================
@@ -0,0 +1,78 @@
+# RUN: llc %s --start-after=livedebugvalues --dwarf-use-key-instructions
--filetype=obj -o - \
+# RUN: | llvm-objdump -d - --no-show-raw-insn \
+# RUN: | FileCheck %s --check-prefix=OBJ
+
+# RUN: llc %s --start-after=livedebugvalues --dwarf-use-key-instructions
--filetype=obj -o - \
+# RUN: | llvm-dwarfdump - --debug-line \
+# RUN: | FileCheck %s --check-prefix=DBG
+
+# OBJ: 0000000000000000 <_Z1fPiii>:
+# OBJ-NEXT: 0: movl $0x0, %ebx
+# OBJ-NEXT: 5: movl $0x1, %ebx
+# OBJ-NEXT: a: movl $0x2, %ebx
+# OBJ-NEXT: f: movl $0x3, %ebx
+# OBJ-NEXT: 14: movl $0x4, %eax
+# OBJ-NEXT: 19: movl $0x5, %eax
+# OBJ-NEXT: 1e: movl $0x6, %eax
+# OBJ-NEXT: 23: movl $0x7, %eax
+# OBJ-NEXT: 28: retq
+
+# DBG: Address Line Column File ISA Discriminator OpIndex
Flags
+# DBG-NEXT: ------------------ ------ ------ ------ --- ------------- -------
-------------
+# DBG-NEXT: 0x0000000000000000 1 0 0 0 0 0
is_stmt prologue_end
+# DBG-NEXT: 0x0000000000000005 2 0 0 0 0 0
is_stmt
+# DBG-NEXT: 0x000000000000000a 2 0 0 0 0 0
+# DBG-NEXT: 0x000000000000000f 2 0 0 0 0 0
+# DBG-NEXT: 0x0000000000000014 2 0 0 0 0 0
+# DBG-NEXT: 0x0000000000000019 2 0 0 0 0 0
+# DBG-NEXT: 0x000000000000001e 2 0 0 0 0 0
is_stmt
+# DBG-NEXT: 0x0000000000000023 2 0 0 0 0 0
is_stmt
+# DBG-NEXT: 0x0000000000000029 2 0 0 0 0 0
is_stmt end_sequence
+
+## Check that interleaving atoms on the same line still produces reasonable
+## is_stmt placement (the is_stmts want to "float up" to the first instruction
+## in a contiguous set with the same line, but we don't let them float past
+## other atom groups).
+
+--- |
+ target triple = "x86_64-unknown-linux-gnu"
+
+ define hidden noundef i32 @_Z1fPiii(ptr %a, i32 %b, i32 %c, i1 %cond)
local_unnamed_addr !dbg !5 {
+ entry:
+ ret i32 2
+ }
+
+ !llvm.dbg.cu = !{!0}
+ !llvm.module.flags = !{!2, !3}
+ !llvm.ident = !{!4}
+
+ !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_17, file: !1,
producer: "clang version 19.0.0", isOptimized: true, runtimeVersion: 0,
emissionKind: LineTablesOnly, splitDebugInlining: false, nameTableKind: None)
+ !1 = !DIFile(filename: "test.cpp", directory: "/")
+ !2 = !{i32 7, !"Dwarf Version", i32 5}
+ !3 = !{i32 2, !"Debug Info Version", i32 3}
+ !4 = !{!"clang version 19.0.0"}
+ !5 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type:
!6, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags:
DISPFlagDefinition | DISPFlagOptimized, unit: !0)
+ !6 = !DISubroutineType(types: !7)
+ !7 = !{}
+ !8 = !DILocalVariable(name: "x", scope: !5, file: !1, line: 1, type: !7)
+
+...
+---
+name: _Z1fPiii
+alignment: 16
+body: |
+ bb.0.entry:
+ $ebx = MOV32ri 0, debug-location !DILocation(line: 1, scope: !5)
+ ;; is_stmt floats up here from mov 3.
+ $ebx = MOV32ri 1, debug-location !DILocation(line: 2, scope: !5,
atomGroup: 1, atomRank: 1)
+ $ebx = MOV32ri 2, debug-location !DILocation(line: 2, scope: !5,
atomGroup: 1, atomRank: 2)
+ $ebx = MOV32ri 3, debug-location !DILocation(line: 2, scope: !5,
atomGroup: 1, atomRank: 1)
+ $eax = MOV32ri 4, debug-location !DILocation(line: 2, scope: !5)
+ $eax = MOV32ri 5, debug-location !DILocation(line: 2, scope: !5,
atomGroup: 2, atomRank: 1)
----------------
jmorse wrote:
My understanding is that this instruction should get an is_stmt in its own
entry because it's a separate span of atom group 2, is that right? But doesn't
(address 0x19 above?) as far as I can tell.
https://github.com/llvm/llvm-project/pull/133495
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