agx: Add nest field to IR

Needed to model control flow instructions.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11023>

src/asahi/compiler/agx_compiler.h

@@ -278,6 +278,9 @@ typedef struct {
     * scoreboarding (everything but memory load/store and texturing). */
    unsigned scoreboard : 1;
 
+   /* Number of nested control flow layers to jump by */
+   unsigned nest : 2;
+
    /* Output modifiers */
    bool saturate : 1;
    unsigned mask : 4;

src/asahi/compiler/agx_opcodes.py

@@ -86,6 +86,7 @@ DIM = immediate("dim", "enum agx_dim")
 SCOREBOARD = immediate("scoreboard")
 ICOND = immediate("icond")
 FCOND = immediate("fcond")
+NEST = immediate("nest")
 
 FUNOP = lambda x: (x << 28)
 FUNOP_MASK = FUNOP((1 << 14) - 1)

src/asahi/compiler/agx_print.c

@@ -167,6 +167,15 @@ agx_print_instr(agx_instr *I, FILE *fp)
       fprintf(fp, "slot %u", I->scoreboard);
    }
 
+   if (info.immediates & AGX_IMMEDIATE_NEST) {
+      if (print_comma)
+         fprintf(fp, ", ");
+      else
+         print_comma = true;
+
+      fprintf(fp, "n=%u", I->nest);
+   }
+
    fprintf(fp, "\n");
 }