<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/140904>140904</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [LoongArch] Assertion failure 'MachineOperand::getIndex() const: (isFI() || isCPI() || isTargetIndex() || isJTI()) && "Wrong MachineOperand accessor"' failed.'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            llvm:crash,
            backend:loongarch
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            heiher
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          heiher
      </td>
    </tr>
</table>

<pre>
    While building the Linux kernel for the LoongArch using Clang, the following assertion failure occurs:

```
llvm/include/llvm/CodeGen/MachineOperand.h:572: int llvm::MachineOperand::getIndex() const: Assertion (isFI() || isCPI() || isTargetIndex() || isJT
I()) && "Wrong MachineOperand accessor"' failed.
```

This happens when compiling the file `drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c`.

Clang invocation:

```sh
clang -Wp,-MMD,drivers/net/wireless/realtek/rtlwifi/rtl8821ae/.phy.o.d -nostdinc -I./arch/loongarch/include -I./arch/loongarch/include/generated -I./include -I./include -I./arch/loongarch/include/uapi -I./arch/loongarch/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/compiler-version.h -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ --target=loongarch64-linux-gnusf -fintegrated-as -Werror=unknown-warning-option -Werror=ignored-optimization-argument -Werror=option-ignored -Werror=unused-command-line-argument -DCC_USING_PATCHABLE_FUNCTION_ENTRY -DVMLINUX_LOAD_ADDRESS=0x9000000000200000 -std=gnu11 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -mno-relax -mannotate-tablejump -mabi=lp64s -mcmodel=normal -pipe -msoft-float -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset -fno-asynchronous-unwind-tables -mstrict-align -isystem /tmp/rel/lib/clang/21/include -fno-delete-null-pointer-checks -O2 -fstack-protector-strong -ftrivial-auto-var-init=zero -fpatchable-function-entry=2 -fstrict-flex-arrays=3 -fno-strict-overflow -fno-stack-check -fno-builtin-wcslen -Wall -Wextra -Wundef -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Werror=strict-prototypes -Wno-format-security -Wno-trigraphs -Wno-frame-address -Wno-address-of-packed-member -Wmissing-declarations -Wmissing-prototypes -Wframe-larger-than=2048 -Wno-gnu -Wno-format-overflow-non-kprintf -Wno-format-truncation-non-kprintf -Wno-default-const-init-unsafe -Wvla -Wno-pointer-sign -Wcast-function-type -Wno-unterminated-string-initialization -Wimplicit-fallthrough -Werror=date-time -Werror=incompatible-pointer-types -Wenum-conversion -Wunused -Wno-unused-but-set-variable -Wno-unused-const-variable -Wno-format-overflow -Wno-override-init -Wno-pointer-to-enum-cast -Wno-tautological-constant-out-of-range-compare -Wno-unaligned-access -Wno-enum-compare-conditional -Wno-missing-field-initializers -Wno-type-limits -Wno-shift-negative-value -Wno-enum-enum-conversion -Wno-sign-compare -Wno-unused-parameter -g -DMODULE -fno-direct-access-external-data -DKBUILD_BASENAME=\"phy\" -DKBUILD_MODNAME=\"rtl8821ae\" -D__KBUILD_MODNAME=kmod_rtl8821ae -c -o drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.o drivers/net/wireless/realtek/rtlwifi/rtl8821ae/phy.c
```

Clang version:

```
clang version 21.0.0git (https://github.com/llvm/llvm-project 1a08aa2680da76258a2f8252ab63d05e5638b9da)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /tmp/rel/bin
Build config: +assertions
```

Linux kernel version:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tag/?h=v6.15-rc7

Kernel config:

`arch/loongarch/configs/loongson3_defconfig`
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJysV11z4yoS_TXkhcIlI3_lIQ-KFd_N3nxMzWQ2u08uDC2JGwQqQE5yf_1WIzmxk6mdmpq9lbojN6ehORyabhGCri3ABZlfEs4b0A14wjmZl2eij43zF4PtbOfU68Vjow3QXa-N0ramsQF6o23_Qp_AWzC0cn4wOmfrwsuG9gGBayNsTfg6DVbOGPeMZhEC-KidpZXQpvdAnZS9DyQvSJb-Ftn4lxXG7FvCN9pK0ysgfDMa1k7BH2AJ39wK2WgL9x14YdWkIXkxX3KSF1TbSBM8L0henOIGWw3x2ip4IXxF-DmVzoaInsVbiISvdNhcjwCyXJPlmuqw_vLJ9CD8h-nehv75QLJidEgDfEH4ghLOH72zNT0NjQopIQSXToQvE0ugJh-IIVnx0OhAG9F1YAN9bsBS6dpOm8MhVXhsZJEpr_fgA-EbC5HwzbP2YCCgwYMwEZ7wK5pnXenha7XiU4Fsd83rRJJFNhlWTCdKtd07KZCez0cWGpIVMsHYY0f4mt3eloSvfyOGCQbhJooy60JU2krKrieEb4SXDSoCZTd-jzr5KYDwTQ0WvIigRvCp6y9M1ItO_9KCpz4_nOh_eR1CO8UZvJGEbwYJgGdIt3Z20vzM40k6W-n658DD1Nv42kFAfLnd_nn19e7qZruljMV0A0hevu1_MWPJmdW2DxVllbYR6rQdJgJlj-C98yQve_tk3bNlz8JbbWvmunT73gG6ts6DSgOt_jupjwlf9y3YeIQbHNkIP1mhD6CYdG0rrMKw4Mi_XK-3379d3_2x_VI8rP9RXN5cbTff79YP1_d326u7h6__oaz81-3N9d33f29v7otyW5Tl16tv30heZi_n2eE_nv5PWYiK5GVt--mUsio0zkf2LBvhKat6m7KvYuNv61JUuF38_nJ9NXyE6LWMTBgtUjplrXXMgxEvlLXCWhdFBBbFzsBffduhcaeR_W4xC5S1snUKDMlL63wrDGWd7oCyNrgqsso4EYd1MLFHbVkLrexeP9lat4dPxgCjswivVjbeWdcH1ttnbdUQEkbwvoPaUqbDa4jQUsI3se3SxTdJXTvU1vBWbPj0-PLhCgoMRGC2N4Z1DgXkmWxAPgXK7jmyG4V8Yp13EWR0HnnDpMqq6PVeC8NEHx3bC8-01SjPv8E7yqpORNlgqHgkMskGbPSvJC-HaVPwlYEXJrwXr4HkZX5yNG4PvjLu-WDEOFJop3w9y2AAxSyMQUW-RC8oe-ytgupY4m1ntNTxPRwF0ggvPl6FA06fKN9D7L1leDePrGOkyI5L15ayR-tYhZKILIDsvY6vgzF6XXvRNQeMFy0woZSHMJrGH8xVrBPyCRRqYQeessdWB1TpcczhyHwSwDCzwXThWWyERcqz2WpYpLb9SZAHlpl1lj11XttYnQCi7-3wHn2GKKhEbyJLT3sSAOttEBVytDdiAB1kFZJOH6UIR4cwEmod6xHUapvSFxJr6zSjFmbMSJQ9vp-iMCY23vV1c3QeKt1Z3R6fkbaYWUXUqMVDLAeuwPYtRj-m86QbzGSHkFJW2_V4lhFFrlHRJ4PD1k-HPlA7GPGX1wrSpk6ZiY4NgYgwjkS8VcbVWgozLCFsZK6PKA4vbA0s7cq_BZPSACb-VN4M1nF3CYezKI00YrLC0YN4Kg1GvVMNfvRGjpjRrY6jITS6isxCLaLeA9sL08PRQp-5RB9d24-hJt46gTKNqO6asvL2vvx-M6ZmpT1gYks7YfASwVthmBJRUFb-efn9-qbcXhbfru6K2yuSl2S-Jpx3zevw8Y65vS9PIO91zwG43X6CPrVObd-QlEnKHP3NIu-3J5Cf69OhWhzJ_mF1L48RlE8n2SSrdcSqu4mxSy0B32AVpGPT7ybSte8tAP6DeeUvkJFORbYSgi9WmRLLBZ-vBK9WfM7FbpGrbA7zRb7anSuBFXhWPIyVSkFfVovtYsYO9cdbtZLKaw9C0fEVLWjngn7BQh61bgyoUnu0f3jPdtqSrLjEbokOldUAunzre8Jnqk76qY-MfaJiMgAnzuOT2fX4gAbZHtd0CTCgMT7n98KocEBMRrNAf5JvGpKX-8VkOmdeLodF_xxiedvB2-H9oMYdQOFgDc7mWwXV6LvIztRFrs7zc3EGF9PlbLnKF7P58qy5mMN5Ps0WU1gtF_lufg7Zeb6oFlk-W2ULUe3O9AXP-Dyb8-l0li3z5WQ1z2Q1n_HVvBLLnVqSWQat0GaCakBCznQIPVxMZ9l5NjszYgcmjH3u2AtKL0KTeiu8Yjt8x1I_eLSj1An7i6SwXV8HMsuMDjG8rxJ1NKl_fmt6ybw86hsPrS3hy19pPP9P7eZv95p8edZ7c_FrlxArNyQfhTDyv7_g_w0AAP__jg59_g">