[llvm] [X86][MC] Support Enc/Dec for EGPR for promoted MOVDIR instruction (PR #74713)

[via llvm-commits]

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@@ -0,0 +1,10 @@
+# RUN: llvm-mc --disassemble %s -triple=x86_64 | FileCheck %s --check-prefixes=ATT
+# RUN: llvm-mc --disassemble %s -triple=x86_64 -x86-asm-syntax=intel --output-asm-variant=1 | FileCheck %s --check-prefixes=INTEL
+
+# ATT:   movdir64b	291(%r28d,%r29d,4), %r18d
+# INTEL: movdir64b	r18d, zmmword ptr [r28d + 4*r29d + 291]
+0x67,0x62,0x8c,0x79,0x08,0xf8,0x94,0xac,0x23,0x01,0x00,0x00
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XinWang10 wrote:

You're right. I introduce a new IC context named IC_EVEX_OPSIZE_ADSIZE for promoted movdir64b and just want disassembler to recognize the ADSIZE for movdir64b. But though IC_EVEX_OPSIZE_ADSIZE is just for movdir64b but the logic for ADSIZE in EVEX for disassembler could affect other instructions using ADSIZE. I may just need to expand the special handling for promoted movdir64b.
@phoebewang Thank you for pointing, will update.

https://github.com/llvm/llvm-project/pull/74713