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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - NewGVN misses a load coercion opportunity"
href="https://bugs.llvm.org/show_bug.cgi?id=34036">34036</a>
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<th>Summary</th>
<td>NewGVN misses a load coercion opportunity
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>davide@freebsd.org
</td>
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dberlin@dberlin.org, filcab@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, simon.f.whittaker@gmail.com
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<pre>This is one of the blockers to get NewGVN on by default.
I'm going to look at this soon, opening a bug in case I get sidetracked in
other activities.
The gist is that we should remove the load sandwiched between the two stores,
and currently we don't.
; ModuleID = 'pr10820.ll'
source_filename = "pr10820.ll"
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
@g = external global i31
; Function Attrs: nounwind uwtable
define void @main() #0 {
entry:
store i32 402662078, i32* bitcast (i31* @g to i32*), align 8
%0 = load i31, i31* @g, align 8
store i31 %0, i31* undef, align 1
unreachable
}
attributes #0 = { nounwind uwtable }</pre>
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