nir: Only float and double types can be matrices

In 19a541f (nir: Get rid of nir_constant_data) a number of places that
operated on nir_constant::values were mechanically converted to operate
on the whole array without regard for the base type.  Only
GLSL_TYPE_FLOAT and GLSL_TYPE_DOUBLE can be matrices, so only those
types can have data in the non-0 array element.

See also b870394.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Cc: Iago Toral Quiroga <itoral@igalia.com>
diff --git a/src/compiler/glsl/glsl_to_nir.cpp b/src/compiler/glsl/glsl_to_nir.cpp
index 4debc37..18a53b6 100644
--- a/src/compiler/glsl/glsl_to_nir.cpp
+++ b/src/compiler/glsl/glsl_to_nir.cpp
@@ -207,17 +207,21 @@
    ret->num_elements = 0;
    switch (ir->type->base_type) {
    case GLSL_TYPE_UINT:
-      for (unsigned c = 0; c < cols; c++) {
-         for (unsigned r = 0; r < rows; r++)
-            ret->values[c].u32[r] = ir->value.u[c * rows + r];
-      }
+      /* Only float base types can be matrices. */
+      assert(cols == 1);
+
+      for (unsigned r = 0; r < rows; r++)
+         ret->values[0].u32[r] = ir->value.u[r];
+
       break;
 
    case GLSL_TYPE_INT:
-      for (unsigned c = 0; c < cols; c++) {
-         for (unsigned r = 0; r < rows; r++)
-            ret->values[c].i32[r] = ir->value.i[c * rows + r];
-      }
+      /* Only float base types can be matrices. */
+      assert(cols == 1);
+
+      for (unsigned r = 0; r < rows; r++)
+         ret->values[0].i32[r] = ir->value.i[r];
+
       break;
 
    case GLSL_TYPE_FLOAT:
@@ -235,12 +239,12 @@
       break;
 
    case GLSL_TYPE_BOOL:
-      for (unsigned c = 0; c < cols; c++) {
-         for (unsigned r = 0; r < rows; r++) {
-            ret->values[c].u32[r] = ir->value.b[c * rows + r] ?
-                                    NIR_TRUE : NIR_FALSE;
-         }
-      }
+      /* Only float base types can be matrices. */
+      assert(cols == 1);
+
+      for (unsigned r = 0; r < rows; r++)
+         ret->values[0].u32[r] = ir->value.b[r] ? NIR_TRUE : NIR_FALSE;
+
       break;
 
    case GLSL_TYPE_STRUCT:
diff --git a/src/compiler/nir/nir_print.c b/src/compiler/nir/nir_print.c
index eb5f57f..e51b6f5 100644
--- a/src/compiler/nir/nir_print.c
+++ b/src/compiler/nir/nir_print.c
@@ -303,11 +303,12 @@
    case GLSL_TYPE_UINT:
    case GLSL_TYPE_INT:
    case GLSL_TYPE_BOOL:
-      for (i = 0; i < cols; i++) {
-         for (j = 0; j < rows; j++) {
-            if (i + j > 0) fprintf(fp, ", ");
-            fprintf(fp, "0x%08x", c->values[i].u32[j]);
-         }
+      /* Only float base types can be matrices. */
+      assert(cols == 1);
+
+      for (i = 0; i < rows; i++) {
+         if (i > 0) fprintf(fp, ", ");
+         fprintf(fp, "0x%08x", c->values[0].u32[i]);
       }
       break;