[PATCH] D69411: [MC] Parse .if conditions with symbols in consecutive MCDataFragements

Tue Nov 12 11:14:26 PST 2019

jcai19 added a comment.

In D69411#1742501 <https://reviews.llvm.org/D69411#1742501>, @nickdesaulniers wrote:

>

> The case from the kernel is testing that a single instruction is 2B rather than 4B (narrow vs wide).  See https://github.com/ClangBuiltLinux/linux/blob/de620fb99ef2bd52b2c5bc52656e89dcfc0e223a/arch/arm/include/asm/assembler.h#L255-L270.
> 
> I don't see any subarch directives there.

This issue happens when the ALT_UP macro is expanded in files like arch/arm/mm/proc-v7.S. This is how I reproduce the code of interest
clang -I./arch/arm/include -I./arch/arm/include/generated  -I./include -I./arch/arm/include/uapi -I./arch/arm/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h  -D__ASSEMBLY__  --target=arm-linux-gnueabihf -D__LINUX_ARM_ARCH__=7 -march=armv7-a -include asm/unified.h  -S arch/arm/mm/proc-v7.S &> clang-proc-v7.s

Repository:
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https://reviews.llvm.org/D69411