diff options
Diffstat (limited to 'gcc/config/nvptx/nvptx.c')
| -rw-r--r-- | gcc/config/nvptx/nvptx.c | 46 |
1 files changed, 34 insertions, 12 deletions
diff --git a/gcc/config/nvptx/nvptx.c b/gcc/config/nvptx/nvptx.c index 43f197f17a1..3d6315a76b0 100644 --- a/gcc/config/nvptx/nvptx.c +++ b/gcc/config/nvptx/nvptx.c @@ -1,3 +1,4 @@ + /* Target code for NVPTX. Copyright (C) 2014-2015 Free Software Foundation, Inc. Contributed by Bernd Schmidt <bernds@codesourcery.com> @@ -1877,20 +1878,11 @@ get_replacement (struct reg_replace *r) conversion copyin/copyout instructions. */ static void -nvptx_reorg (void) +nvptx_reorg_subreg (void) { struct reg_replace qiregs, hiregs, siregs, diregs; rtx_insn *insn, *next; - /* We are freeing block_for_insn in the toplev to keep compatibility - with old MDEP_REORGS that are not CFG based. Recompute it now. */ - compute_bb_for_insn (); - - df_clear_flags (DF_LR_RUN_DCE); - df_analyze (); - - thread_prologue_and_epilogue_insns (); - qiregs.n_allocated = 0; hiregs.n_allocated = 0; siregs.n_allocated = 0; @@ -1966,14 +1958,44 @@ nvptx_reorg (void) validate_change (insn, recog_data.operand_loc[i], new_reg, false); } } +} - int maxregs = max_reg_num (); +/* PTX-specific reorganization + 1) mark now-unused registers, so function begin doesn't declare + unused registers. + 2) replace subregs with suitable sequences. +*/ + +static void +nvptx_reorg (void) +{ + struct reg_replace qiregs, hiregs, siregs, diregs; + rtx_insn *insn, *next; + + /* We are freeing block_for_insn in the toplev to keep compatibility + with old MDEP_REORGS that are not CFG based. Recompute it now. */ + compute_bb_for_insn (); + + thread_prologue_and_epilogue_insns (); + + df_clear_flags (DF_LR_RUN_DCE); + df_set_flags (DF_NO_INSN_RESCAN | DF_NO_HARD_REGS); + df_analyze (); regstat_init_n_sets_and_refs (); - for (int i = LAST_VIRTUAL_REGISTER + 1; i < maxregs; i++) + int max_regs = max_reg_num (); + + /* Mark unused regs as unused. */ + for (int i = LAST_VIRTUAL_REGISTER + 1; i < max_regs; i++) if (REG_N_SETS (i) == 0 && REG_N_REFS (i) == 0) regno_reg_rtx[i] = const0_rtx; + + /* Replace subregs. */ + nvptx_reorg_subreg (max_regs); + regstat_free_n_sets_and_refs (); + + df_finish_pass (true); } /* Handle a "kernel" attribute; arguments as in |