[gcc r11-11142] middle-end/111818 - failed DECL_NOT_GIMPLE_REG_P setting of volatile
Richard Biener
rguenth@gcc.gnu.org
Fri Dec 15 12:18:17 GMT 2023
https://gcc.gnu.org/g:45c296f2d81f6259e268e07707b4aa87dffba20a
commit r11-11142-g45c296f2d81f6259e268e07707b4aa87dffba20a
Author: Richard Biener <rguenther@suse.de>
Date: Mon Oct 16 12:50:46 2023 +0200
middle-end/111818 - failed DECL_NOT_GIMPLE_REG_P setting of volatile
The following addresses a missed DECL_NOT_GIMPLE_REG_P setting of
a volatile declared parameter which causes inlining to substitute
a constant parameter into a context where its address is required.
The main issue is in update_address_taken which clears
DECL_NOT_GIMPLE_REG_P from the parameter but fails to rewrite it
because is_gimple_reg returns false for volatiles. The following
changes maybe_optimize_var to make the 1:1 correspondence between
clearing DECL_NOT_GIMPLE_REG_P of a register typed decl and
actually rewriting it to SSA.
PR middle-end/111818
* tree-ssa.c (maybe_optimize_var): When clearing
DECL_NOT_GIMPLE_REG_P always rewrite into SSA.
* gcc.dg/torture/pr111818.c: New testcase.
(cherry picked from commit ce55521bcd149fdc431f1d78e706b66d470210ae)
Diff:
---
gcc/testsuite/gcc.dg/torture/pr111818.c | 11 +++++++++++
gcc/tree-ssa.c | 17 +++++++++++------
2 files changed, 22 insertions(+), 6 deletions(-)
diff --git a/gcc/testsuite/gcc.dg/torture/pr111818.c b/gcc/testsuite/gcc.dg/torture/pr111818.c
new file mode 100644
index 00000000000..a7a91111d71
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr111818.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+
+static void foo(const volatile unsigned int x, void *p)
+{
+ __builtin_memcpy(p, (void *)&x, sizeof x);
+}
+
+void bar(void *number)
+{
+ foo(0, number);
+}
diff --git a/gcc/tree-ssa.c b/gcc/tree-ssa.c
index 41959ca03f8..dd3b65a0f67 100644
--- a/gcc/tree-ssa.c
+++ b/gcc/tree-ssa.c
@@ -1644,15 +1644,20 @@ maybe_optimize_var (tree var, bitmap addresses_taken, bitmap not_reg_needs,
maybe_reg = true;
DECL_NOT_GIMPLE_REG_P (var) = 0;
}
- if (maybe_reg && is_gimple_reg (var))
+ if (maybe_reg)
{
- if (dump_file)
+ if (is_gimple_reg (var))
{
- fprintf (dump_file, "Now a gimple register: ");
- print_generic_expr (dump_file, var);
- fprintf (dump_file, "\n");
+ if (dump_file)
+ {
+ fprintf (dump_file, "Now a gimple register: ");
+ print_generic_expr (dump_file, var);
+ fprintf (dump_file, "\n");
+ }
+ bitmap_set_bit (suitable_for_renaming, DECL_UID (var));
}
- bitmap_set_bit (suitable_for_renaming, DECL_UID (var));
+ else
+ DECL_NOT_GIMPLE_REG_P (var) = 1;
}
}
}
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