mirror of git://gcc.gnu.org/git/gcc.git
re PR rtl-optimization/50063 (DSE: wrong code for gcc.dg/torture/pta-ptrarith-3.c)
PR rtl-optimization/50063 * config/avr/avr.md (movhi_sp_r): Handle -1 (unknown IRQ state) and 2 (8-bit SP) in operand 2. * config/avr/avr.c (avr_prologue_setup_frame): Adjust prologue setup to use movhi_sp_r instead of vanilla move to write SP. Adjust REG_CFA notes to superseed unspec. (expand_epilogue): Adjust epilogue setup to use movhi_sp_r instead of vanilla move. As function body might contain CLI or SEI: Use irq_state 0 (IRQ known to be off) only with TARGET_NO_INTERRUPTS. Never use irq_state 1 (IRQ known to be on) here. From-SVN: r184461
This commit is contained in:
Georg-Johann Lay
Georg-Johann Lay
parent
8d071654dc
commit
0b262c28c6
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@ -1,3 +1,17 @@
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2012-02-22 Georg-Johann Lay <avr@gjlay.de>
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PR rtl-optimization/50063
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* config/avr/avr.md (movhi_sp_r): Handle -1 (unknown IRQ state)
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and 2 (8-bit SP) in operand 2.
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* config/avr/avr.c (avr_prologue_setup_frame): Adjust prologue
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setup to use movhi_sp_r instead of vanilla move to write SP.
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Adjust REG_CFA notes to superseed unspec.
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(expand_epilogue): Adjust epilogue setup to use movhi_sp_r instead
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of vanilla move.
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As function body might contain CLI or SEI: Use irq_state 0 (IRQ
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known to be off) only with TARGET_NO_INTERRUPTS. Never use
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irq_state 1 (IRQ known to be on) here.
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2012-02-21 Bernd Schmidt <bernds@codesourcery.com>
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* ira.c (check_allocation): Use REG_WORDS_BIG_ENDIAN, not
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@ -1062,8 +1062,8 @@ avr_prologue_setup_frame (HOST_WIDE_INT size, HARD_REG_SET set)
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!frame_pointer_needed can only occur if the function is not a
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leaf function and thus X has already been saved. */
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int irq_state = -1;
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rtx fp_plus_insns, fp, my_fp;
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rtx sp_minus_size = plus_constant (stack_pointer_rtx, -size);
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gcc_assert (frame_pointer_needed
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|| !isr_p
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@ -1076,7 +1076,7 @@ avr_prologue_setup_frame (HOST_WIDE_INT size, HARD_REG_SET set)
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if (AVR_HAVE_8BIT_SP)
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{
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/* The high byte (r29) does not change:
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Prefer SUBI (1 cycle) over ABIW (2 cycles, same size). */
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Prefer SUBI (1 cycle) over SBIW (2 cycles, same size). */
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my_fp = all_regs_rtx[FRAME_POINTER_REGNUM];
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}
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@ -1092,43 +1092,50 @@ avr_prologue_setup_frame (HOST_WIDE_INT size, HARD_REG_SET set)
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the frame pointer subtraction is done. */
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insn = emit_move_insn (fp, stack_pointer_rtx);
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if (!frame_pointer_needed)
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RTX_FRAME_RELATED_P (insn) = 1;
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insn = emit_move_insn (my_fp, plus_constant (my_fp, -size));
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RTX_FRAME_RELATED_P (insn) = 1;
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if (frame_pointer_needed)
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{
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RTX_FRAME_RELATED_P (insn) = 1;
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add_reg_note (insn, REG_CFA_ADJUST_CFA,
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gen_rtx_SET (VOIDmode, fp, sp_minus_size));
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gen_rtx_SET (VOIDmode, fp, stack_pointer_rtx));
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}
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insn = emit_move_insn (my_fp, plus_constant (my_fp, -size));
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if (frame_pointer_needed)
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{
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RTX_FRAME_RELATED_P (insn) = 1;
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add_reg_note (insn, REG_CFA_ADJUST_CFA,
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gen_rtx_SET (VOIDmode, fp,
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plus_constant (fp, -size)));
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}
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/* Copy to stack pointer. Note that since we've already
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changed the CFA to the frame pointer this operation
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need not be annotated if frame pointer is needed. */
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if (AVR_HAVE_8BIT_SP || AVR_XMEGA)
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{
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insn = emit_move_insn (stack_pointer_rtx, fp);
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}
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else if (TARGET_NO_INTERRUPTS
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|| isr_p
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|| cfun->machine->is_OS_main)
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{
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rtx irqs_are_on = GEN_INT (!!cfun->machine->is_interrupt);
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insn = emit_insn (gen_movhi_sp_r (stack_pointer_rtx,
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fp, irqs_are_on));
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}
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else
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{
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insn = emit_move_insn (stack_pointer_rtx, fp);
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}
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need not be annotated if frame pointer is needed.
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Always move through unspec, see PR50063.
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For meaning of irq_state see movhi_sp_r insn. */
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if (cfun->machine->is_interrupt)
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irq_state = 1;
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if (TARGET_NO_INTERRUPTS
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|| cfun->machine->is_signal
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|| cfun->machine->is_OS_main)
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irq_state = 0;
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if (AVR_HAVE_8BIT_SP)
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irq_state = 2;
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insn = emit_insn (gen_movhi_sp_r (stack_pointer_rtx,
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fp, GEN_INT (irq_state)));
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if (!frame_pointer_needed)
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RTX_FRAME_RELATED_P (insn) = 1;
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{
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RTX_FRAME_RELATED_P (insn) = 1;
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add_reg_note (insn, REG_CFA_ADJUST_CFA,
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gen_rtx_SET (VOIDmode, stack_pointer_rtx,
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plus_constant (stack_pointer_rtx,
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-size)));
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}
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fp_plus_insns = get_insns ();
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end_sequence ();
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@ -1143,9 +1150,13 @@ avr_prologue_setup_frame (HOST_WIDE_INT size, HARD_REG_SET set)
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start_sequence ();
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insn = emit_move_insn (stack_pointer_rtx, sp_minus_size);
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insn = emit_move_insn (stack_pointer_rtx,
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plus_constant (stack_pointer_rtx, -size));
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RTX_FRAME_RELATED_P (insn) = 1;
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add_reg_note (insn, REG_CFA_ADJUST_CFA,
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gen_rtx_SET (VOIDmode, stack_pointer_rtx,
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plus_constant (stack_pointer_rtx,
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-size)));
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if (frame_pointer_needed)
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{
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insn = emit_move_insn (fp, stack_pointer_rtx);
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@ -1376,7 +1387,8 @@ expand_epilogue (bool sibcall_p)
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if (size)
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{
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/* Try two methods to adjust stack and select shortest. */
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int irq_state = -1;
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rtx fp, my_fp;
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rtx fp_plus_insns;
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@ -1406,23 +1418,15 @@ expand_epilogue (bool sibcall_p)
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emit_move_insn (my_fp, plus_constant (my_fp, size));
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/* Copy to stack pointer. */
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if (AVR_HAVE_8BIT_SP || AVR_XMEGA)
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{
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emit_move_insn (stack_pointer_rtx, fp);
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}
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else if (TARGET_NO_INTERRUPTS
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|| isr_p
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|| cfun->machine->is_OS_main)
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{
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rtx irqs_are_on = GEN_INT (!!cfun->machine->is_interrupt);
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emit_insn (gen_movhi_sp_r (stack_pointer_rtx, fp, irqs_are_on));
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}
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else
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{
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emit_move_insn (stack_pointer_rtx, fp);
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}
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if (TARGET_NO_INTERRUPTS)
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irq_state = 0;
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if (AVR_HAVE_8BIT_SP)
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irq_state = 2;
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emit_insn (gen_movhi_sp_r (stack_pointer_rtx, fp,
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GEN_INT (irq_state)));
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fp_plus_insns = get_insns ();
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end_sequence ();
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@ -583,23 +583,26 @@
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;; Move register $1 to the Stack Pointer register SP.
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;; This insn is emit during function prologue/epilogue generation.
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;; $2 = 0: We know that IRQs are off
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;; $2 = 1: We know that IRQs are on
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;; Remaining cases when the state of the I-Flag is unknown are
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;; handled by generic movhi insn.
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;; $2 = 0: We know that IRQs are off
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;; $2 = 1: We know that IRQs are on
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;; $2 = 2: SP has 8 bits only, IRQ state does not matter
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;; $2 = -1: We don't know anything about IRQ on/off
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;; Always write SP via unspec, see PR50063
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(define_insn "movhi_sp_r"
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[(set (match_operand:HI 0 "stack_register_operand" "=q,q,q")
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(unspec_volatile:HI [(match_operand:HI 1 "register_operand" "r,r,r")
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(match_operand:HI 2 "const_int_operand" "L,P,LP")]
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[(set (match_operand:HI 0 "stack_register_operand" "=q,q,q,q,q")
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(unspec_volatile:HI [(match_operand:HI 1 "register_operand" "r,r,r,r,r")
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(match_operand:HI 2 "const_int_operand" "L,P,N,K,LPN")]
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UNSPECV_WRITE_SP))]
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"!AVR_HAVE_8BIT_SP"
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""
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"@
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out __SP_H__,%B1\;out __SP_L__,%A1
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cli\;out __SP_H__,%B1\;sei\;out __SP_L__,%A1
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out __SP_L__,%A1\;out __SP_H__,%B1"
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[(set_attr "length" "2,4,2")
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(set_attr "isa" "no_xmega,no_xmega,xmega")
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out %B0,%B1\;out %A0,%A1
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cli\;out %B0,%B1\;sei\;out %A0,%A1
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in __tmp_reg__,__SREG__\;cli\;out %B0,%B1\;out __SREG__,__tmp_reg__\;out %A0,%A1
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out %A0,%A1
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out %A0,%A1\;out %B0,%B1"
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[(set_attr "length" "2,4,5,1,2")
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(set_attr "isa" "no_xmega,no_xmega,no_xmega,*,xmega")
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(set_attr "cc" "none")])
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(define_peephole2
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