[PATCH] enable live condition vectorization

[Richard Biener]

This removes a check preventing vectorization of live results of
vectorized conditions.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

2020-09-09  Richard Biener  <rguent...@suse.de>

        * tree-vect-stmts.c (vectorizable_condition): Allow
        STMT_VINFO_LIVE_P stmts.

        * gcc.dg/vect/vect-cond-13.c: New testcase.
        * gcc.target/i386/pr87007-4.c: Adjust.
        * gcc.target/i386/pr87007-5.c: Likewise.
---
 gcc/testsuite/gcc.dg/vect/vect-cond-13.c  | 38 +++++++++++++++++++++++
 gcc/testsuite/gcc.target/i386/pr87007-4.c |  2 +-
 gcc/testsuite/gcc.target/i386/pr87007-5.c |  2 +-
 gcc/tree-vect-stmts.c                     |  9 ------
 4 files changed, 40 insertions(+), 11 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-cond-13.c

diff --git a/gcc/testsuite/gcc.dg/vect/vect-cond-13.c 
b/gcc/testsuite/gcc.dg/vect/vect-cond-13.c
new file mode 100644
index 00000000000..2dfb8797cd8
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-cond-13.c
@@ -0,0 +1,38 @@
+/* { dg-do run } */
+
+#include "tree-vect.h"
+
+int a[1024];
+int b[1024];
+
+int
+foo ()
+{
+  int tem;
+  for (int i = 0; i < 1024; ++i)
+    {
+      if (a[i] < 0)
+        tem = -a[i] - 1;
+      else
+        tem = a[i];
+      b[i] = tem + 10;
+    }
+  return tem;
+}
+
+int main()
+{
+  check_vect ();
+
+  for (int i = 0; i < 1024; ++i)
+    {
+      a[i] = i - 333;
+      __asm__ volatile ("" ::: "memory");
+    }
+  int res = foo ();
+  if (res != 1023 - 333)
+    abort ();
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" { target 
vect_condition } } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr87007-4.c 
b/gcc/testsuite/gcc.target/i386/pr87007-4.c
index e91bdcbac44..9c4b8005af3 100644
--- a/gcc/testsuite/gcc.target/i386/pr87007-4.c
+++ b/gcc/testsuite/gcc.target/i386/pr87007-4.c
@@ -15,4 +15,4 @@ foo (int n, int k)
       d1 = ceil (d3);
 }
 
-/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 1 } } */
+/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 0 } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr87007-5.c 
b/gcc/testsuite/gcc.target/i386/pr87007-5.c
index 20d13cf650b..e4d956a5d7f 100644
--- a/gcc/testsuite/gcc.target/i386/pr87007-5.c
+++ b/gcc/testsuite/gcc.target/i386/pr87007-5.c
@@ -15,4 +15,4 @@ foo (int n, int k)
       d1 = sqrt (d3);
 }
 
-/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 1 } } */
+/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 0 } } */
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index 065d1bf3caf..e069f874f72 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -9853,15 +9853,6 @@ vectorizable_condition (vec_info *vinfo,
     {
       if (STMT_VINFO_DEF_TYPE (stmt_info) != vect_internal_def)
        return false;
-
-      /* FORNOW: only supported as part of a reduction.  */
-      if (loop_vinfo && STMT_VINFO_LIVE_P (stmt_info))
-       {
-         if (dump_enabled_p ())
-           dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
-                            "value used after loop.\n");
-         return false;
-       }
     }
 
   tree vectype = STMT_VINFO_VECTYPE (stmt_info);
-- 
2.26.2