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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 - Regression from r313116: gvn-hoist incorrectly erases load"
href="https://bugs.llvm.org/show_bug.cgi?id=35222">35222</a>
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<th>Summary</th>
<td>Regression from r313116: gvn-hoist incorrectly erases load
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>efriedma@codeaurora.org
</td>
</tr>
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<th>CC</th>
<td>dberlin@dberlin.org, hiraditya@msn.com, llvm-bugs@lists.llvm.org
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<pre>Testcase follows. With "opt -gvn-hoist", the second load gets erased (which is
wrong because @pqdownheap could modify the global).
; ModuleID = 'gvn-hoist-test.ll'
source_filename = "gvn-hoist-test.ll"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
@heap = external global i32, align 4
define i32 @build_tree() unnamed_addr {
entry:
br label %do.body
do.body: ; preds = %do.body, %entry
%tmp9 = load i32, i32* @heap, align 4
%cmp = call i1 @pqdownheap(i32 %tmp9)
br i1 %cmp, label %do.body, label %do.end
do.end: ; preds = %do.body
%tmp20 = load i32, i32* @heap, align 4
ret i32 %tmp20
}
declare i1 @pqdownheap(i32)</pre>
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