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arm: Add support for interrupt routines to reg_needs_saving_p

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reg_needs_saving_p is only used when dealing with non-interrupt
routines, but it makes sense to extend it to support that context too,
and make arm_compute_save_reg0_reg12_mask use it.

Save only live registers for non-leaf functions, but assume a callee
could clobber any register.

2020-05-15  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* config/arm/arm.c (reg_needs_saving_p): Add support for interrupt
	routines.
	(arm_compute_save_reg0_reg12_mask): Use reg_needs_saving_p.
This commit is contained in:
Christophe Lyon 2020-05-04 13:42:03 +00:00
parent 9f0f7da9aa
commit 62af27e77b
2 changed files with 27 additions and 7 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2020-05-15 Christophe Lyon <christophe.lyon@linaro.org>
* config/arm/arm.c (reg_needs_saving_p): Add support for interrupt
routines.
(arm_compute_save_reg0_reg12_mask): Use reg_needs_saving_p.
2020-05-15 Tobias Burnus <tobias@codesourcery.com>
PR middle-end/94635

28
gcc/config/arm/arm.c
View File

@ -4188,14 +4188,29 @@ arm_trampoline_adjust_address (rtx addr)
return addr;
}
/* Return 1 if REG needs to be saved. */
/* Return 1 if REG needs to be saved. For interrupt handlers, this
includes call-clobbered registers too. If this is a leaf function
we can just examine the registers used by the RTL, but otherwise we
have to assume that whatever function is called might clobber
anything, and so we have to save all the call-clobbered registers
as well. */
static inline bool reg_needs_saving_p (unsigned reg)
{
if (!df_regs_ever_live_p (reg)
|| call_used_or_fixed_reg_p (reg))
return false;
unsigned long func_type = arm_current_func_type ();
if (IS_INTERRUPT (func_type))
if (df_regs_ever_live_p (reg)
/* Save call-clobbered core registers. */
|| (! crtl->is_leaf && call_used_or_fixed_reg_p (reg) && reg < FIRST_VFP_REGNUM))
return true;
else
return false;
else
return true;
if (!df_regs_ever_live_p (reg)
|| call_used_or_fixed_reg_p (reg))
return false;
else
return true;
}
/* Return 1 if it is possible to return using a single instruction.
@ -20677,8 +20692,7 @@ arm_compute_save_reg0_reg12_mask (void)
max_reg = 12;
for (reg = 0; reg <= max_reg; reg++)
if (df_regs_ever_live_p (reg)
|| (! crtl->is_leaf && call_used_or_fixed_reg_p (reg)))
if (reg_needs_saving_p (reg))
save_reg_mask |= (1 << reg);
/* Also save the pic base register if necessary. */