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(print_multi_reg): Do not generate a type 2 LDM instructions with writeback enabled.

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(print_multi_reg): Do not generate a type 2 LDM instructions with writeback
enabled.
(output_return_instruction): Likewise.

From-SVN: r64306
This commit is contained in:
Nick Clifton 2003-03-13 12:03:36 +00:00 committed by Nick Clifton
parent 2ed0b52a04
commit b17fe23365
2 changed files with 35 additions and 15 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2003-03-13 Nick Clifton <nickc@redhat.com>
* config/arm/arm.c (print_multi_reg): Do not generate a type 2
LDM instructions with writeback enabled.
(output_return_instruction): Likewise.
* config/arm/pe.h (FIXED_REGISTERS): Remove definition.
(CALL_USED_REGISTERS): Remove definition.
(SUBTARGET_CONDITIONAL_REGISTER_USAGE): Define.

46
gcc/config/arm/arm.c
View File

@ -7204,7 +7204,17 @@ print_multi_reg (stream, instr, reg, mask)
not_first = TRUE;
}
fprintf (stream, "}%s\n", TARGET_APCS_32 ? "" : "^");
fprintf (stream, "}");
/* Add a ^ character for the 26-bit ABI, but only if we were loading
the PC or not updating the stack pointer. Otherwise we generate
an UNPREDICTABLE instruction. */
if (! TARGET_APCS_32
&& (((mask & (1 << PC_REGNUM)) != 0)
|| strchr (instr, '!') == NULL))
fprintf (stream, "^");
fprintf (stream, "\n");
}
/* Output a 'call' insn. */
@ -8210,20 +8220,26 @@ output_return_instruction (operand, really_return, reverse)
if (live_regs_mask & (1 << LR_REGNUM))
{
int l = strlen (return_reg);
if (! first)
{
memcpy (p, ", ", 2);
p += 2;
}
memcpy (p, "%|", 2);
memcpy (p + 2, return_reg, l);
strcpy (p + 2 + l, ((TARGET_APCS_32
&& !IS_INTERRUPT (func_type))
|| !really_return)
? "}" : "}^");
sprintf (p, "%s%%|%s}", first ? "" : ", ", return_reg);
/* Decide if we need to add the ^ symbol to the end of the
register list. This causes the saved condition codes
register to be copied into the current condition codes
register. We do the copy if we are conforming to the 32-bit
ABI and this is an interrupt function, or if we are
conforming to the 26-bit ABI. There is a special case for
the 26-bit ABI however, which is if we are writing back the
stack pointer but not loading the PC. In this case adding
the ^ symbol would create a type 2 LDM instruction, where
writeback is UNPREDICTABLE. We are safe in leaving the ^
character off in this case however, since the actual return
instruction will be a MOVS which will restore the CPSR. */
if ((TARGET_APCS_32 && IS_INTERRUPT (func_type))
|| (really_return
&& ! frame_pointer_needed
&& ((live_regs_mask & (1 << SP_REGNUM)) == 0)
&& ((live_regs_mask & (1 << PC_REGNUM)) == 0))
)
strcat (p, "^");
}
else
strcpy (p, "}");