[PATCH]middle-end: don't lower past veclower [PR106063]

[Tamar Christina via Gcc-patches]

Hi All,

My previous patch can cause a problem if the pattern matches after veclower
as it may replace the construct with a vector sequence which the target may not
directly support.

As such don't perform the rewriting if after veclower.

Bootstrapped Regtested on aarch64-none-linux-gnu, x86_64-pc-linux-gnu
and no issues.

Ok for master? and backport to GCC 12?

Thanks,
Tamar


gcc/ChangeLog:

        PR tree-optimization/106063
        * match.pd: Do not apply pattern after veclower.

gcc/testsuite/ChangeLog:

        PR tree-optimization/106063
        * gcc.dg/pr106063.c: New test.

--- inline copy of patch -- 
diff --git a/gcc/match.pd b/gcc/match.pd
index 
40c09bedadb89dabb6622559a8f69df5384e61fd..ba161892a98756c0278dc40fc377d7d0deaacbcf
 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -6040,7 +6040,8 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (simplify
    (cmp (bit_and:c@2 @0 cst@1) integer_zerop)
     (with { tree csts = bitmask_inv_cst_vector_p (@1); }
-     (if (csts && (VECTOR_TYPE_P (TREE_TYPE (@1)) || single_use (@2)))
+     (if (csts && (VECTOR_TYPE_P (TREE_TYPE (@1)) || single_use (@2))
+         && optimize_vectors_before_lowering_p ())
       (if (TYPE_UNSIGNED (TREE_TYPE (@1)))
        (icmp @0 { csts; })
        (with { tree utype = unsigned_type_for (TREE_TYPE (@1)); }
diff --git a/gcc/testsuite/gcc.dg/pr106063.c b/gcc/testsuite/gcc.dg/pr106063.c
new file mode 100644
index 
0000000000000000000000000000000000000000..b23596724f6bb98c53af2dce77d31509bab10378
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr106063.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-tree-forwprop --disable-tree-evrp" } */
+typedef __int128 __attribute__((__vector_size__ (16))) V;
+
+V
+foo (V v)
+{
+  return (v & (V){15}) == v;
+}




-- 

diff --git a/gcc/match.pd b/gcc/match.pd
index 
40c09bedadb89dabb6622559a8f69df5384e61fd..ba161892a98756c0278dc40fc377d7d0deaacbcf
 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -6040,7 +6040,8 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (simplify
    (cmp (bit_and:c@2 @0 cst@1) integer_zerop)
     (with { tree csts = bitmask_inv_cst_vector_p (@1); }
-     (if (csts && (VECTOR_TYPE_P (TREE_TYPE (@1)) || single_use (@2)))
+     (if (csts && (VECTOR_TYPE_P (TREE_TYPE (@1)) || single_use (@2))
+         && optimize_vectors_before_lowering_p ())
       (if (TYPE_UNSIGNED (TREE_TYPE (@1)))
        (icmp @0 { csts; })
        (with { tree utype = unsigned_type_for (TREE_TYPE (@1)); }
diff --git a/gcc/testsuite/gcc.dg/pr106063.c b/gcc/testsuite/gcc.dg/pr106063.c
new file mode 100644
index 
0000000000000000000000000000000000000000..b23596724f6bb98c53af2dce77d31509bab10378
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr106063.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-tree-forwprop --disable-tree-evrp" } */
+typedef __int128 __attribute__((__vector_size__ (16))) V;
+
+V
+foo (V v)
+{
+  return (v & (V){15}) == v;
+}