pan/va: Add whitespace after disassembled branches

To make the disassembly easier to read, add whitespace after disassembled
branches. This makes the basic blocks of the original control flow graph more
obvious, to aid comparison with the IR.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16409>

src/panfrost/bifrost/valhall/disassemble.h

@@ -61,6 +61,15 @@ disassemble_valhall(FILE *fp, const uint64_t *code, unsigned size, bool verbose)
 
       va_disasm_instr(fp, instr);
       fprintf(fp, "\n");
+
+      /* Detect branches */
+      uint64_t opcode = (instr >> 48) & MASK(9);
+      bool branchz = (opcode == 0x1F);
+      bool branchzi = (opcode == 0x2F);
+
+      /* Separate blocks visually by inserting whitespace after branches */
+      if (branchz || branchzi)
+         fprintf(fp, "\n");
    }
 
    fprintf(fp, "\n");