
+   if (n_columns > 0) {
+      const struct glsl_type *column_type = glsl_get_column_type(type);
+      for (unsigned int column = 0; column < n_columns; column++) {
+         copy_constant_to_storage(&storage[i], val->elements[column],
+                                  column_type, boolean_true);
+         i += n_rows * dmul;
+      }
+   } else {
       for (unsigned int row = 0; row < n_rows; row++) {
          switch (base_type) {
          case GLSL_TYPE_UINT:
-            storage[i].u = val->values[column][row].u32;
+            storage[i].u = val->values[row].u32;
             break;
          case GLSL_TYPE_INT:
          case GLSL_TYPE_SAMPLER:
-            storage[i].i = val->values[column][row].i32;
+            storage[i].i = val->values[row].i32;
             break;
          case GLSL_TYPE_FLOAT:
-            storage[i].f = val->values[column][row].f32;
+            storage[i].f = val->values[row].f32;
             break;
          case GLSL_TYPE_DOUBLE:
          case GLSL_TYPE_UINT64:
          case GLSL_TYPE_INT64:
             /* XXX need to check on big-endian */
-            memcpy(&storage[i * 2].u,
-                   &val->values[column][row].f64,
-                   sizeof(double));
+            memcpy(&storage[i * 2].u, &val->values[row].f64, sizeof(double));
             break;
          case GLSL_TYPE_BOOL:
-            storage[i].b = val->values[column][row].u32 ? boolean_true : 0;
+            storage[i].b = val->values[row].u32 ? boolean_true : 0;
             break;
          case GLSL_TYPE_ARRAY:
          case GLSL_TYPE_STRUCT:

src/compiler/glsl/glsl_to_nir.cpp

@@ -307,7 +307,7 @@ nir_visitor::constant_copy(ir_constant *ir, void *mem_ctx)
       assert(cols == 1);
 
       for (unsigned r = 0; r < rows; r++)
-         ret->values[0][r].u32 = ir->value.u[r];
+         ret->values[r].u32 = ir->value.u[r];
 
       break;
 
@@ -316,21 +316,49 @@ nir_visitor::constant_copy(ir_constant *ir, void *mem_ctx)
       assert(cols == 1);
 
       for (unsigned r = 0; r < rows; r++)
-         ret->values[0][r].i32 = ir->value.i[r];
+         ret->values[r].i32 = ir->value.i[r];
 
       break;
 
    case GLSL_TYPE_FLOAT:
-      for (unsigned c = 0; c < cols; c++) {
-         for (unsigned r = 0; r < rows; r++)
-            ret->values[c][r].f32 = ir->value.f[c * rows + r];
-      }
-      break;
-
    case GLSL_TYPE_DOUBLE:
-      for (unsigned c = 0; c < cols; c++) {
-         for (unsigned r = 0; r < rows; r++)
-            ret->values[c][r].f64 = ir->value.d[c * rows + r];
+      if (cols > 1) {
+         ret->elements = ralloc_array(mem_ctx, nir_constant *, cols);
+         ret->num_elements = cols;
+         for (unsigned c = 0; c < cols; c++) {
+            nir_constant *col_const = rzalloc(mem_ctx, nir_constant);
+            col_const->num_elements = 0;
+            switch (ir->type->base_type) {
+            case GLSL_TYPE_FLOAT:
+               for (unsigned r = 0; r < rows; r++)
+                  col_const->values[r].f32 = ir->value.f[c * rows + r];
+               break;
+
+            case GLSL_TYPE_DOUBLE:
+               for (unsigned r = 0; r < rows; r++)
+                  col_const->values[r].f64 = ir->value.d[c * rows + r];
+               break;
+
+            default:
+               unreachable("Cannot get here from the first level switch");
+            }
+            ret->elements[c] = col_const;
+         }
+      } else {
+         switch (ir->type->base_type) {
+         case GLSL_TYPE_FLOAT:
+            for (unsigned r = 0; r < rows; r++)
+               ret->values[r].f32 = ir->value.f[r];
+            break;
+
+         case GLSL_TYPE_DOUBLE:
+            for (unsigned r = 0; r < rows; r++)
+               ret->values[r].f64 = ir->value.d[r];
+            break;
+
+         default:
+            unreachable("Cannot get here from the first level switch");
+         }
       }
       break;
 
@@ -339,7 +367,7 @@ nir_visitor::constant_copy(ir_constant *ir, void *mem_ctx)
       assert(cols == 1);
 
       for (unsigned r = 0; r < rows; r++)
-         ret->values[0][r].u64 = ir->value.u64[r];
+         ret->values[r].u64 = ir->value.u64[r];
       break;
 
    case GLSL_TYPE_INT64:
@@ -347,7 +375,7 @@ nir_visitor::constant_copy(ir_constant *ir, void *mem_ctx)
       assert(cols == 1);
 
       for (unsigned r = 0; r < rows; r++)
-         ret->values[0][r].i64 = ir->value.i64[r];
+         ret->values[r].i64 = ir->value.i64[r];
       break;
 
    case GLSL_TYPE_BOOL:
@@ -355,7 +383,7 @@ nir_visitor::constant_copy(ir_constant *ir, void *mem_ctx)
       assert(cols == 1);
 
       for (unsigned r = 0; r < rows; r++)
-         ret->values[0][r].b = ir->value.b[r];
+         ret->values[r].b = ir->value.b[r];
 
       break;
 

src/compiler/nir/nir.h

@@ -148,7 +148,7 @@ typedef struct nir_constant {
     * by the type associated with the \c nir_variable.  Constants may be
     * scalars, vectors, or matrices.
     */
-   nir_const_value values[NIR_MAX_MATRIX_COLUMNS][NIR_MAX_VEC_COMPONENTS];
+   nir_const_value values[NIR_MAX_VEC_COMPONENTS];
 
    /* we could get this from the var->type but makes clone *much* easier to
     * not have to care about the type.

src/compiler/nir/nir_lower_constant_initializers.c

@@ -32,21 +32,9 @@ build_constant_load(nir_builder *b, nir_deref_instr *deref, nir_constant *c)
          nir_load_const_instr_create(b->shader,
                                      glsl_get_vector_elements(deref->type),
                                      glsl_get_bit_size(deref->type));
-      memcpy(load->value, c->values[0], sizeof(*load->value) * load->def.num_components);
+      memcpy(load->value, c->values, sizeof(*load->value) * load->def.num_components);
       nir_builder_instr_insert(b, &load->instr);
       nir_store_deref(b, deref, &load->def, ~0);
-   } else if (glsl_type_is_matrix(deref->type)) {
-      unsigned cols = glsl_get_matrix_columns(deref->type);
-      unsigned rows = glsl_get_vector_elements(deref->type);
-      unsigned bit_size = glsl_get_bit_size(deref->type);
-      for (unsigned i = 0; i < cols; i++) {
-         nir_load_const_instr *load =
-            nir_load_const_instr_create(b->shader, rows, bit_size);
-         memcpy(load->value, c->values[i], sizeof(*load->value) * load->def.num_components);
-         nir_builder_instr_insert(b, &load->instr);
-         nir_store_deref(b, nir_build_deref_array_imm(b, deref, i),
-                         &load->def, ~0);
-      }
    } else if (glsl_type_is_struct_or_ifc(deref->type)) {
       unsigned len = glsl_get_length(deref->type);
       for (unsigned i = 0; i < len; i++) {
@@ -54,7 +42,8 @@ build_constant_load(nir_builder *b, nir_deref_instr *deref, nir_constant *c)
                              c->elements[i]);
       }
    } else {
-      assert(glsl_type_is_array(deref->type));
+      assert(glsl_type_is_array(deref->type) ||
+             glsl_type_is_matrix(deref->type));
       unsigned len = glsl_get_length(deref->type);
       for (unsigned i = 0; i < len; i++) {
          build_constant_load(b,

src/compiler/nir/nir_print.c

@@ -291,7 +291,7 @@ print_constant(nir_constant *c, const struct glsl_type *type, print_state *state
    FILE *fp = state->fp;
    const unsigned rows = glsl_get_vector_elements(type);
    const unsigned cols = glsl_get_matrix_columns(type);
-   unsigned i, j;
+   unsigned i;
 
    switch (glsl_get_base_type(type)) {
    case GLSL_TYPE_BOOL:
@@ -300,7 +300,7 @@ print_constant(nir_constant *c, const struct glsl_type *type, print_state *state
 
       for (i = 0; i < rows; i++) {
          if (i > 0) fprintf(fp, ", ");
-         fprintf(fp, "%s", c->values[0][i].b ? "true" : "false");
+         fprintf(fp, "%s", c->values[i].b ? "true" : "false");
       }
       break;
 
@@ -311,7 +311,7 @@ print_constant(nir_constant *c, const struct glsl_type *type, print_state *state
 
       for (i = 0; i < rows; i++) {
          if (i > 0) fprintf(fp, ", ");
-         fprintf(fp, "0x%02x", c->values[0][i].u8);
+         fprintf(fp, "0x%02x", c->values[i].u8);
       }
       break;
 
@@ -322,7 +322,7 @@ print_constant(nir_constant *c, const struct glsl_type *type, print_state *state
 
       for (i = 0; i < rows; i++) {
          if (i > 0) fprintf(fp, ", ");
-         fprintf(fp, "0x%04x", c->values[0][i].u16);
+         fprintf(fp, "0x%04x", c->values[i].u16);
       }
       break;
 
@@ -333,33 +333,43 @@ print_constant(nir_constant *c, const struct glsl_type *type, print_state *state
 
       for (i = 0; i < rows; i++) {
          if (i > 0) fprintf(fp, ", ");
-         fprintf(fp, "0x%08x", c->values[0][i].u32);
+         fprintf(fp, "0x%08x", c->values[i].u32);
       }
       break;
 
    case GLSL_TYPE_FLOAT16:
-      for (i = 0; i < cols; i++) {
-         for (j = 0; j < rows; j++) {
-            if (i + j > 0) fprintf(fp, ", ");
-            fprintf(fp, "%f", _mesa_half_to_float(c->values[i][j].u16));
-         }
-      }
-      break;
-
    case GLSL_TYPE_FLOAT:
-      for (i = 0; i < cols; i++) {
-         for (j = 0; j < rows; j++) {
-            if (i + j > 0) fprintf(fp, ", ");
-            fprintf(fp, "%f", c->values[i][j].f32);
-         }
-      }
-      break;
-
    case GLSL_TYPE_DOUBLE:
-      for (i = 0; i < cols; i++) {
-         for (j = 0; j < rows; j++) {
-            if (i + j > 0) fprintf(fp, ", ");
-            fprintf(fp, "%f", c->values[i][j].f64);
+      if (cols > 1) {
+         for (i = 0; i < cols; i++) {
+            if (i > 0) fprintf(fp, ", ");
+            print_constant(c->elements[i], glsl_get_column_type(type), state);
+         }
+      } else {
+         switch (glsl_get_base_type(type)) {
+         case GLSL_TYPE_FLOAT16:
+            for (i = 0; i < rows; i++) {
+               if (i > 0) fprintf(fp, ", ");
+               fprintf(fp, "%f", _mesa_half_to_float(c->values[i].u16));
+            }
+            break;
+
+         case GLSL_TYPE_FLOAT:
+            for (i = 0; i < rows; i++) {
+               if (i > 0) fprintf(fp, ", ");
+               fprintf(fp, "%f", c->values[i].f32);
+            }
+            break;
+
+         case GLSL_TYPE_DOUBLE:
+            for (i = 0; i < rows; i++) {
+               if (i > 0) fprintf(fp, ", ");
+               fprintf(fp, "%f", c->values[i].f64);
+            }
+            break;
+
+         default:
+            unreachable("Cannot get here from the first level switch");
          }
       }
       break;
@@ -371,7 +381,7 @@ print_constant(nir_constant *c, const struct glsl_type *type, print_state *state
 
       for (i = 0; i < cols; i++) {
          if (i > 0) fprintf(fp, ", ");
-         fprintf(fp, "0x%08" PRIx64, c->values[0][i].u64);
+         fprintf(fp, "0x%08" PRIx64, c->values[i].u64);
       }
       break;
 

src/compiler/spirv/spirv_to_nir.c

@@ -236,31 +236,19 @@ vtn_const_ssa_value(struct vtn_builder *b, nir_constant *constant,
          nir_load_const_instr *load =
             nir_load_const_instr_create(b->shader, num_components, bit_size);
 
-         memcpy(load->value, constant->values[0],
+         memcpy(load->value, constant->values,
                 sizeof(nir_const_value) * load->def.num_components);
 
          nir_instr_insert_before_cf_list(&b->nb.impl->body, &load->instr);
          val->def = &load->def;
       } else {
          assert(glsl_type_is_matrix(type));
-         unsigned rows = glsl_get_vector_elements(val->type);
          unsigned columns = glsl_get_matrix_columns(val->type);
          val->elems = ralloc_array(b, struct vtn_ssa_value *, columns);
-
-         for (unsigned i = 0; i < columns; i++) {
-            struct vtn_ssa_value *col_val = rzalloc(b, struct vtn_ssa_value);
-            col_val->type = glsl_get_column_type(val->type);
-            nir_load_const_instr *load =
-               nir_load_const_instr_create(b->shader, rows, bit_size);
-
-            memcpy(load->value, constant->values[i],
-                   sizeof(nir_const_value) * load->def.num_components);
-
-            nir_instr_insert_before_cf_list(&b->nb.impl->body, &load->instr);
-            col_val->def = &load->def;
-
-            val->elems[i] = col_val;
-         }
+         const struct glsl_type *column_type = glsl_get_column_type(val->type);
+         for (unsigned i = 0; i < columns; i++)
+            val->elems[i] = vtn_const_ssa_value(b, constant->elements[i],
+                                                column_type);
       }
       break;
    }
@@ -1542,7 +1530,7 @@ vtn_null_constant(struct vtn_builder *b, struct vtn_type *type)
       nir_address_format addr_format = vtn_mode_to_address_format(b, mode);
 
       const nir_const_value *null_value = nir_address_format_null_value(addr_format);
-      memcpy(c->values[0], null_value,
+      memcpy(c->values, null_value,
              sizeof(nir_const_value) * nir_address_format_num_components(addr_format));
       break;
    }
@@ -1662,7 +1650,7 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
           opcode == SpvOpSpecConstantFalse)
          int_val = get_specialization(b, val, int_val);
 
-      val->constant->values[0][0].b = int_val != 0;
+      val->constant->values[0].b = int_val != 0;
       break;
    }
 
@@ -1673,16 +1661,16 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
       int bit_size = glsl_get_bit_size(val->type->type);
       switch (bit_size) {
       case 64:
-         val->constant->values[0][0].u64 = vtn_u64_literal(&w[3]);
+         val->constant->values[0].u64 = vtn_u64_literal(&w[3]);
          break;
       case 32:
-         val->constant->values[0][0].u32 = w[3];
+         val->constant->values[0].u32 = w[3];
          break;
       case 16:
-         val->constant->values[0][0].u16 = w[3];
+         val->constant->values[0].u16 = w[3];
          break;
       case 8:
-         val->constant->values[0][0].u8 = w[3];
+         val->constant->values[0].u8 = w[3];
          break;
       default:
          vtn_fail("Unsupported SpvOpConstant bit size: %u", bit_size);
@@ -1697,17 +1685,17 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
       int bit_size = glsl_get_bit_size(val->type->type);
       switch (bit_size) {
       case 64:
-         val->constant->values[0][0].u64 =
+         val->constant->values[0].u64 =
             get_specialization64(b, val, vtn_u64_literal(&w[3]));
          break;
       case 32:
-         val->constant->values[0][0].u32 = get_specialization(b, val, w[3]);
+         val->constant->values[0].u32 = get_specialization(b, val, w[3]);
          break;
       case 16:
-         val->constant->values[0][0].u16 = get_specialization(b, val, w[3]);
+         val->constant->values[0].u16 = get_specialization(b, val, w[3]);
          break;
       case 8:
-         val->constant->values[0][0].u8 = get_specialization(b, val, w[3]);
+         val->constant->values[0].u8 = get_specialization(b, val, w[3]);
          break;
       default:
          vtn_fail("Unsupported SpvOpSpecConstant bit size");
@@ -1741,20 +1729,11 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
       case vtn_base_type_vector: {
          assert(glsl_type_is_vector(val->type->type));
          for (unsigned i = 0; i < elem_count; i++)
-            val->constant->values[0][i] = elems[i]->values[0][0];
+            val->constant->values[i] = elems[i]->values[0];
          break;
       }
 
       case vtn_base_type_matrix:
-         assert(glsl_type_is_matrix(val->type->type));
-         for (unsigned i = 0; i < elem_count; i++) {
-            unsigned components =
-               glsl_get_components(glsl_get_column_type(val->type->type));
-            memcpy(val->constant->values[i], elems[i]->values,
-                   sizeof(nir_const_value) * components);
-         }
-         break;
-
       case vtn_base_type_struct:
       case vtn_base_type_array:
          ralloc_steal(val->constant, elems);
@@ -1798,11 +1777,11 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
 
          if (v0->value_type == vtn_value_type_constant) {
             for (unsigned i = 0; i < len0; i++)
-               combined[i] = v0->constant->values[0][i];
+               combined[i] = v0->constant->values[i];
          }
          if (v1->value_type == vtn_value_type_constant) {
             for (unsigned i = 0; i < len1; i++)
-               combined[len0 + i] = v1->constant->values[0][i];
+               combined[len0 + i] = v1->constant->values[i];
          }
 
          for (unsigned i = 0, j = 0; i < count - 6; i++, j++) {
@@ -1811,12 +1790,12 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
                /* If component is not used, set the value to a known constant
                 * to detect if it is wrongly used.
                 */
-               val->constant->values[0][j] = undef;
+               val->constant->values[j] = undef;
             } else {
                vtn_fail_if(comp >= len0 + len1,
                            "All Component literals must either be FFFFFFFF "
                            "or in [0, N - 1] (inclusive).");
-               val->constant->values[0][j] = combined[comp];
+               val->constant->values[j] = combined[comp];
             }
          }
          break;
@@ -1840,7 +1819,6 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
          }
 
          int elem = -1;
-         int col = 0;
          const struct vtn_type *type = comp->type;
          for (unsigned i = deref_start; i < count; i++) {
             vtn_fail_if(w[i] > type->length,
@@ -1855,12 +1833,6 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
                break;
 
             case vtn_base_type_matrix:
-               assert(col == 0 && elem == -1);
-               col = w[i];
-               elem = 0;
-               type = type->array_element;
-               break;
-
             case vtn_base_type_array:
                c = &(*c)->elements[w[i]];
                type = type->array_element;
@@ -1883,7 +1855,7 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
             } else {
                unsigned num_components = type->length;
                for (unsigned i = 0; i < num_components; i++)
-                  val->constant->values[0][i] = (*c)->values[col][elem + i];
+                  val->constant->values[i] = (*c)->values[elem + i];
             }
          } else {
             struct vtn_value *insert =
@@ -1894,7 +1866,7 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
             } else {
                unsigned num_components = type->length;
                for (unsigned i = 0; i < num_components; i++)
-                  (*c)->values[col][elem + i] = insert->constant->values[0][i];
+                  (*c)->values[elem + i] = insert->constant->values[i];
             }
          }
          break;
@@ -1946,7 +1918,7 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
 
             unsigned j = swap ? 1 - i : i;
             for (unsigned c = 0; c < src_comps; c++)
-               src[j][c] = src_val->constant->values[0][c];
+               src[j][c] = src_val->constant->values[c];
          }
 
          /* fix up fixed size sources */
@@ -1972,7 +1944,7 @@ vtn_handle_constant(struct vtn_builder *b, SpvOp opcode,
          nir_const_value *srcs[3] = {
             src[0], src[1], src[2],
          };
-         nir_eval_const_opcode(op, val->constant->values[0], num_components, bit_size, srcs);
+         nir_eval_const_opcode(op, val->constant->values, num_components, bit_size, srcs);
          break;
       } /* default */
       }
@@ -2376,7 +2348,7 @@ vtn_handle_texture(struct vtn_builder *b, SpvOp opcode,
       unsigned bit_size = glsl_get_bit_size(vec_type->type);
       for (uint32_t i = 0; i < 4; i++) {
          const nir_const_value *cvec =
-            gather_offsets->constant->elements[i]->values[0];
+            gather_offsets->constant->elements[i]->values;
          for (uint32_t j = 0; j < 2; j++) {
             switch (bit_size) {
             case 8:  instr->tg4_offsets[i][j] = cvec[j].i8;    break;
@@ -4746,7 +4718,7 @@ spirv_to_nir(const uint32_t *words, size_t word_count,
                  glsl_vector_type(GLSL_TYPE_UINT, 3));
 
       nir_const_value *const_size =
-         b->workgroup_size_builtin->constant->values[0];
+         b->workgroup_size_builtin->constant->values;
 
       b->shader->info.cs.local_size[0] = const_size[0].u32;
       b->shader->info.cs.local_size[1] = const_size[1].u32;

src/compiler/spirv/vtn_amd.c

@@ -97,17 +97,17 @@ vtn_handle_amd_shader_ballot_instruction(struct vtn_builder *b, SpvOp ext_opcode
 
    if (intrin->intrinsic == nir_intrinsic_quad_swizzle_amd) {
       struct vtn_value *val = vtn_value(b, w[6], vtn_value_type_constant);
-      unsigned mask = val->constant->values[0][0].u32 |
-                      val->constant->values[0][1].u32 << 2 |
-                      val->constant->values[0][2].u32 << 4 |
-                      val->constant->values[0][3].u32 << 6;
+      unsigned mask = val->constant->values[0].u32 |
+                      val->constant->values[1].u32 << 2 |
+                      val->constant->values[2].u32 << 4 |
+                      val->constant->values[3].u32 << 6;
       nir_intrinsic_set_swizzle_mask(intrin, mask);
 
    } else if (intrin->intrinsic == nir_intrinsic_masked_swizzle_amd) {
       struct vtn_value *val = vtn_value(b, w[6], vtn_value_type_constant);
-      unsigned mask = val->constant->values[0][0].u32 |
-                      val->constant->values[0][1].u32 << 5 |
-                      val->constant->values[0][2].u32 << 10;
+      unsigned mask = val->constant->values[0].u32 |
+                      val->constant->values[1].u32 << 5 |
+                      val->constant->values[2].u32 << 10;
       nir_intrinsic_set_swizzle_mask(intrin, mask);
    }
 

src/compiler/spirv/vtn_private.h

@@ -708,10 +708,10 @@ vtn_constant_uint(struct vtn_builder *b, uint32_t value_id)
                "Expected id %u to be an integer constant", value_id);
 
    switch (glsl_get_bit_size(val->type->type)) {
-   case 8:  return val->constant->values[0][0].u8;
-   case 16: return val->constant->values[0][0].u16;
-   case 32: return val->constant->values[0][0].u32;
-   case 64: return val->constant->values[0][0].u64;
+   case 8:  return val->constant->values[0].u8;
+   case 16: return val->constant->values[0].u16;
+   case 32: return val->constant->values[0].u32;
+   case 64: return val->constant->values[0].u64;
    default: unreachable("Invalid bit size");
    }
 }
@@ -726,10 +726,10 @@ vtn_constant_int(struct vtn_builder *b, uint32_t value_id)
                "Expected id %u to be an integer constant", value_id);
 
    switch (glsl_get_bit_size(val->type->type)) {
-   case 8:  return val->constant->values[0][0].i8;
-   case 16: return val->constant->values[0][0].i16;
-   case 32: return val->constant->values[0][0].i32;
-   case 64: return val->constant->values[0][0].i64;
+   case 8:  return val->constant->values[0].i8;
+   case 16: return val->constant->values[0].i16;
+   case 32: return val->constant->values[0].i32;
+   case 64: return val->constant->values[0].i64;
    default: unreachable("Invalid bit size");
    }
 }