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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Partial inliner doesn't set up correct debug info which causes LTO to fail"
href="https://bugs.llvm.org/show_bug.cgi?id=35288">35288</a>
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<th>Summary</th>
<td>Partial inliner doesn't set up correct debug info which causes LTO to fail
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Interprocedural Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eastig@yandex.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>The partial inliner does not set up debug info for instructions it has inlined.
During LTO a decision is made to inline a function the partial inliner created.
LTO has Verifier enabled. Verifier finds the resulted code does not have
correct debug info. This cause LTO to fail.
Reproducer:
$ cat test.c
int a02(int);
int a01(int v) {
v = v * 100;
return a02(v);
}
int a02(int v) {
if (v > 2000)
v *= 10;
v += 200;
return v;
}
$ clang -c -O3 -mthumb --target=arm-arm-none-eabi -mcpu=cortex-m7 test.c -g -S
-emit-llvm -mllvm -disable-llvm-optzns
$ opt -S -o test.pi.ll -partial-inliner test.ll
-skip-partial-inlining-cost-analysis=true
$ opt -S -o test.i.ll -inline test.pi.ll
!dbg attachment points at wrong subprogram for function
!8 = distinct !DISubprogram(name: "a01", scope: !1, file: !1, line: 3, type:
!9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped,
isOptimized: true, unit: !0, variables: !12)
i32 (i32)* @a01
%4 = load i32, i32* %v.addr.i, align 4, !dbg !32, !tbaa !19
!32 = !DILocation(line: 10, column: 7, scope: !29)
!29 = distinct !DILexicalBlock(scope: !15, file: !1, line: 9, column: 7)
!15 = distinct !DISubprogram(name: "a02", scope: !1, file: !1, line: 8, type:
!9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped,
isOptimized: true, unit: !0, variables: !16)
LLVM ERROR: Broken module found, compilation aborted!
---------
'test.c', 'test.ll' and 'test.pi.ll' are attached.</pre>
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