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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Sink instructions to their earliest usage site"
href="https://bugs.llvm.org/show_bug.cgi?id=47170">47170</a>
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<th>Summary</th>
<td>Sink instructions to their earliest usage site
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
<tr>
<th>Reporter</th>
<td>hiraditya@msn.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>GVNSink can be improved to have this optimization.
<a href="https://reviews.llvm.org/D37762">https://reviews.llvm.org/D37762</a>
Test case from the patch:
```
define i32 @test4(i1 %C, i1 %D, i1 %E, i32 %A) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: br i1 [[C:%.*]], label [[THEN:%.*]], label [[ENDIF:%.*]]
; CHECK: then:
; CHECK-NEXT: [[OR1:%.*]] = or i32 [[A:%.*]], 65537
; CHECK-NEXT: [[SELECT1:%.*]] = select i1 [[D:%.*]], i32 [[OR1]], i32 [[A]]
; CHECK-NEXT: [[OR2:%.*]] = or i32 [[SELECT1]], 131074
; CHECK-NEXT: [[SELECT2:%.*]] = select i1 [[E:%.*]], i32 [[OR2]], i32
[[SELECT1]]
; CHECK-NEXT: ret i32 [[SELECT2]]
; CHECK: endif:
; CHECK-NEXT: ret i32 [[A]]
;
%or1 = or i32 %A, 65537
%select1 = select i1 %D, i32 %or1, i32 %A
%or2 = or i32 %select1, 131074
%select2 = select i1 %E, i32 %or2, i32 %select1
br i1 %C, label %then, label %endif
then:
ret i32 %select2
endif:
ret i32 %A
}
```</pre>
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