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Allow illegal shifts by zero to be recorded as logical shift lefts by zero.

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This commit is contained in:
Nick Clifton
2000-08-17 23:46:43 +00:00
parent 3f215a1093
commit 4fb7971f4b
2 changed files with 17 additions and 6 deletions
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5
gas/ChangeLog
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@ -1,3 +1,8 @@
2000-08-17 Nick Clifton <nickc@redhat.com>
* config/tc-arm.c (decode_shift): Allow illegal shifts by zero
to be recoded as logical shift lefts by zero.
2000-08-16 Jim Wilson <wilson@cygnus.com> 2000-08-16 Jim Wilson <wilson@cygnus.com>
* config/tc-ia64.c (specify_resource, case IA64_RS_GR): Handle * config/tc-ia64.c (specify_resource, case IA64_RS_GR): Handle

18
gas/config/tc-arm.c
View File

@ -2531,7 +2531,7 @@ decode_shift (str, unrestrict)
char ** str; char ** str;
int unrestrict; int unrestrict;
{ {
struct asm_shift_name * shift; const struct asm_shift_name * shift;
char * p; char * p;
char c; char c;
@ -2548,7 +2548,7 @@ decode_shift (str, unrestrict)
c = * p; c = * p;
* p = '\0'; * p = '\0';
shift = (struct asm_shift_name *) hash_find (arm_shift_hsh, * str); shift = (const struct asm_shift_name *) hash_find (arm_shift_hsh, * str);
* p = c; * p = c;
if (shift == NULL) if (shift == NULL)
@ -2602,10 +2602,16 @@ decode_shift (str, unrestrict)
|| (num == 32 && shift->properties->allows_32 == 0) || (num == 32 && shift->properties->allows_32 == 0)
) )
{ {
/* As a special case we allow ROR #0, but we issue a message /* As a special case we allow a shift of zero for
reminding the programmer that this is actually an RRX. */ modes that do not support it to be recoded as an
if (num == 0 && shift->properties->index == SHIFT_ROR) logical shift left of zero (ie nothing). We warn
as_tsktsk (_("ROR #0 is actually RRX")); about this though. */
if (num == 0)
{
as_tsktsk (_("Shift of 0 ignored."));
shift = shift_names;
assert (shift->properties->index == SHIFT_LSL);
}
else else
{ {
inst.error = _("Invalid immediate shift"); inst.error = _("Invalid immediate shift");