pan/midgard: Add mir_rewrite_index_src_single helper

Rather than rewriting an index away across the whole block, we expose
finer (per-instruction) granularity for rewrites.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

2 files changed, 13 insertions, 6 deletions

diff --git a/src/panfrost/midgard/compiler.h b/src/panfrost/midgard/compiler.h
index 2af902dbe71..294831c352e 100644
--- a/src/panfrost/midgard/compiler.h
+++ b/src/panfrost/midgard/compiler.h
@@ -365,6 +365,7 @@ mir_is_alu_bundle(midgard_bundle *bundle)
 void mir_rewrite_index(compiler_context *ctx, unsigned old, unsigned new);
 void mir_rewrite_index_src(compiler_context *ctx, unsigned old, unsigned new);
 void mir_rewrite_index_dst(compiler_context *ctx, unsigned old, unsigned new);
+void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new);
 
 /* MIR printing */
 
diff --git a/src/panfrost/midgard/mir.c b/src/panfrost/midgard/mir.c
index 6adc1350c0a..c606cb3ddf7 100644
--- a/src/panfrost/midgard/mir.c
+++ b/src/panfrost/midgard/mir.c
@@ -23,16 +23,22 @@
 
 #include "compiler.h"
 
+void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new)
+{
+        if (ins->ssa_args.src0 == old)
+                ins->ssa_args.src0 = new;
+
+        if (ins->ssa_args.src1 == old &&
+            !ins->ssa_args.inline_constant)
+                ins->ssa_args.src1 = new;
+}
+
+
 void
 mir_rewrite_index_src(compiler_context *ctx, unsigned old, unsigned new)
 {
         mir_foreach_instr_global(ctx, ins) {
-                if (ins->ssa_args.src0 == old)
-                        ins->ssa_args.src0 = new;
-
-                if (ins->ssa_args.src1 == old &&
-                    !ins->ssa_args.inline_constant)
-                        ins->ssa_args.src1 = new;
+                mir_rewrite_index_src_single(ins, old, new);
         }
 }