tgsi: update fallthrough comments

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7747>

src/gallium/auxiliary/tgsi/tgsi_exec.c

@@ -58,6 +58,7 @@
 #include "tgsi/tgsi_parse.h"
 #include "tgsi/tgsi_util.h"
 #include "tgsi_exec.h"
+#include "util/compiler.h"
 #include "util/half_float.h"
 #include "util/u_memory.h"
 #include "util/u_math.h"
@@ -2565,7 +2566,7 @@ exec_txf(struct tgsi_exec_machine *mach,
    case TGSI_TEXTURE_SHADOW2D_ARRAY:
    case TGSI_TEXTURE_2D_ARRAY_MSAA:
       IFETCH(&r[2], 0, TGSI_CHAN_Z);
-      /* fallthrough */
+      FALLTHROUGH;
    case TGSI_TEXTURE_2D:
    case TGSI_TEXTURE_RECT:
    case TGSI_TEXTURE_SHADOW1D_ARRAY:
@@ -2574,7 +2575,7 @@ exec_txf(struct tgsi_exec_machine *mach,
    case TGSI_TEXTURE_1D_ARRAY:
    case TGSI_TEXTURE_2D_MSAA:
       IFETCH(&r[1], 0, TGSI_CHAN_Y);
-      /* fallthrough */
+      FALLTHROUGH;
    case TGSI_TEXTURE_BUFFER:
    case TGSI_TEXTURE_1D:
    case TGSI_TEXTURE_SHADOW1D:

src/gallium/auxiliary/tgsi/tgsi_from_mesa.c

@@ -25,6 +25,8 @@
 
 #include "pipe/p_compiler.h"
 
+#include "util/compiler.h"
+
 /**
  * Determine the semantic index that is used when the given varying is mapped
  * to TGSI_SEMANTIC_GENERIC.
@@ -157,7 +159,7 @@ tgsi_get_gl_varying_semantic(gl_varying_slot attr,
          *semantic_index = attr - VARYING_SLOT_TEX0;
          break;
       }
-      /* fall through */
+      FALLTHROUGH;
    case VARYING_SLOT_VAR0:
    default:
       assert(attr >= VARYING_SLOT_VAR0 ||

src/gallium/auxiliary/tgsi/tgsi_lowering.c

@@ -28,6 +28,7 @@
 #include "tgsi/tgsi_scan.h"
 #include "tgsi/tgsi_dump.h"
 
+#include "util/compiler.h"
 #include "util/u_debug.h"
 #include "util/u_math.h"
 
@@ -1068,7 +1069,7 @@ transform_samp(struct tgsi_transform_context *tctx,
       if (ctx->config->saturate_r & smask)
          mask |= TGSI_WRITEMASK_Z;
       pmask |= TGSI_WRITEMASK_Z;
-      /* fallthrough */
+      FALLTHROUGH;
 
    case TGSI_TEXTURE_2D:
    case TGSI_TEXTURE_2D_ARRAY:
@@ -1079,7 +1080,7 @@ transform_samp(struct tgsi_transform_context *tctx,
       if (ctx->config->saturate_t & smask)
          mask |= TGSI_WRITEMASK_Y;
       pmask |= TGSI_WRITEMASK_Y;
-      /* fallthrough */
+      FALLTHROUGH;
 
    case TGSI_TEXTURE_1D:
    case TGSI_TEXTURE_1D_ARRAY: