[llvm-branch-commits] [llvm] [KeyInstr][debugify] Add --debugify-atoms to add key instructions metadata (PR #133483)

[Orlando Cazalet-Hyams via llvm-branch-commits]

https://github.com/OCHyams created 
https://github.com/llvm/llvm-project/pull/133483

None

>From b848c421338a93c1d031f3038f81b538eac33aab Mon Sep 17 00:00:00 2001
From: Orlando Cazalet-Hyams <orlando.hy...@sony.com>
Date: Mon, 24 Mar 2025 15:53:27 +0000
Subject: [PATCH] [KeyInstr][debugify] Add --debugify-atoms to add key
 instructions metadata

---
 llvm/lib/Transforms/Utils/Debugify.cpp | 11 +++++++++--
 llvm/test/DebugInfo/debugify.ll        | 10 ++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Transforms/Utils/Debugify.cpp 
b/llvm/lib/Transforms/Utils/Debugify.cpp
index e6b5e267d192b..02c7d7f2f10ed 100644
--- a/llvm/lib/Transforms/Utils/Debugify.cpp
+++ b/llvm/lib/Transforms/Utils/Debugify.cpp
@@ -35,6 +35,8 @@ using namespace llvm;
 
 namespace {
 
+cl::opt<bool> ApplyAtomGroups("debugify-atoms", cl::init(false));
+
 cl::opt<bool> Quiet("debugify-quiet",
                     cl::desc("Suppress verbose debugify output"));
 
@@ -142,8 +144,13 @@ bool llvm::applyDebugifyMetadata(
 
     for (BasicBlock &BB : F) {
       // Attach debug locations.
-      for (Instruction &I : BB)
-        I.setDebugLoc(DILocation::get(Ctx, NextLine++, 1, SP));
+      for (Instruction &I : BB) {
+        uint64_t AtomGroup = ApplyAtomGroups ? NextLine : 0;
+        uint8_t AtomRank = ApplyAtomGroups ? 1 : 0;
+        uint64_t Line = NextLine++;
+        I.setDebugLoc(DILocation::get(Ctx, Line, 1, SP, nullptr, false,
+                                      AtomGroup, AtomRank));
+      }
 
       if (DebugifyLevel < Level::LocationsAndVariables)
         continue;
diff --git a/llvm/test/DebugInfo/debugify.ll b/llvm/test/DebugInfo/debugify.ll
index 191015f825933..269a301ce830c 100644
--- a/llvm/test/DebugInfo/debugify.ll
+++ b/llvm/test/DebugInfo/debugify.ll
@@ -1,6 +1,9 @@
 ; RUN: opt -passes=debugify -S -o - < %s | FileCheck %s
 ; RUN: opt -passes=debugify -S -o - < %s | FileCheck %s
 
+; RUN: opt -passes=debugify --debugify-atoms -S -o - < %s \
+; RUN: | FileCheck %s -check-prefixes=CHECK-ATOMS
+
 ; RUN: opt -passes=debugify,debugify -S -o - < %s 2>&1 | \
 ; RUN:   FileCheck %s -check-prefix=CHECK-REPEAT
 ; RUN: opt -passes=debugify,debugify -S -o - < %s 2>&1 | \
@@ -101,6 +104,13 @@ define i32 @boom() {
 ; CHECK-DAG: ![[musttail]] = !DILocation(line: 5, column: 1
 ; CHECK-DAG: ![[musttailRes]] = !DILocation(line: 6, column: 1
 
+; CHECK-ATOMS-DAG: !DILocation(line: 1{{.*}}, atomGroup: 1, atomRank: 1
+; CHECK-ATOMS-DAG: !DILocation(line: 2{{.*}}, atomGroup: 2, atomRank: 1
+; CHECK-ATOMS-DAG: !DILocation(line: 3{{.*}}, atomGroup: 3, atomRank: 1
+; CHECK-ATOMS-DAG: !DILocation(line: 4{{.*}}, atomGroup: 4, atomRank: 1
+; CHECK-ATOMS-DAG: !DILocation(line: 5{{.*}}, atomGroup: 5, atomRank: 1
+; CHECK-ATOMS-DAG: !DILocation(line: 6{{.*}}, atomGroup: 6, atomRank: 1
+
 ; --- DILocalVariables
 ; CHECK-DAG: ![[TY32:.*]] = !DIBasicType(name: "ty32", size: 32, encoding: 
DW_ATE_unsigned)
 ; CHECK-DAG: !DILocalVariable(name: "1", scope: {{.*}}, file: {{.*}}, line: 1, 
type: ![[TY32]])

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