104 lines
3.6 KiB
Diff
104 lines
3.6 KiB
Diff
From ac51d446ee605e942b0831d3ff617980d94bf502 Mon Sep 17 00:00:00 2001
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From: Richard Sandiford <richard.sandiford@arm.com>
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Date: Sat, 11 Nov 2023 17:28:56 +0000
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Subject: [PATCH 037/157] [Backport][SME] mode-switching: Simplify recording of
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transparency
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Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=335b55f4146c5ef9e3bf4bcb7e58e887c3150b02
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For a given block, an entity is either transparent for
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all modes or for none. Each update to the transparency set
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therefore used a loop like:
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for (i = 0; i < no_mode; i++)
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clear_mode_bit (transp[bb->index], j, i);
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This patch instead starts out with a bit-per-block bitmap
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and updates the main bitmap at the end.
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This isn't much of a simplification on its own. The main
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purpose is to simplify later patches.
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gcc/
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* mode-switching.cc (optimize_mode_switching): Initially
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compute transparency in a bit-per-block bitmap.
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---
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gcc/mode-switching.cc | 19 +++++++++++--------
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1 file changed, 11 insertions(+), 8 deletions(-)
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diff --git a/gcc/mode-switching.cc b/gcc/mode-switching.cc
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index 584cd4f67..4d2b9e284 100644
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--- a/gcc/mode-switching.cc
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+++ b/gcc/mode-switching.cc
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@@ -555,6 +555,8 @@ optimize_mode_switching (void)
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bitmap_vector_clear (antic, last_basic_block_for_fn (cfun));
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bitmap_vector_clear (comp, last_basic_block_for_fn (cfun));
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+ auto_sbitmap transp_all (last_basic_block_for_fn (cfun));
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+
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for (j = n_entities - 1; j >= 0; j--)
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{
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int e = entity_map[j];
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@@ -562,6 +564,8 @@ optimize_mode_switching (void)
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struct bb_info *info = bb_info[j];
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rtx_insn *insn;
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+ bitmap_ones (transp_all);
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+
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/* Determine what the first use (if any) need for a mode of entity E is.
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This will be the mode that is anticipatable for this block.
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Also compute the initial transparency settings. */
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@@ -594,8 +598,7 @@ optimize_mode_switching (void)
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ins_pos = NEXT_INSN (ins_pos);
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ptr = new_seginfo (no_mode, no_mode, ins_pos, live_now);
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add_seginfo (&tail_ptr, ptr);
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- for (i = 0; i < no_mode; i++)
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- clear_mode_bit (transp[bb->index], j, i);
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+ bitmap_clear_bit (transp_all, bb->index);
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}
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}
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@@ -610,8 +613,7 @@ optimize_mode_switching (void)
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{
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ptr = new_seginfo (last_mode, mode, insn, live_now);
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add_seginfo (&tail_ptr, ptr);
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- for (i = 0; i < no_mode; i++)
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- clear_mode_bit (transp[bb->index], j, i);
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+ bitmap_clear_bit (transp_all, bb->index);
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any_set_required = true;
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last_mode = mode;
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}
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@@ -642,8 +644,7 @@ optimize_mode_switching (void)
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ptr = new_seginfo (last_mode, no_mode, BB_END (bb), live_now);
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add_seginfo (&tail_ptr, ptr);
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if (last_mode != no_mode)
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- for (i = 0; i < no_mode; i++)
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- clear_mode_bit (transp[bb->index], j, i);
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+ bitmap_clear_bit (transp_all, bb->index);
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}
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}
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if (targetm.mode_switching.entry && targetm.mode_switching.exit)
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@@ -666,8 +667,7 @@ optimize_mode_switching (void)
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an extra check in make_preds_opaque. We also
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need this to avoid confusing pre_edge_lcm when
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antic is cleared but transp and comp are set. */
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- for (i = 0; i < no_mode; i++)
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- clear_mode_bit (transp[bb->index], j, i);
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+ bitmap_clear_bit (transp_all, bb->index);
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/* Insert a fake computing definition of MODE into entry
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blocks which compute no mode. This represents the mode on
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@@ -687,6 +687,9 @@ optimize_mode_switching (void)
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FOR_EACH_BB_FN (bb, cfun)
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{
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+ if (!bitmap_bit_p (transp_all, bb->index))
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+ clear_mode_bit (transp[bb->index], j, m);
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+
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if (info[bb->index].seginfo->mode == m)
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set_mode_bit (antic[bb->index], j, m);
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--
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2.33.0
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