[binutils-gdb] s390: Document syntax to omit base register operand

[Jens Remus]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e75cfa9f0f81f70389b6d81d22b664c37f2403db

commit e75cfa9f0f81f70389b6d81d22b664c37f2403db
Author: Jens Remus <jremus@linux.ibm.com>
Date:   Mon Sep 9 17:05:27 2024 +0200

    s390: Document syntax to omit base register operand
    
    Document the s390-specific assembler syntax introduced by commit
    aacf780bca29 ("s390: Allow to explicitly omit base register operand in
    assembly") to omit the base register operand B in D(X,B) and D(L,B) by
    coding D(X,) and D(L,).
    
    While at it document the alternative syntax to omit the index register
    operand X in D(X,B) by coding D(,B) instead of D(B).
    
    gas/
            * doc/c-s390.texi (s390 Operands): Document syntax to omit base
            register operand.
    
    Fixes: aacf780bca29 ("s390: Allow to explicitly omit base register operand in assembly")
    Signed-off-by: Jens Remus <jremus@linux.ibm.com>

Diff:
---
 gas/doc/c-s390.texi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gas/doc/c-s390.texi b/gas/doc/c-s390.texi
index f73dfdeae60..cd0dc7be258 100644
--- a/gas/doc/c-s390.texi
+++ b/gas/doc/c-s390.texi
@@ -300,10 +300,11 @@ field. The notation changes as follows:
 @display
 @multitable @columnfractions 0.30 0.30
 @headitem full notation @tab short notation
-@item Dn(0,Bn) @tab Dn(Bn)
+@item Dn(Xn,0) @tab Dn(Xn,)
+@item Dn(0,Bn) @tab Dn(,Bn) or Dn(Bn)
 @item Dn(0,0) @tab Dn
 @item Dn(0) @tab Dn
-@item Dn(Ln,0) @tab Dn(Ln)
+@item Dn(Ln,0) @tab Dn(Ln,) or Dn(Ln)
 @end multitable
 @end display