Hi,
PR 112822 revealed a corner case in load_assign_lhs_subreplacements
where it creates invalid gimple: an assignment where on the LHS there
is a complex variable which however is not a gimple register because
it has partial defs and on the right hand side there is a
VIEW_CONVERT_EXPR. This patch invokes force_gimple_operand_gsi on
such statements (like it already does when both sides of a generated
assignment have partial definitions.
I've made sure the patch passes bootstrap and testsuite on x86_64-linux,
the bug reporter was kind enough to also check the same on an
powerpc64le-linux (see bugzilla comment #8).
The testcase has reasonable size but it is specific to ppc64le and its
altivec vectors. My plan is to ask the bug reporter to massage it into
a target specific testcase in bugzilla. Alternatively I can try to
craft a testcase from scratch but that will take time.
Despite the above, is the patch OK for master?
Thanks,
Martin
gcc/ChangeLog:
2023-12-12 Martin Jambor <mjam...@suse.cz>
PR tree-optimization/112822
* tree-sra.cc (load_assign_lhs_subreplacements): Invoke
force_gimple_operand_gsi also when LHS has partial stores and RHS is a
VIEW_CONVERT_EXPR.
---
gcc/tree-sra.cc | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/gcc/tree-sra.cc b/gcc/tree-sra.cc
index 3bd0c7a9af0..99a1b0a6d17 100644
--- a/gcc/tree-sra.cc
+++ b/gcc/tree-sra.cc
@@ -4219,11 +4219,15 @@ load_assign_lhs_subreplacements (struct access *lacc,
if (racc && racc->grp_to_be_replaced)
{
rhs = get_access_replacement (racc);
+ bool vce = false;
if (!useless_type_conversion_p (lacc->type, racc->type))
- rhs = fold_build1_loc (sad->loc, VIEW_CONVERT_EXPR,
- lacc->type, rhs);
+ {
+ rhs = fold_build1_loc (sad->loc, VIEW_CONVERT_EXPR,
+ lacc->type, rhs);
+ vce = true;
+ }
- if (racc->grp_partial_lhs && lacc->grp_partial_lhs)
+ if (lacc->grp_partial_lhs && (vce || racc->grp_partial_lhs))
rhs = force_gimple_operand_gsi (&sad->old_gsi, rhs, true,
NULL_TREE, true, GSI_SAME_STMT);
}
--
2.43.0
