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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 - [PPC] wrong code generated for ppc_fp128 sign testing"
href="https://bugs.llvm.org/show_bug.cgi?id=45475">45475</a>
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<th>Summary</th>
<td>[PPC] wrong code generated for ppc_fp128 sign testing
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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>Linux
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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
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<th>Component</th>
<td>Backend: PowerPC
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>carrot@google.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, nemanja.i.ibm@gmail.com
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<p>
<div>
<pre>Compile the following code with command line
llc --mtriple=powerpc64le-grtev4-linux-gnu t.ll
define zeroext i1 @ppc128(ppc_fp128 %fp) {
%v128 = bitcast ppc_fp128 %fp to i128
%low = trunc i128 %v128 to i64
%shift = lshr i128 %v128, 64
%high = trunc i128 %shift to i64
%c = icmp slt i64 %high, 0 // %c = icmp slt i64 %low, 0
ret i1 %c
}
LLVM generates:
li 3, 0
blr
If I testing the sign of the %low part as in comment, llvm generates the same
code.
In both cases I expect llvm generate bit extraction instructions.</pre>
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