pan/bi: Add no_spill flag to IR

Will be used to prevent double spills.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7206>

src/panfrost/bifrost/bi_print.c

@@ -285,6 +285,9 @@ bi_print_instruction(bi_instruction *ins, FILE *fp)
         if (ins->skip)
                 fprintf(fp, ".skip");
 
+        if (ins->no_spill)
+                fprintf(fp, ".no_spill");
+
         if (ins->vector_channels)
                 fprintf(fp, ".v%u", ins->vector_channels);
 

src/panfrost/bifrost/compiler.h

@@ -314,6 +314,10 @@ typedef struct {
         /* For memory ops, base address */
         enum bi_segment segment;
 
+        /* Can we spill the value written here? Used to prevent
+         * useless double fills */
+        bool no_spill;
+
         /* A class-specific op from which the actual opcode can be derived
          * (along with the above information) */