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libgcj43
nvl425798-1.patch
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File nvl425798-1.patch of Package libgcj43
2008-04-30 Alan Modra <amodra@bigpond.net.au> * 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. Index: gcc/config/rs6000/rs6000.c =================================================================== --- gcc/config/rs6000/rs6000.c.orig 2009-11-20 13:51:55.000000000 +0100 +++ gcc/config/rs6000/rs6000.c 2009-11-20 13:51:57.000000000 +0100 @@ -1,6 +1,6 @@ /* Subroutines used for code generation on IBM RS/6000. Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 + 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu) @@ -16281,6 +16281,10 @@ rs6000_output_function_prologue (FILE *f rs6000_pic_labelno++; } +/* Non-zero if vmx regs are restored before the frame pop, zero if + we restore after the pop when possible. */ +#define ALWAYS_RESTORE_ALTIVEC_BEFORE_POP 0 + /* Emit function epilogue as insns. At present, dwarf2out_frame_debug_expr doesn't understand @@ -16320,9 +16324,14 @@ rs6000_emit_epilogue (int sibcall) || current_function_calls_eh_return || info->first_fp_reg_save == 64 || FP_SAVE_INLINE (info->first_fp_reg_save)); - use_backchain_to_restore_sp = (frame_pointer_needed - || current_function_calls_alloca - || info->total_size > 32767); + /* Restore via the backchain when we have a large frame, since this + is more efficient than an addis, addi pair. The second condition + here will not trigger at the moment; We don't actually need a + frame pointer for alloca, but the generic parts of the compiler + give us one anyway. */ + use_backchain_to_restore_sp = (info->total_size > 32767 + || (cfun->calls_alloca + && !frame_pointer_needed)); using_mtcr_multiple = (rs6000_cpu == PROCESSOR_PPC601 || rs6000_cpu == PROCESSOR_PPC603 || rs6000_cpu == PROCESSOR_PPC750 @@ -16427,8 +16436,9 @@ rs6000_emit_epilogue (int sibcall) stack. */ if (TARGET_ALTIVEC_ABI && info->altivec_size != 0 - && DEFAULT_ABI != ABI_V4 - && info->altivec_save_offset < (TARGET_32BIT ? -220 : -288)) + && (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP + || (DEFAULT_ABI != ABI_V4 + && info->altivec_save_offset < (TARGET_32BIT ? -220 : -288)))) { int i; @@ -16439,6 +16449,8 @@ rs6000_emit_epilogue (int sibcall) gen_rtx_MEM (Pmode, sp_reg_rtx)); sp_offset = 0; } + else if (frame_pointer_needed) + frame_reg_rtx = hard_frame_pointer_rtx; for (i = info->first_altivec_reg_save; i <= LAST_ALTIVEC_REGNO; ++i) if (info->vrsave_mask & ALTIVEC_REG_BIT (i)) @@ -16463,18 +16475,23 @@ rs6000_emit_epilogue (int sibcall) if (TARGET_ALTIVEC && TARGET_ALTIVEC_VRSAVE && info->vrsave_mask != 0 - && DEFAULT_ABI != ABI_V4 - && info->vrsave_save_offset < (TARGET_32BIT ? -220 : -288)) + && (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP + || (DEFAULT_ABI != ABI_V4 + && info->vrsave_save_offset < (TARGET_32BIT ? -220 : -288)))) { rtx addr, mem, reg; - if (use_backchain_to_restore_sp - && frame_reg_rtx == sp_reg_rtx) + if (frame_reg_rtx == sp_reg_rtx) { - frame_reg_rtx = gen_rtx_REG (Pmode, 11); - emit_move_insn (frame_reg_rtx, - gen_rtx_MEM (Pmode, sp_reg_rtx)); - sp_offset = 0; + if (use_backchain_to_restore_sp) + { + frame_reg_rtx = gen_rtx_REG (Pmode, 11); + emit_move_insn (frame_reg_rtx, + gen_rtx_MEM (Pmode, sp_reg_rtx)); + sp_offset = 0; + } + else if (frame_pointer_needed) + frame_reg_rtx = hard_frame_pointer_rtx; } addr = gen_rtx_PLUS (Pmode, frame_reg_rtx, @@ -16486,17 +16503,11 @@ rs6000_emit_epilogue (int sibcall) emit_insn (generate_set_vrsave (reg, info, 1)); } - /* If we have a frame pointer, a call to alloca, or a large stack - frame, restore the old stack pointer using the backchain. Otherwise, - we know what size to update it with. */ + /* If we have a large stack frame, restore the old stack pointer + using the backchain. */ if (use_backchain_to_restore_sp) { - if (frame_reg_rtx != sp_reg_rtx) - { - emit_move_insn (sp_reg_rtx, frame_reg_rtx); - frame_reg_rtx = sp_reg_rtx; - } - else + if (frame_reg_rtx == sp_reg_rtx) { /* Under V.4, don't reset the stack pointer until after we're done loading the saved registers. */ @@ -16507,6 +16518,30 @@ rs6000_emit_epilogue (int sibcall) gen_rtx_MEM (Pmode, sp_reg_rtx)); sp_offset = 0; } + else if (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP + && DEFAULT_ABI == ABI_V4) + /* frame_reg_rtx has been set up by the altivec restore. */ + ; + else + { + emit_move_insn (sp_reg_rtx, frame_reg_rtx); + frame_reg_rtx = sp_reg_rtx; + } + } + /* If we have a frame pointer, we can restore the old stack pointer + from it. */ + else if (frame_pointer_needed) + { + frame_reg_rtx = sp_reg_rtx; + if (DEFAULT_ABI == ABI_V4) + frame_reg_rtx = gen_rtx_REG (Pmode, 11); + + emit_insn (TARGET_32BIT + ? gen_addsi3 (frame_reg_rtx, hard_frame_pointer_rtx, + GEN_INT (info->total_size)) + : gen_adddi3 (frame_reg_rtx, hard_frame_pointer_rtx, + GEN_INT (info->total_size))); + sp_offset = 0; } else if (info->push_p && DEFAULT_ABI != ABI_V4 @@ -16521,7 +16556,8 @@ rs6000_emit_epilogue (int sibcall) } /* Restore AltiVec registers if we have not done so already. */ - if (TARGET_ALTIVEC_ABI + if (!ALWAYS_RESTORE_ALTIVEC_BEFORE_POP + && TARGET_ALTIVEC_ABI && info->altivec_size != 0 && (DEFAULT_ABI == ABI_V4 || info->altivec_save_offset >= (TARGET_32BIT ? -220 : -288))) @@ -16548,7 +16584,8 @@ rs6000_emit_epilogue (int sibcall) } /* Restore VRSAVE if we have not done so already. */ - if (TARGET_ALTIVEC + if (!ALWAYS_RESTORE_ALTIVEC_BEFORE_POP + && TARGET_ALTIVEC && TARGET_ALTIVEC_VRSAVE && info->vrsave_mask != 0 && (DEFAULT_ABI == ABI_V4
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