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* [gcc r12-6550] inliner: Don't emit copy stmts for empty type parameters [PR103989]
@ 2022-01-13 15:01 Jakub Jelinek
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From: Jakub Jelinek @ 2022-01-13 15:01 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:53ead5787921be799593232cfc9931f916b79002
commit r12-6550-g53ead5787921be799593232cfc9931f916b79002
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Jan 13 15:59:47 2022 +0100
inliner: Don't emit copy stmts for empty type parameters [PR103989]
The following patch avoids emitting a parameter copy statement when inlining
if the parameter has empty type. E.g. the gimplifier does something similar
(except that it needs to evaluate side-effects if any, which isn't the case
here):
/* For empty types only gimplify the left hand side and right hand
side as statements and throw away the assignment. Do this after
gimplify_modify_expr_rhs so we handle TARGET_EXPRs of addressable
types properly. */
if (is_empty_type (TREE_TYPE (*from_p))
&& !want_value
/* Don't do this for calls that return addressable types, expand_call
relies on those having a lhs. */
&& !(TREE_ADDRESSABLE (TREE_TYPE (*from_p))
&& TREE_CODE (*from_p) == CALL_EXPR))
{
gimplify_stmt (from_p, pre_p);
gimplify_stmt (to_p, pre_p);
*expr_p = NULL_TREE;
return GS_ALL_DONE;
}
Unfortunately, this patch doesn't cure the uninit warnings in that PR,
which is caused by ipa inlining happening even at -Og when the post-IPA
-Og passes don't expect the need to clean up after ipa inlining,
but I think is desirable anyway.
2022-01-13 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/103989
* tree-inline.c (setup_one_parameter): Don't copy parms with
empty type.
Diff:
---
gcc/tree-inline.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index d7fc33eb055..8ea8de7e7cb 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -3608,7 +3608,7 @@ setup_one_parameter (copy_body_data *id, tree p, tree value, tree fn,
init_stmt = gimple_build_assign (def, rhs);
}
}
- else
+ else if (!is_empty_type (TREE_TYPE (var)))
init_stmt = gimple_build_assign (var, rhs);
if (bb && init_stmt)
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