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| author | Jan Beulich <jbeulich@novell.com> | 2007-09-26 08:34:24 +0000 |
|---|---|---|
| committer | Jan Beulich <jbeulich@novell.com> | 2007-09-26 08:34:24 +0000 |
| commit | 5a918ce730bca784591cef4b3696269510c5f814 (patch) | |
| tree | 2ce8a511b710ee981a26018c12295ae8455f00f0 /gas/doc | |
| parent | 06dcabb0579335e3db3825385d41de58e529c7c0 (diff) | |
| download | gdb-5a918ce730bca784591cef4b3696269510c5f814.zip gdb-5a918ce730bca784591cef4b3696269510c5f814.tar.gz gdb-5a918ce730bca784591cef4b3696269510c5f814.tar.bz2 | |
gas/
2007-09-26 Jan Beulich <jbeulich@novell.com>
* config/tc-i386.h (md_register_arithmetic): Define.
* config/tc-ia64.h (md_register_arithmetic): Likewise.
* doc/internals.texi: Document md_register_arithmetic.
* expr.c (make_expr_symbol): Force O_register expressions into
reg_section.
(expr): Provide default for md_register_arithmetic. Don't resolve
adding/subtracting constants to/from registers if
md_register_arithmetic is zero.
Diffstat (limited to 'gas/doc')
| -rw-r--r-- | gas/doc/internals.texi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gas/doc/internals.texi b/gas/doc/internals.texi index c63a2db..a97ead3 100644 --- a/gas/doc/internals.texi +++ b/gas/doc/internals.texi @@ -1045,6 +1045,16 @@ pointer, for any expression that can not be recognized. When the function is called, @code{input_line_pointer} will point to the start of the expression. +@item md_register_arithmetic +@cindex md_register_arithmetic +If this macro is defined and evaluates to zero then GAS will not fold +expressions that add or subtract a constant to/from a register to give +another register. For example GAS's default behaviour is to fold the +expression "r8 + 1" into "r9", which is probably not the result +intended by the programmer. The default is to allow such folding, +since this maintains backwards compatibility with earlier releases of +GAS. + @item tc_unrecognized_line @cindex tc_unrecognized_line If you define this macro, GAS will call it when it finds a line that it can not |