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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 - [NewGVN] Store-to-Load forwarding failure if load is of different type"
href="https://bugs.llvm.org/show_bug.cgi?id=32446">32446</a>
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<th>Summary</th>
<td>[NewGVN] Store-to-Load forwarding failure if load is of different type
</td>
</tr>
<tr>
<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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>keno@alumni.harvard.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider:
```
define i64 @foo(double %bar) {
%slot = alloca double
store double %bar, double *%slot
%bcast = bitcast double *%slot to i64*
%ival = load i64, i64* %bcast
ret i64 %ival
}
```
With regular GVN:
$ opt -gvn -dse simple.ll -S
; ModuleID = 'simple.ll'
source_filename = "simple.ll"
define i64 @foo(double %bar) {
%1 = bitcast double %bar to i64
ret i64 %1
}
NewGVN:
define i64 @foo(double %bar) {
%slot = alloca double
store double %bar, double* %slot
%bcast = bitcast double* %slot to i64*
%ival = load i64, i64* %bcast
ret i64 %ival
}</pre>
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</p>
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