2017-10-26 Wilco Dijkstra <wdijkstr@arm.com>
+ * config/aarch64/aarch64.h (EXIT_IGNORE_STACK): Set if alloca is used.
+ (aarch64_frame): Add emit_frame_chain boolean.
+ * config/aarch64/aarch64.c (aarch64_frame_pointer_required)
+ Move eh_return case to aarch64_layout_frame.
+ (aarch64_layout_frame): Initialize emit_frame_chain.
+ (aarch64_expand_prologue): Use emit_frame_chain.
+
+2017-10-26 Wilco Dijkstra <wdijkstr@arm.com>
+
* config/aarch64/aarch64.c (aarch64_layout_frame):
Ensure LR is always stored at the bottom of the callee-saves.
Remove rarely used frame layout which saves callee-saves at top of
&& !df_regs_ever_live_p (LR_REGNUM)))
return true;
- /* Force a frame pointer for EH returns so the return address is at FP+8. */
- if (crtl->calls_eh_return)
- return true;
-
return false;
}
if (reload_completed && cfun->machine->frame.laid_out)
return;
+ /* Force a frame chain for EH returns so the return address is at FP+8. */
+ cfun->machine->frame.emit_frame_chain
+ = frame_pointer_needed || crtl->calls_eh_return;
+
#define SLOT_NOT_REQUIRED (-2)
#define SLOT_REQUIRED (-1)
last_fp_reg = regno;
}
- if (frame_pointer_needed)
+ if (cfun->machine->frame.emit_frame_chain)
{
/* FP and LR are placed in the linkage record. */
cfun->machine->frame.reg_offset[R29_REGNUM] = 0;
HOST_WIDE_INT callee_offset = cfun->machine->frame.callee_offset;
unsigned reg1 = cfun->machine->frame.wb_candidate1;
unsigned reg2 = cfun->machine->frame.wb_candidate2;
+ bool emit_frame_chain = cfun->machine->frame.emit_frame_chain;
rtx_insn *insn;
/* Sign return address for functions. */
if (callee_adjust != 0)
aarch64_push_regs (reg1, reg2, callee_adjust);
- if (frame_pointer_needed)
+ if (emit_frame_chain)
{
if (callee_adjust == 0)
aarch64_save_callee_saves (DImode, callee_offset, R29_REGNUM,
insn = emit_insn (gen_add3_insn (hard_frame_pointer_rtx,
stack_pointer_rtx,
GEN_INT (callee_offset)));
- RTX_FRAME_RELATED_P (insn) = 1;
+ RTX_FRAME_RELATED_P (insn) = frame_pointer_needed;
emit_insn (gen_stack_tie (stack_pointer_rtx, hard_frame_pointer_rtx));
}
aarch64_save_callee_saves (DImode, callee_offset, R0_REGNUM, R30_REGNUM,
- callee_adjust != 0 || frame_pointer_needed);
+ callee_adjust != 0 || emit_frame_chain);
aarch64_save_callee_saves (DFmode, callee_offset, V0_REGNUM, V31_REGNUM,
- callee_adjust != 0 || frame_pointer_needed);
+ callee_adjust != 0 || emit_frame_chain);
aarch64_sub_sp (IP1_REGNUM, final_adjust, !frame_pointer_needed);
}
(epilogue_completed && (REGNO) == LR_REGNUM)
/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
- the stack pointer does not matter. The value is tested only in
- functions that have frame pointers. */
-#define EXIT_IGNORE_STACK 1
+ the stack pointer does not matter. This is only true if the function
+ uses alloca. */
+#define EXIT_IGNORE_STACK (cfun->calls_alloca)
#define STATIC_CHAIN_REGNUM R18_REGNUM
#define HARD_FRAME_POINTER_REGNUM R29_REGNUM
/* The size of the stack adjustment after saving callee-saves. */
HOST_WIDE_INT final_adjust;
+ /* Store FP,LR and setup a frame pointer. */
+ bool emit_frame_chain;
+
unsigned wb_candidate1;
unsigned wb_candidate2;