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re PR target/7856 ([arm] invalid offset in constant pool reference)

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PR target/7856
* arm.c (use_return_insn): Don't use a return insn if there are
saved integer regs, but LR is not one of them.

From-SVN: r58716
This commit is contained in:
Richard Earnshaw 2002-11-01 14:41:57 +00:00 committed by Richard Earnshaw
parent 9dcb1ec813
commit d5db54a12c
2 changed files with 25 additions and 10 deletions
gcc
ChangeLog
config/arm
arm.c

6
gcc/ChangeLog

@ -1,3 +1,9 @@
2002-11-01 Richard Earnshaw (rearnsha@arm.com)
PR target/7856
* arm.c (use_return_insn): Don't use a return insn if there are
saved integer regs, but LR is not one of them.
Fri Nov 1 10:33:15 CET 2002 Jan Hubicka <jh@suse.cz>
* expr.c (emit_move_insn): Use SCALAR_FLOAT_MODE_P

29
gcc/config/arm/arm.c

@ -909,6 +909,7 @@ use_return_insn (iscond)
{
int regno;
unsigned int func_type;
unsigned long saved_int_regs;
/* Never use a return instruction before reload has run. */
if (!reload_completed)
@ -931,23 +932,31 @@ use_return_insn (iscond)
&& !frame_pointer_needed))
return 0;
saved_int_regs = arm_compute_save_reg_mask ();
/* Can't be done if interworking with Thumb, and any registers have been
stacked. Similarly, on StrongARM, conditional returns are expensive
if they aren't taken and registers have been stacked. */
if (iscond && arm_is_strong && frame_pointer_needed)
stacked. */
if (TARGET_INTERWORK && saved_int_regs != 0)
return 0;
if ((iscond && arm_is_strong)
|| TARGET_INTERWORK)
/* On StrongARM, conditional returns are expensive if they aren't
taken and multiple registers have been stacked. */
if (iscond && arm_is_strong)
{
for (regno = 0; regno <= LAST_ARM_REGNUM; regno++)
if (regs_ever_live[regno] && !call_used_regs[regno])
return 0;
/* Conditional return when just the LR is stored is a simple
conditional-load instruction, that's not expensive. */
if (saved_int_regs != 0 && saved_int_regs != (1 << LR_REGNUM))
return 0;
if (flag_pic && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
return 0;
}
/* If there are saved registers but the LR isn't saved, then we need
two instructions for the return. */
if (saved_int_regs && !(saved_int_regs & (1 << LR_REGNUM)))
return 0;
/* Can't be done if any of the FPU regs are pushed,
since this also requires an insn. */
if (TARGET_HARD_FLOAT)