rs6000.c (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP): Define.
* config/rs6000/rs6000.c (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP): Define. (rs6000_emit_epilogue): Use backchain to restore only when we have a large frame. Make use of frame pointer to restore if we have one. Handle ALWAYS_RESTORE_ALTIVEC_BEFORE_POP. From-SVN: r134816
This commit is contained in:
Alan Modra
Alan Modra
parent
d4f90ccc7c
commit
1c9c5e4382
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@ -1,3 +1,10 @@
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2008-04-30 Alan Modra <amodra@bigpond.net.au>
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* config/rs6000/rs6000.c (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP): Define.
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(rs6000_emit_epilogue): Use backchain to restore only when we
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have a large frame. Make use of frame pointer to restore if we
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have one. Handle ALWAYS_RESTORE_ALTIVEC_BEFORE_POP.
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2008-04-29 Paolo Bonzini <bonzini@gnu.org>
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* config/avr/avr.md (*sbrx_branch, *sbix_branch, *sbix_branch_tmp):
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@ -1,6 +1,6 @@
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/* Subroutines used for code generation on IBM RS/6000.
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Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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Free Software Foundation, Inc.
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Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
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@ -16244,6 +16244,10 @@ rs6000_output_function_prologue (FILE *file,
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rs6000_pic_labelno++;
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}
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/* Non-zero if vmx regs are restored before the frame pop, zero if
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we restore after the pop when possible. */
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#define ALWAYS_RESTORE_ALTIVEC_BEFORE_POP 0
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/* Emit function epilogue as insns.
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At present, dwarf2out_frame_debug_expr doesn't understand
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@ -16283,13 +16287,18 @@ rs6000_emit_epilogue (int sibcall)
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|| crtl->calls_eh_return
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|| info->first_fp_reg_save == 64
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|| FP_SAVE_INLINE (info->first_fp_reg_save));
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use_backchain_to_restore_sp = (frame_pointer_needed
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|| cfun->calls_alloca
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|| info->total_size > 32767);
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using_mtcr_multiple = (rs6000_cpu == PROCESSOR_PPC601
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|| rs6000_cpu == PROCESSOR_PPC603
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|| rs6000_cpu == PROCESSOR_PPC750
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|| optimize_size);
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/* Restore via the backchain when we have a large frame, since this
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is more efficient than an addis, addi pair. The second condition
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here will not trigger at the moment; We don't actually need a
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frame pointer for alloca, but the generic parts of the compiler
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give us one anyway. */
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use_backchain_to_restore_sp = (info->total_size > 32767
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|| (cfun->calls_alloca
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&& !frame_pointer_needed));
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if (WORLD_SAVE_P (info))
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{
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@ -16390,8 +16399,9 @@ rs6000_emit_epilogue (int sibcall)
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stack. */
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if (TARGET_ALTIVEC_ABI
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&& info->altivec_size != 0
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&& DEFAULT_ABI != ABI_V4
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&& info->altivec_save_offset < (TARGET_32BIT ? -220 : -288))
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&& (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
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|| (DEFAULT_ABI != ABI_V4
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&& info->altivec_save_offset < (TARGET_32BIT ? -220 : -288))))
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{
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int i;
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@ -16402,6 +16412,8 @@ rs6000_emit_epilogue (int sibcall)
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gen_rtx_MEM (Pmode, sp_reg_rtx));
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sp_offset = 0;
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}
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else if (frame_pointer_needed)
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frame_reg_rtx = hard_frame_pointer_rtx;
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for (i = info->first_altivec_reg_save; i <= LAST_ALTIVEC_REGNO; ++i)
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if (info->vrsave_mask & ALTIVEC_REG_BIT (i))
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@ -16426,18 +16438,23 @@ rs6000_emit_epilogue (int sibcall)
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if (TARGET_ALTIVEC
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&& TARGET_ALTIVEC_VRSAVE
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&& info->vrsave_mask != 0
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&& DEFAULT_ABI != ABI_V4
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&& info->vrsave_save_offset < (TARGET_32BIT ? -220 : -288))
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&& (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
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|| (DEFAULT_ABI != ABI_V4
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&& info->vrsave_save_offset < (TARGET_32BIT ? -220 : -288))))
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{
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rtx addr, mem, reg;
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if (use_backchain_to_restore_sp
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&& frame_reg_rtx == sp_reg_rtx)
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if (frame_reg_rtx == sp_reg_rtx)
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{
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frame_reg_rtx = gen_rtx_REG (Pmode, 11);
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emit_move_insn (frame_reg_rtx,
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gen_rtx_MEM (Pmode, sp_reg_rtx));
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sp_offset = 0;
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if (use_backchain_to_restore_sp)
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{
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frame_reg_rtx = gen_rtx_REG (Pmode, 11);
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emit_move_insn (frame_reg_rtx,
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gen_rtx_MEM (Pmode, sp_reg_rtx));
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sp_offset = 0;
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}
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else if (frame_pointer_needed)
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frame_reg_rtx = hard_frame_pointer_rtx;
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}
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addr = gen_rtx_PLUS (Pmode, frame_reg_rtx,
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@ -16449,17 +16466,11 @@ rs6000_emit_epilogue (int sibcall)
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emit_insn (generate_set_vrsave (reg, info, 1));
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}
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/* If we have a frame pointer, a call to alloca, or a large stack
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frame, restore the old stack pointer using the backchain. Otherwise,
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we know what size to update it with. */
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/* If we have a large stack frame, restore the old stack pointer
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using the backchain. */
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if (use_backchain_to_restore_sp)
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{
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if (frame_reg_rtx != sp_reg_rtx)
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{
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emit_move_insn (sp_reg_rtx, frame_reg_rtx);
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frame_reg_rtx = sp_reg_rtx;
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}
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else
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if (frame_reg_rtx == sp_reg_rtx)
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{
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/* Under V.4, don't reset the stack pointer until after we're done
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loading the saved registers. */
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@ -16470,6 +16481,30 @@ rs6000_emit_epilogue (int sibcall)
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gen_rtx_MEM (Pmode, sp_reg_rtx));
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sp_offset = 0;
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}
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else if (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
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&& DEFAULT_ABI == ABI_V4)
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/* frame_reg_rtx has been set up by the altivec restore. */
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;
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else
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{
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emit_move_insn (sp_reg_rtx, frame_reg_rtx);
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frame_reg_rtx = sp_reg_rtx;
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}
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}
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/* If we have a frame pointer, we can restore the old stack pointer
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from it. */
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else if (frame_pointer_needed)
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{
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frame_reg_rtx = sp_reg_rtx;
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if (DEFAULT_ABI == ABI_V4)
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frame_reg_rtx = gen_rtx_REG (Pmode, 11);
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emit_insn (TARGET_32BIT
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? gen_addsi3 (frame_reg_rtx, hard_frame_pointer_rtx,
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GEN_INT (info->total_size))
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: gen_adddi3 (frame_reg_rtx, hard_frame_pointer_rtx,
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GEN_INT (info->total_size)));
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sp_offset = 0;
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}
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else if (info->push_p
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&& DEFAULT_ABI != ABI_V4
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@ -16484,7 +16519,8 @@ rs6000_emit_epilogue (int sibcall)
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}
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/* Restore AltiVec registers if we have not done so already. */
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if (TARGET_ALTIVEC_ABI
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if (!ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
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&& TARGET_ALTIVEC_ABI
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&& info->altivec_size != 0
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&& (DEFAULT_ABI == ABI_V4
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|| info->altivec_save_offset >= (TARGET_32BIT ? -220 : -288)))
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@ -16511,7 +16547,8 @@ rs6000_emit_epilogue (int sibcall)
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}
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/* Restore VRSAVE if we have not done so already. */
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if (TARGET_ALTIVEC
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if (!ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
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&& TARGET_ALTIVEC
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&& TARGET_ALTIVEC_VRSAVE
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&& info->vrsave_mask != 0
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&& (DEFAULT_ABI == ABI_V4
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