https://bugs.llvm.org/show_bug.cgi?id=38045
Bug ID: 38045
Summary: LLVM fails to generate REX.W prefix
Product: libraries
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: bjornpa...@gmail.com
CC: llvm-bugs@lists.llvm.org
https://godbolt.org/g/fkRRsE
llc fails to compile this for all clang >= 3.5:
------------------------------------------------------------
; ModuleID = 'rexw.c'
source_filename = "rexw.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
module asm "rex.w sysexit"
!llvm.module.flags = !{!0}
!llvm.ident = !{!1}
!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{!"clang version 6.0.0 (tags/RELEASE_600/final)"}
------------------------------------------------------------
with output:
------------------------------------------------------------
<inline asm>:1:1: error: invalid instruction mnemonic 'rex.w'
rex.w sysexit
^~~~~
------------------------------------------------------------
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