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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - arm64 global isel: LLVM ERROR: unable to legalize instruction: %2:_(s16), %3:_(s1) = G_UADDO %1:_, %4:_ (in function: slice)"
href="https://bugs.llvm.org/show_bug.cgi?id=43981">43981</a>
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<th>Summary</th>
<td>arm64 global isel: LLVM ERROR: unable to legalize instruction: %2:_(s16), %3:_(s1) = G_UADDO %1:_, %4:_ (in function: slice)
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<th>Product</th>
<td>new-bugs
</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
</td>
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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
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>regehr@cs.utah.edu
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, nunoplopes@sapo.pt
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<pre>I'm seeing some crashes when trying to compile small functions to arm64 using
global isel. This is on Ubuntu 18.04 and the LLVM is from Nov 11.
If these bugs aren't interesting please let me know.
$ cat w16r1_1376-stripped.ll
; ModuleID = '<stdin>'
source_filename = "w16r1_1376.ll"
define i64 @slice(i64) {
%2 = trunc i64 %0 to i16
%3 = add nsw i16 %2, 2
%4 = icmp ult i16 %3, %2
%5 = zext i1 %4 to i64
ret i64 %5
}
$ llc -march=arm64 -global-isel w16r1_1376-stripped.ll
LLVM ERROR: unable to legalize instruction: %2:_(s16), %3:_(s1) = G_UADDO %1:_,
%4:_ (in function: slice)
$ llc --version
LLVM (<a href="http://llvm.org/">http://llvm.org/</a>):
LLVM version 10.0.0git
Optimized build.
Default target: x86_64-unknown-linux-gnu
Host CPU: broadwell
Registered Targets:
aarch64 - AArch64 (little endian)
aarch64_32 - AArch64 (little endian ILP32)
aarch64_be - AArch64 (big endian)
amdgcn - AMD GCN GPUs
arm - ARM
arm64 - ARM64 (little endian)
arm64_32 - ARM64 (little endian ILP32)
armeb - ARM (big endian)
bpf - BPF (host endian)
bpfeb - BPF (big endian)
bpfel - BPF (little endian)
hexagon - Hexagon
lanai - Lanai
mips - MIPS (32-bit big endian)
mips64 - MIPS (64-bit big endian)
mips64el - MIPS (64-bit little endian)
mipsel - MIPS (32-bit little endian)
msp430 - MSP430 [experimental]
nvptx - NVIDIA PTX 32-bit
nvptx64 - NVIDIA PTX 64-bit
ppc32 - PowerPC 32
ppc64 - PowerPC 64
ppc64le - PowerPC 64 LE
r600 - AMD GPUs HD2XXX-HD6XXX
riscv32 - 32-bit RISC-V
riscv64 - 64-bit RISC-V
sparc - Sparc
sparcel - Sparc LE
sparcv9 - Sparc V9
systemz - SystemZ
thumb - Thumb
thumbeb - Thumb (big endian)
wasm32 - WebAssembly 32-bit
wasm64 - WebAssembly 64-bit
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
xcore - XCore
$</pre>
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