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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 - llvm.experimental.vector.reduce.{fmin,fmax} broken on Mips"
href="https://bugs.llvm.org/show_bug.cgi?id=38287">38287</a>
</td>
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<tr>
<th>Summary</th>
<td>llvm.experimental.vector.reduce.{fmin,fmax} broken on Mips
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<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>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dragan.mladjenovic@rt-rk.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20596" name="attach_20596" title="Reproducer">attachment 20596</a> <a href="attachment.cgi?id=20596&action=edit" title="Reproducer">[details]</a></span>
Reproducer
Running the attached reproducer on trunk after rL332358 results in error:
LLVM ERROR: Cannot select: 0x55877f48eda0: v2i64 = setcc 0x55877f48ed38,
0x55877f48f218, setlt:ch
0x55877f48ed38: v2f64 = bitcast 0x55877f48f350
0x55877f48f350: v2i64 = insert_vector_elt 0x55877f48f280, 0x55877f48ec68,
Constant:i32<1>
0x55877f48f280: v2i64 = insert_vector_elt 0x55877f48ecd0, 0x55877f48eb98,
Constant:i32<0>
0x55877f48ecd0: v2i64 = BUILD_VECTOR Constant:i64<0>, Constant:i64<0>
0x55877f48f010: i64 = Constant<0>
0x55877f48f010: i64 = Constant<0>
0x55877f48eb98: i64,ch = CopyFromReg 0x55877f429508, Register:i64 %0
0x55877f48eb30: i64 = Register %0
0x55877f48ef40: i32 = Constant<0>
0x55877f48ec68: i64,ch = CopyFromReg 0x55877f429508, Register:i64 %1
0x55877f48ec00: i64 = Register %1
0x55877f48f2e8: i32 = Constant<1>
0x55877f48f218: v2f64 = bitcast 0x55877f48efa8
0x55877f48efa8: v2i64 = BUILD_VECTOR 0x55877f48ec68, 0x55877f48ec68
0x55877f48ec68: i64,ch = CopyFromReg 0x55877f429508, Register:i64 %1
0x55877f48ec00: i64 = Register %1
0x55877f48ec68: i64,ch = CopyFromReg 0x55877f429508, Register:i64 %1
0x55877f48ec00: i64 = Register %1
Before the rL332358 the 'setcc setolt' wasn't replaced with 'setcc setlt' which
Mips backend can't select on v2f64 types.
Possibly a second issue is that reduction expansion produces same 'fcmp fast
olt' even when intrinsic is not used in fastmath context.
*** IR Dump After Expand reduction intrinsics ***
; Function Attrs: uwtable
define double @test(<2 x double>) unnamed_addr #0 {
start:
%rdx.shuf = shufflevector <2 x double> %0, <2 x double> undef, <2 x i32> <i32
1, i32 undef>
%rdx.minmax.cmp = fcmp fast olt <2 x double> %0, %rdx.shuf
%rdx.minmax.select = select <2 x i1> %rdx.minmax.cmp, <2 x double> %0, <2 x
double> %rdx.shuf
%1 = extractelement <2 x double> %rdx.minmax.select, i32 0
ret double %1
}</pre>
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