[llvm-branch-commits] [llvm] release/23.x: [X86] Skip debug instructions in tile copy lowering (#209640) (PR #209706)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: llvmbot

<details>
<summary>Changes</summary>

Backport 3e4160fdc3d5bb0ed86480604bdfcd3130e7dd37

Requested by: @<!-- -->nikic

---
Full diff: https://github.com/llvm/llvm-project/pull/209706.diff


2 Files Affected:

- (modified) llvm/lib/Target/X86/X86LowerTileCopy.cpp (+2) 
- (added) llvm/test/CodeGen/X86/AMX/pr209512.ll (+28) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86LowerTileCopy.cpp b/llvm/lib/Target/X86/X86LowerTileCopy.cpp
index e5a374dfcc0b6..628f691279600 100644
--- a/llvm/lib/Target/X86/X86LowerTileCopy.cpp
+++ b/llvm/lib/Target/X86/X86LowerTileCopy.cpp
@@ -87,6 +87,8 @@ static bool lowerTileCopy(MachineFunction &MF) {
     LiveRegUnits UsedRegs(*TRI);
     UsedRegs.addLiveOuts(MBB);
     for (MachineInstr &MI : llvm::make_early_inc_range(reverse(MBB))) {
+      if (MI.isDebugInstr())
+        continue;
       UsedRegs.stepBackward(MI);
       if (!MI.isCopy())
         continue;
diff --git a/llvm/test/CodeGen/X86/AMX/pr209512.ll b/llvm/test/CodeGen/X86/AMX/pr209512.ll
new file mode 100644
index 0000000000000..975aa5c1e5f6c
--- /dev/null
+++ b/llvm/test/CodeGen/X86/AMX/pr209512.ll
@@ -0,0 +1,28 @@
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+amx-int8 -mattr=+avx512f -verify-machineinstrs -o /dev/null
+
+define void @test_debug_instr(ptr %arg) #0 !dbg !4 {
+  #dbg_declare(ptr %arg, !12, !DIExpression(), !15)
+  %1 = call x86_amx @llvm.x86.cast.vector.to.tile.v1024i8(<1024 x i8> zeroinitializer)
+  %2 = call x86_amx @llvm.x86.tdpbssd.internal(i16 0, i16 0, i16 0, x86_amx %1, x86_amx %1, x86_amx %1)
+  ret void
+}
+
+declare x86_amx @llvm.x86.cast.vector.to.tile.v1024i8(<1024 x i8>) #1
+declare x86_amx @llvm.x86.tdpbssd.internal(i16, i16, i16, x86_amx, x86_amx, x86_amx) #2
+
+attributes #0 = { "target-features"="+amx-int8" }
+attributes #1 = { nocallback nofree nosync nounwind willreturn memory(none) }
+attributes #2 = { nounwind }
+
+!llvm.module.flags = !{!0}
+!llvm.dbg.cu = !{!1}
+
+!0 = !{i32 2, !"Debug Info Version", i32 3}
+!1 = distinct !DICompileUnit(language: DW_LANG_C11, file: !2, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, nameTableKind: None)
+!2 = !DIFile(filename: "test.c", directory: "/tmp")
+!3 = !{}
+!4 = distinct !DISubprogram(name: "test_debug_instr", linkageName: "test_debug_instr", scope: !2, file: !2, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !3)
+!9 = distinct !DISubroutineType(types: !3)
+!12 = distinct !DILocalVariable(name: "a", arg: 1, scope: !4, file: !2, line: 1, type: !13)
+!13 = !DICompositeType(tag: DW_TAG_structure_type, name: "__tile1024i", scope: !4, file: !2, size: 16384, align: 8192, flags: DIFlagPublic, elements: !3, identifier: "__tile1024i")
+!15 = !DILocation(line: 1, column: 1, scope: !4)

``````````

</details>


https://github.com/llvm/llvm-project/pull/209706