https://bugs.llvm.org/show_bug.cgi?id=37425
Bug ID: 37425
Summary: unable to use variable assignment in integrated
assembler
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ndesaulni...@google.com
CC: isanb...@gmail.com, jykni...@google.com,
llvm-bugs@lists.llvm.org, nir...@google.com,
pir...@google.com, srhi...@google.com
Blocks: 4068
Created attachment 20296
--> https://bugs.llvm.org/attachment.cgi?id=20296&action=edit
test.S
$ cat test.S
var_xdata = %rcx
xorq var_xdata, var_xdata
$ gcc -c test.S
$ objdump -D test.o
test.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: 48 31 c9 xor %rcx,%rcx
$ clang -c test.S
test.S:1:13: error: unknown token in expression
var_xdata = %rcx
^
test.S:1:13: error: missing expression
var_xdata = %rcx
^
test.S:3:17: error: invalid operand for instruction
xorq var_xdata, var_xdata
^
This is visible while trying to use llvm's integrated assembler to assemble the
linux kernel, particularly:
arch/x86/crypto/aes_ctrby8_avx-x86_64.S
arch/x86/crypto/aesni-intel_avx-x86_64.S
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=4068
[Bug 4068] [Meta] Compiling the Linux kernel with clang
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