target/2395: x86_64 opcode generated for i686

target/2395: x86_64 opcode generated for i686

[drepper]

>Number:         2395
>Category:       target
>Synopsis:       x86_64 opcode generated for i686
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 26 14:06:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     drepper@redhat.com
>Release:        gcc version 3.1 20010325 (experimental)
>Organization:
>Environment:
Linux/i686
>Description:
I've reported this before with the wrong category.  Maybe this is why nobody looked at this.

Compiling the attached file with

gcc -c -O2 ffsll.i

with today's (2001-3-26, but going back to at least 2001-3-16) gcc leads to the message

/tmp/ccdIDgSe.s:26: Error: suffix or operands invalid for `bsf'
/tmp/ccdIDgSe.s:43: Error: suffix or operands invalid for `bsf'

What happens is that the registers in the asm statements are substituted inccorectly:

bsfl %rsi,%ebx

This seems to be the syntax for the extended x86_64 registers but of course is very wrong on i686.
>How-To-Repeat:
Compile attached file with

gcc -c -O2 ffsll.i
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
 
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