* [PATCH] PHIOPT: Improve replace_phi_edge_with_variable's dce_ssa_names slightly
@ 2023-05-03 23:11 Andrew Pinski
2023-05-04 9:39 ` Richard Biener
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Pinski @ 2023-05-03 23:11 UTC (permalink / raw)
To: gcc-patches; +Cc: Andrew Pinski
When I added the dce_ssa_names argument, I didn't realize bitmap was a
pointer so I used the default argument value as auto_bitmap(). But
instead we could just use nullptr and check if it was a nullptr
before calling simple_dce_from_worklist.
OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
gcc/ChangeLog:
* tree-ssa-phiopt.cc (replace_phi_edge_with_variable): Change
the default argument value for dce_ssa_names to nullptr.
Check to make sure dce_ssa_names is a non-nullptr before
calling simple_dce_from_worklist.
---
gcc/tree-ssa-phiopt.cc | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc
index 37b98ef3c52..fbc1fd66607 100644
--- a/gcc/tree-ssa-phiopt.cc
+++ b/gcc/tree-ssa-phiopt.cc
@@ -89,7 +89,7 @@ single_non_singleton_phi_for_edges (gimple_seq seq, edge e0, edge e1)
static void
replace_phi_edge_with_variable (basic_block cond_block,
edge e, gphi *phi, tree new_tree,
- bitmap dce_ssa_names = auto_bitmap())
+ bitmap dce_ssa_names = nullptr)
{
basic_block bb = gimple_bb (phi);
gimple_stmt_iterator gsi;
@@ -164,7 +164,8 @@ replace_phi_edge_with_variable (basic_block cond_block,
gimple_cond_make_true (cond);
}
- simple_dce_from_worklist (dce_ssa_names);
+ if (dce_ssa_names)
+ simple_dce_from_worklist (dce_ssa_names);
statistics_counter_event (cfun, "Replace PHI with variable", 1);
--
2.31.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] PHIOPT: Improve replace_phi_edge_with_variable's dce_ssa_names slightly
2023-05-03 23:11 [PATCH] PHIOPT: Improve replace_phi_edge_with_variable's dce_ssa_names slightly Andrew Pinski
@ 2023-05-04 9:39 ` Richard Biener
0 siblings, 0 replies; 2+ messages in thread
From: Richard Biener @ 2023-05-04 9:39 UTC (permalink / raw)
To: Andrew Pinski; +Cc: gcc-patches
On Thu, May 4, 2023 at 1:11 AM Andrew Pinski via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> When I added the dce_ssa_names argument, I didn't realize bitmap was a
> pointer so I used the default argument value as auto_bitmap(). But
> instead we could just use nullptr and check if it was a nullptr
> before calling simple_dce_from_worklist.
>
> OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
OK.
> gcc/ChangeLog:
>
> * tree-ssa-phiopt.cc (replace_phi_edge_with_variable): Change
> the default argument value for dce_ssa_names to nullptr.
> Check to make sure dce_ssa_names is a non-nullptr before
> calling simple_dce_from_worklist.
> ---
> gcc/tree-ssa-phiopt.cc | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc
> index 37b98ef3c52..fbc1fd66607 100644
> --- a/gcc/tree-ssa-phiopt.cc
> +++ b/gcc/tree-ssa-phiopt.cc
> @@ -89,7 +89,7 @@ single_non_singleton_phi_for_edges (gimple_seq seq, edge e0, edge e1)
> static void
> replace_phi_edge_with_variable (basic_block cond_block,
> edge e, gphi *phi, tree new_tree,
> - bitmap dce_ssa_names = auto_bitmap())
> + bitmap dce_ssa_names = nullptr)
> {
> basic_block bb = gimple_bb (phi);
> gimple_stmt_iterator gsi;
> @@ -164,7 +164,8 @@ replace_phi_edge_with_variable (basic_block cond_block,
> gimple_cond_make_true (cond);
> }
>
> - simple_dce_from_worklist (dce_ssa_names);
> + if (dce_ssa_names)
> + simple_dce_from_worklist (dce_ssa_names);
>
> statistics_counter_event (cfun, "Replace PHI with variable", 1);
>
> --
> 2.31.1
>
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