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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - riscv - error in backend: Cannot select: 0x55d7f7ff1300: f32 = fcopysign 0x55d7f7ff1c58, 0x55d7f7fe9fb8"
href="https://bugs.llvm.org/show_bug.cgi?id=43040">43040</a>
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<th>Summary</th>
<td>riscv - error in backend: Cannot select: 0x55d7f7ff1300: f32 = fcopysign 0x55d7f7ff1c58, 0x55d7f7fe9fb8
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>9.0
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>raj.khem@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Created <span class=""><a href="attachment.cgi?id=22391" name="attach_22391" title="test case">attachment 22391</a> <a href="attachment.cgi?id=22391&action=edit" title="test case">[details]</a></span>
test case
When compiling mesa with clang for riscv64 following error is seen
fatal error: error in backend: Cannot select: 0x55d7f7ff1300: f32 = fcopysign
0x55d7f7ff1c58, 0x55d7f7fe9fb8,
src/compiler/nir/nir_constant_expressions.c:15563:10 @[
src/compiler/nir/nir_constant_expressions.c:20612:14 ]
0x55d7f7ff1c58: f32,ch = load<(load 4 from constant-pool)> 0x55d7f74dc958,
0x55d7f8206180, undef:i64
0x55d7f8206180: i64 = PseudoLLA TargetConstantPool:i64<float 0.000000e+00>
0
0x55d7f7ff1d90: i64 = TargetConstantPool<float 0.000000e+00> 0
0x55d7f8206048: i64 = undef
0x55d7f7fe9fb8: f64,ch = CopyFromReg 0x55d7f74dc958, Register:f64 %2081,
src/compiler/nir/nir_constant_expressions.c:15563:26 @[
src/compiler/nir/nir_constant_expressions.c:20612:14 ]
0x55d7f8205a98: f64 = Register %2081
In function: nir_eval_const_opcode
clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 9.0.0 (<a href="https://github.com/llvm/llvm-project">https://github.com/llvm/llvm-project</a>
150ad3120e346ed8dff2bdda458a72e734b1879a)
Target: riscv64-yoe-linux</pre>
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