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arc: Update stack size computation when accumulator registers are available. 

When accumulator registers are available in a processor, they need to
be save onto stack durring interrupts.  We were already doing so, but
the stack size was wrongly computed in the case other than ARC600.

gcc/

	* config/arc/arc.c (arc_compute_frame_size): Remove condition when
	computin checking accumulator regs.
	(arc_expand_prologue): Update comments.
	(arc_expand_epilogue): Likewise.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
This commit is contained in:
Claudiu Zissulescu 2021-11-25 15:38:03 +02:00
parent 9a0b518a82
commit b3989a7b10
1 changed files with 4 additions and 5 deletions
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9
gcc/config/arc/arc.c
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@ -2897,9 +2897,8 @@ arc_compute_frame_size (void)
cfun, TARGET_DPFP)) cfun, TARGET_DPFP))
reg_size += UNITS_PER_WORD * 2; reg_size += UNITS_PER_WORD * 2;
/* Check for special MLO/MHI case used by ARC600' MUL64 /* Check if R58 is used. */
extension. */ if (arc_must_save_register (R58_REG, cfun, true))
if (arc_must_save_register (R58_REG, cfun, TARGET_MUL64_SET))
reg_size += UNITS_PER_WORD * 2; reg_size += UNITS_PER_WORD * 2;
/* 4) Calculate extra size made up of the blink + fp size. */ /* 4) Calculate extra size made up of the blink + fp size. */
@ -3878,7 +3877,7 @@ arc_expand_prologue (void)
} }
} }
/* Save ARC600' MUL64 registers. */ /* Save accumulator registers. */
if (arc_must_save_register (R58_REG, cfun, true)) if (arc_must_save_register (R58_REG, cfun, true))
frame_size_to_allocate -= arc_save_callee_saves (3ULL << 58, frame_size_to_allocate -= arc_save_callee_saves (3ULL << 58,
false, false, 0, false); false, false, 0, false);
@ -3971,7 +3970,7 @@ arc_expand_epilogue (int sibcall_p)
first_offset = 0; first_offset = 0;
} }
/* Restore ARC600' MUL64 registers. */ /* Restore accumulator registers. */
if (arc_must_save_register (R58_REG, cfun, true)) if (arc_must_save_register (R58_REG, cfun, true))
{ {
rtx insn; rtx insn;