[inline asm] Wrongcode for mov

[dlangBugzillaToGithub]

Stefan Koch reported this on 2018-05-04T14:15:06Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=18826

CC List

• ag0aep6g
• basile-z
• Walter Bright (@WalterBright)

Description

the following code does get mis-compiled. 
ulong getThreadID()
{
    asm { naked; mov RAX, qword ptr FS:0x0 }
}

[dlangBugzillaToGithub]

uplink.coder commented on 2018-05-04T15:21:33Z

More Info: 
DMD currently generates 64 48 8b 05 00 00 00 00 00 mov    rax,QWORD PTR fs:[rip+0x0]

But it should generate  64 48 8b 04 25 00 00 00 00 mov    rax,QWORD PTR fs:0x0