sra: Only verify sizes of scalar accesses (PR 93845)

Message ID ri636b4upfu.fsf@suse.cz
State New
Headers show
Series
  • sra: Only verify sizes of scalar accesses (PR 93845)
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Commit Message

Martin Jambor Feb. 21, 2020, 11:53 a.m.
Hi,

the testcase is another example - in addition to recent PR 93516 - where
the SRA access verifier is confused by the fact that get_ref_base_extent
can return different sizes for the same type, depending whether they are
COMPONENT_REF or not.  In the previous bug I decided to keep the
verifier check for aggregate type even though it is not really important
and instead avoid easily detectable type-within-the-same-type situation.
This testcase is however a result of a fairly random looking type cast
and so cannot be handled in the same way.

Because the check is not really important for aggregates, this patch
simply disables it for non-register types.

Bootstrapped and tested on x86_64-linux.  OK for trunk?

Thanks,

Martin

2020-02-20  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/93845
	* tree-sra.c (verify_sra_access_forest): Only test access size of
	scalar types.

	testsuite/
	* g++.dg/tree-ssa/pr93845.C: New test.
---
 gcc/ChangeLog                           |  6 +++++
 gcc/testsuite/ChangeLog                 |  5 +++++
 gcc/testsuite/g++.dg/tree-ssa/pr93845.C | 30 +++++++++++++++++++++++++
 gcc/tree-sra.c                          |  3 ++-
 4 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/tree-ssa/pr93845.C

-- 
2.25.0

Comments

Richard Biener Feb. 21, 2020, 12:31 p.m. | #1
On Fri, 21 Feb 2020, Martin Jambor wrote:

> Hi,

> 

> the testcase is another example - in addition to recent PR 93516 - where

> the SRA access verifier is confused by the fact that get_ref_base_extent

> can return different sizes for the same type, depending whether they are

> COMPONENT_REF or not.  In the previous bug I decided to keep the

> verifier check for aggregate type even though it is not really important

> and instead avoid easily detectable type-within-the-same-type situation.

> This testcase is however a result of a fairly random looking type cast

> and so cannot be handled in the same way.

> 

> Because the check is not really important for aggregates, this patch

> simply disables it for non-register types.

> 

> Bootstrapped and tested on x86_64-linux.  OK for trunk?


OK.

Richard.

> Thanks,

> 

> Martin

> 

> 2020-02-20  Martin Jambor  <mjambor@suse.cz>

> 

> 	PR tree-optimization/93845

> 	* tree-sra.c (verify_sra_access_forest): Only test access size of

> 	scalar types.

> 

> 	testsuite/

> 	* g++.dg/tree-ssa/pr93845.C: New test.

> ---

>  gcc/ChangeLog                           |  6 +++++

>  gcc/testsuite/ChangeLog                 |  5 +++++

>  gcc/testsuite/g++.dg/tree-ssa/pr93845.C | 30 +++++++++++++++++++++++++

>  gcc/tree-sra.c                          |  3 ++-

>  4 files changed, 43 insertions(+), 1 deletion(-)

>  create mode 100644 gcc/testsuite/g++.dg/tree-ssa/pr93845.C

> 

> diff --git a/gcc/testsuite/g++.dg/tree-ssa/pr93845.C b/gcc/testsuite/g++.dg/tree-ssa/pr93845.C

> new file mode 100644

> index 00000000000..72e473fffcd

> --- /dev/null

> +++ b/gcc/testsuite/g++.dg/tree-ssa/pr93845.C

> @@ -0,0 +1,30 @@

> +/* { dg-do compile } */

> +/* { dg-options "-O1" } */

> +

> +struct g;

> +struct h {

> +  g *operator->();

> +};

> +class i {

> +  void *a;

> +  int b;

> +

> +public:

> +  template <typename f> f j() { return *static_cast<f *>(this); }

> +};

> +struct k : i {};

> +struct l : k {};

> +struct m {

> +  i n();

> +  i o(l, l, int);

> +};

> +struct g {

> +  void m_fn4(k);

> +};

> +h a;

> +i b;

> +i m::n() {

> +  l c, d, e = o(d, c, 0).j<l>();

> +  a->m_fn4(e);

> +  return b;

> +}

> diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c

> index 0cfac0a8192..1439f11f15a 100644

> --- a/gcc/tree-sra.c

> +++ b/gcc/tree-sra.c

> @@ -2339,7 +2339,8 @@ verify_sra_access_forest (struct access *root)

>        gcc_assert (offset == access->offset);

>        gcc_assert (access->grp_unscalarizable_region

>  		  || size == max_size);

> -      gcc_assert (max_size == access->size);

> +      gcc_assert (!is_gimple_reg_type (access->type)

> +		  || max_size == access->size);

>        gcc_assert (reverse == access->reverse);

>  

>        if (access->first_child)

> 


-- 
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH, Maxfeldstrasse 5, 90409 Nuernberg,
Germany; GF: Felix Imendörffer; HRB 36809 (AG Nuernberg)

Patch

diff --git a/gcc/testsuite/g++.dg/tree-ssa/pr93845.C b/gcc/testsuite/g++.dg/tree-ssa/pr93845.C
new file mode 100644
index 00000000000..72e473fffcd
--- /dev/null
+++ b/gcc/testsuite/g++.dg/tree-ssa/pr93845.C
@@ -0,0 +1,30 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+struct g;
+struct h {
+  g *operator->();
+};
+class i {
+  void *a;
+  int b;
+
+public:
+  template <typename f> f j() { return *static_cast<f *>(this); }
+};
+struct k : i {};
+struct l : k {};
+struct m {
+  i n();
+  i o(l, l, int);
+};
+struct g {
+  void m_fn4(k);
+};
+h a;
+i b;
+i m::n() {
+  l c, d, e = o(d, c, 0).j<l>();
+  a->m_fn4(e);
+  return b;
+}
diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c
index 0cfac0a8192..1439f11f15a 100644
--- a/gcc/tree-sra.c
+++ b/gcc/tree-sra.c
@@ -2339,7 +2339,8 @@  verify_sra_access_forest (struct access *root)
       gcc_assert (offset == access->offset);
       gcc_assert (access->grp_unscalarizable_region
 		  || size == max_size);
-      gcc_assert (max_size == access->size);
+      gcc_assert (!is_gimple_reg_type (access->type)
+		  || max_size == access->size);
       gcc_assert (reverse == access->reverse);
 
       if (access->first_child)