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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - integrated assembler has poor diagnostics"
href="https://llvm.org/bugs/show_bug.cgi?id=25720">25720</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>integrated assembler has poor diagnostics
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<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: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</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>When trying to build boringssl with clang's integrated assembler, it complains
about this:
thakis@thakis:~/src/chrome/src$ cat arm.S
.fpu neon
.text
.align 4
.global foo
.hidden foo
.type foo, %function
and sp, sp, #0xffffffe0
thakis@thakis:~/src/chrome/src$
third_party/llvm-build/Release+Asserts/bin/clang -c arm.S -march=armv7-a
-target arm-linux-androideab
arm.S:7:14: error: invalid operand for instruction
and sp, sp, #0xffffffe0
^
gas accepts this without complaints and converts it into a BIC instruction (a
and not b), as ~0xffffffe0 = 1f fits into the 8bit unshifted immediate. The
integrated assembler should do this too:
thakis@thakis:~/src/chrome/src$
third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
-c arm.S
thakis@thakis:~/src/chrome/src$
third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-objdump
-D -marm arm.o
arm.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <.text>:
0: e3cdd01f bic sp, sp, #31
4: e1a00000 nop ; (mov r0, r0)
8: e1a00000 nop ; (mov r0, r0)
c: e1a00000 nop ; (mov r0, r0)</pre>
</div>
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