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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Inliner fails with negative threshholds"
href="https://llvm.org/bugs/show_bug.cgi?id=26495">26495</a>
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<th>Summary</th>
<td>Inliner fails with negative threshholds
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Interprocedural Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>hans@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>david.majnemer@gmail.com, eraman@google.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>David reported on IRC the other week that we fail to inline g into f and f into
h here:
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc"
define void @h(i8* nocapture readnone %this) {
entry:
call void @f(i8* %this)
unreachable
}
define linkonce_odr void @f(i8* nocapture readnone %this) {
entry:
tail call void @g(i8* %this)
unreachable
}
define linkonce_odr void @g(i8* nocapture readnone %this) {
entry:
br label %for.cond
for.cond:
tail call void @foo(i32 1)
br label %for.cond
}
declare void @foo(i32)
$ bin/opt -inline /tmp/a.ll -S -debug
[..]
Analyzing call of g...
NumConstantArgs: 0
NumConstantOffsetPtrArgs: 1
NumAllocaArgs: 0
NumConstantPtrCmps: 0
NumConstantPtrDiffs: 0
NumInstructionsSimplified: 1
NumInstructions: 2
SROACostSavings: 0
SROACostSavingsLost: 0
ContainsNoDuplicateCall: 0
Cost: 30
Threshold: -337
NOT Inlining: cost=30, thres=-337, Call: tail call void @g(i8* %this)
Inliner visiting SCC: h: 1 call sites.
Analyzing call of f...
NumConstantArgs: 0
NumConstantOffsetPtrArgs: 1
NumAllocaArgs: 0
NumConstantPtrCmps: 0
NumConstantPtrDiffs: 0
NumInstructionsSimplified: 0
NumInstructions: 1
SROACostSavings: 0
SROACostSavingsLost: 0
ContainsNoDuplicateCall: 0
Cost: 30
Threshold: -337
NOT Inlining: cost=30, thres=-337, Call: call void @f(i8* %this)</pre>
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