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Bug 23123 – -vasm wrong result for cmpxchg16b

Status: RESOLVED
Resolution: FIXED
Severity: normal
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: x86_64
OS: All
Creation time: 2022-05-18T00:13:34Z
Last change time: 2022-05-18T21:50:42Z
Keywords: pull
Assigned to: No Owner
Creator: mhh

Comments

Comment #0 by maxhaton — 2022-05-18T00:13:34Z

Seems to ignore the rex prefix.

Comment #1 by dlang-bot — 2022-05-18T00:21:09Z

@maxhaton created dlang/dmd pull request #14136 "Fix Issue 23123 - -vasm ignored REX prefix for cmpxchg" fixing this issue: - Fix Issue 23123 - -vasm ignored REX prefix for cmpxchg This led to a mistaken bug report because obj2asm has the same issue. The bug makes it look like dmd is emitting the wrong CAS instruction (but it actually was) https://github.com/dlang/dmd/pull/14136

Comment #2 by dlang-bot — 2022-05-18T21:50:42Z

dlang/dmd pull request #14136 "Fix Issue 23123 - -vasm ignored REX prefix for cmpxchg" was merged into master: - 1785681ed0fe34bc2bc8d3102347ec051b0971c2 by mhh: Fix Issue 23123 - -vasm ignored REX prefix for cmpxchg This led to a mistaken bug report because obj2asm has the same issue. The bug makes it look like dmd is emitting the wrong CAS instruction (but it actually was) https://github.com/dlang/dmd/pull/14136