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* [gcc r12-7560] middle-end/104786 - ICE with asm and VLA
@ 2022-03-09 13:37 Richard Biener
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From: Richard Biener @ 2022-03-09 13:37 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:ba3ff5e35144e2afff4ccef4ccbbbbaba9870afb
commit r12-7560-gba3ff5e35144e2afff4ccef4ccbbbbaba9870afb
Author: Richard Biener <rguenther@suse.de>
Date: Wed Mar 9 10:55:49 2022 +0100
middle-end/104786 - ICE with asm and VLA
The following fixes an ICE observed with a MEM_REF allows_mem asm
operand referencing a VLA. The following makes sure to not attempt
to go the temporary creation way when we cannot.
2022-03-09 Richard Biener <rguenther@suse.de>
PR middle-end/104786
* cfgexpand.cc (expand_asm_stmt): Do not generate a copy
for VLAs without an upper size bound.
* gcc.dg/pr104786.c: New testcase.
Diff:
---
gcc/cfgexpand.cc | 4 +++-
gcc/testsuite/gcc.dg/pr104786.c | 8 ++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/gcc/cfgexpand.cc b/gcc/cfgexpand.cc
index 87536ec7ccd..4f99f040450 100644
--- a/gcc/cfgexpand.cc
+++ b/gcc/cfgexpand.cc
@@ -3297,7 +3297,9 @@ expand_asm_stmt (gasm *stmt)
&& GET_MODE (DECL_RTL (val)) != TYPE_MODE (type)))
|| ! allows_reg
|| is_inout
- || TREE_ADDRESSABLE (type))
+ || TREE_ADDRESSABLE (type)
+ || (!tree_fits_poly_int64_p (TYPE_SIZE (type))
+ && !known_size_p (max_int_size_in_bytes (type))))
{
op = expand_expr (val, NULL_RTX, VOIDmode,
!allows_reg ? EXPAND_MEMORY : EXPAND_WRITE);
diff --git a/gcc/testsuite/gcc.dg/pr104786.c b/gcc/testsuite/gcc.dg/pr104786.c
new file mode 100644
index 00000000000..3076d236d21
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr104786.c
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-std=gnu90" } */
+
+void h(void *di, int num)
+{
+ char (*t)[num] = di;
+ __asm__ ("" : "=X"( *t));
+}
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