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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 --- - wrong code generated for monotonic loads and stores"
href="https://llvm.org/bugs/show_bug.cgi?id=25171">25171</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code generated for monotonic loads and stores
</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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@d = global double 0.000000e+00, align 8
define void @_Z1fv() #0 {
entry:
%0 = load atomic i64, i64* bitcast (double* @d to i64*) monotonic, align 8
%1 = bitcast i64 %0 to double
%add = fadd double %1, 1.000000e+00
%2 = bitcast double %add to i64
store atomic i64 %2, i64* bitcast (double* @d to i64*) monotonic, align 8
ret void
}
attributes #0 = { nounwind uwtable "disable-tail-calls"="false"
"less-precise-fpmad"="false" "no-frame-pointer-elim"="false"
"no-infs-fp-math"="false" "no-nans-fp-math"="false"
"stack-protector-buffer-size"="8" "target-cpu"="x86-64"
"target-features"="+mmx,+sse,+sse2" "unsafe-fp-math"="false"
"use-soft-float"="false" }
Generates:
_Z1fv: # @_Z1fv
movsd .LCPI0_0(%rip), %xmm0 # xmm0 = mem[0],zero
addsd (%rip), %xmm0
movsd %xmm0, (%rip)
retq
Instead of loading and storing @d, we load and store over random instructions
within 'f'.</pre>
</div>
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