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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.
This commit is contained in:
Jan Beulich 2007-09-26 08:34:24 +00:00
parent 06dcabb057
commit 5a918ce730
5 changed files with 36 additions and 4 deletions
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11
gas/ChangeLog
View File

@ -1,3 +1,14 @@
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.
2007-09-26 Jan Beulich <jbeulich@novell.com>
* dw2gencfi.c: Conditionalize whole body upon TARGET_USE_CFIPOP.

2
gas/config/tc-i386.h
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@ -272,6 +272,8 @@ extern int tc_i386_fix_adjustable (struct fix *);
extern int i386_parse_name (char *, expressionS *, char *);
#define md_parse_name(s, e, m, c) i386_parse_name (s, e, c)
#define md_register_arithmetic 0
extern const struct relax_type md_relax_table[];
#define TC_GENERIC_RELAX_TABLE md_relax_table

1
gas/config/tc-ia64.h
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@ -130,6 +130,7 @@ extern void ia64_convert_frag (fragS *);
#endif /* TE_HPUX */
#define md_flush_pending_output() ia64_flush_pending_output ()
#define md_parse_name(s,e,m,c) ia64_parse_name (s, e, c)
#define md_register_arithmetic 0
#define tc_canonicalize_symbol_name(s) ia64_canonicalize_symbol_name (s)
#define tc_canonicalize_section_name(s) ia64_canonicalize_symbol_name (s)
#define md_optimize_expr(l,o,r) ia64_optimize_expr (l, o, r)

10
gas/doc/internals.texi
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@ -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

16
gas/expr.c
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@ -95,7 +95,9 @@ make_expr_symbol (expressionS *expressionP)
symbolP = symbol_create (FAKE_LABEL_NAME,
(expressionP->X_op == O_constant
? absolute_section
: expr_section),
: expressionP->X_op == O_register
? reg_section
: expr_section),
0, &zero_address_frag);
symbol_set_value_expression (symbolP, expressionP);
@ -1722,7 +1724,11 @@ expr (int rankarg, /* Larger # is higher rank. */
}
else
#endif
if (op_left == O_add && right.X_op == O_constant)
#ifndef md_register_arithmetic
# define md_register_arithmetic 1
#endif
if (op_left == O_add && right.X_op == O_constant
&& (md_register_arithmetic || resultP->X_op != O_register))
{
/* X + constant. */
resultP->X_add_number += right.X_add_number;
@ -1745,12 +1751,14 @@ expr (int rankarg, /* Larger # is higher rank. */
resultP->X_op = O_constant;
resultP->X_add_symbol = 0;
}
else if (op_left == O_subtract && right.X_op == O_constant)
else if (op_left == O_subtract && right.X_op == O_constant
&& (md_register_arithmetic || resultP->X_op != O_register))
{
/* X - constant. */
resultP->X_add_number -= right.X_add_number;
}
else if (op_left == O_add && resultP->X_op == O_constant)
else if (op_left == O_add && resultP->X_op == O_constant
&& (md_register_arithmetic || right.X_op != O_register))
{
/* Constant + X. */
resultP->X_op = right.X_op;