[Bf-blender-cvs] [7df651367fb] master: Cleanup: use an intermediate value for cast_primitive_type

[Campbell Barton]

Commit: 7df651367fbd8c9510c7e02b18301bd2f28c3574
Author: Campbell Barton
Date:   Tue Feb 8 11:50:14 2022 +1100
Branches: master
https://developer.blender.org/rB7df651367fbd8c9510c7e02b18301bd2f28c3574

Cleanup: use an intermediate value for cast_primitive_type

Assign the actual value before casting to large uint64_t/double types.

This improves readability, especially in cases where both pointer
and integer casts were used in one expression, to make matters worse
clang-format treated these casts as a multiplication.

This also made debugging/printing the values more of a hassle.

No functional changes (GCC produced identical output).

===================================================================

M	source/blender/makesdna/intern/dna_genfile.c

===================================================================

diff --git a/source/blender/makesdna/intern/dna_genfile.c b/source/blender/makesdna/intern/dna_genfile.c
index 6322cb459dd..7e9fabcc998 100644
--- a/source/blender/makesdna/intern/dna_genfile.c
+++ b/source/blender/makesdna/intern/dna_genfile.c
@@ -737,45 +737,65 @@ static void cast_primitive_type(const eSDNA_Type old_type,
 
   for (int a = 0; a < array_len; a++) {
     switch (old_type) {
-      case SDNA_TYPE_CHAR:
-        old_value_i = *old_data;
+      case SDNA_TYPE_CHAR: {
+        const char value = *old_data;
+        old_value_i = value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_UCHAR:
-        old_value_i = *((unsigned char *)old_data);
+      }
+      case SDNA_TYPE_UCHAR: {
+        const uchar value = *((uchar *)old_data);
+        old_value_i = value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_SHORT:
-        old_value_i = *((short *)old_data);
+      }
+      case SDNA_TYPE_SHORT: {
+        const short value = *((short *)old_data);
+        old_value_i = value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_USHORT:
-        old_value_i = *((unsigned short *)old_data);
+      }
+      case SDNA_TYPE_USHORT: {
+        const ushort value = *((unsigned short *)old_data);
+        old_value_i = value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_INT:
-        old_value_i = *((int *)old_data);
+      }
+      case SDNA_TYPE_INT: {
+        const int value = *((int *)old_data);
+        old_value_i = value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_FLOAT:
-        old_value_f = *((float *)old_data);
+      }
+      case SDNA_TYPE_FLOAT: {
+        const float value = *((float *)old_data);
+        old_value_f = value;
         old_value_i = (uint64_t)(int64_t)old_value_f;
         break;
-      case SDNA_TYPE_DOUBLE:
-        old_value_f = *((double *)old_data);
+      }
+      case SDNA_TYPE_DOUBLE: {
+        const double value = *((double *)old_data);
+        old_value_f = value;
         old_value_i = (uint64_t)(int64_t)old_value_f;
         break;
-      case SDNA_TYPE_INT64:
-        old_value_i = (uint64_t) * ((int64_t *)old_data);
+      }
+      case SDNA_TYPE_INT64: {
+        const int64_t value = *((int64_t *)old_data);
+        old_value_i = (uint64_t)value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_UINT64:
-        old_value_i = *((uint64_t *)old_data);
+      }
+      case SDNA_TYPE_UINT64: {
+        const uint64_t value = *((uint64_t *)old_data);
+        old_value_i = value;
         old_value_f = (double)old_value_i;
         break;
-      case SDNA_TYPE_INT8:
-        old_value_i = (uint64_t) * ((int8_t *)old_data);
+      }
+      case SDNA_TYPE_INT8: {
+        const int8_t value = *((int8_t *)old_data);
+        old_value_i = (uint64_t)value;
         old_value_f = (double)old_value_i;
+      }
     }
 
     switch (new_type) {