[PATCH] D151863: [x86][MC] Fix movdir64b addressing

[Akshay Khadse via Phabricator via cfe-commits]

akshaykhadse added inline comments.


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Comment at: llvm/test/MC/X86/x86-64-movdir64b-intel.s:1
+// RUN: llvm-mc -triple x86_64-unknown-unknown -x86-asm-syntax=intel -output-asm-variant=1 --show-encoding %s | FileCheck %s
+// CHECK: movdir64b rax, zmmword ptr [rax - 4096]
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skan wrote:
> The test can pass w/o this patch. I think we should replace it with IR test (llc) here, the input should be the diff in ms-inline-asm-64.c.
It is better to remove this as it does not add any value.

We cannot write a llc test for this because:
  - If input IR is `call ... "movdir64b eax, ZMMWORD PTR arr ..."`, the generated assembly will be `movdir64b arr, %rax"
  - If input IR is `call ... "movdir64b eax, ZMMWORD PTR $0 ..."`, the generated assembly will be `movdir64b -4016(%rbp), %rax"

In other words, it's responsibility of front-end to generate the correct IR. If the IR is not correct, the back-end will not fix it and incorrect assembly will be generated.



Repository:
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  https://reviews.llvm.org/D151863/new/

https://reviews.llvm.org/D151863