[gcc(refs/users/guojiufu/heads/guojiufu-branch)] unroll param for calls and branches

[Jiu Fu Guo]

https://gcc.gnu.org/g:aabf7bfd48c37c77f01f62a076f22d93b7670f81

commit aabf7bfd48c37c77f01f62a076f22d93b7670f81
Author: guojiufu <guojiufu@linux.ibm.com>
Date:   Mon Jul 20 16:03:41 2020 +0800

    unroll param for calls and branches

Diff:
---
 gcc/config/rs6000/rs6000.c | 4 ++--
 gcc/params.opt             | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 397ec8a4954..fcb4e782f96 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -5155,8 +5155,8 @@ num_loop_calls (struct loop *loop)
 static bool
 rs6000_complex_loop_p (struct loop *loop)
 {
-  return num_loop_calls (loop) > 0
-    || num_loop_branches (loop) > 2 || !single_exit (loop);
+  return num_loop_calls (loop) > param_max_unrolled_calls
+    || num_loop_branches (loop) > param_max_unrolled_branches;
 }
 
 /* Implement targetm.loop_unroll_adjust.  */
diff --git a/gcc/params.opt b/gcc/params.opt
index e29a44e7712..142ba989998 100644
--- a/gcc/params.opt
+++ b/gcc/params.opt
@@ -638,6 +638,15 @@ The maximum number of unrollings of a single loop.
 Common Joined UInteger Var(param_max_unrolled_insns) Init(200) Param Optimization
 The maximum number of instructions to consider to unroll in a loop.
 
+-param=max-unrolled-calls=
+Common Joined UInteger Var(param_max_unrolled_calls) Init(2) Param Optimization
+The maximum number of calls to consider to unroll in a loop.
+
+-param=max-unrolled-branches=
+Common Joined UInteger Var(param_max_unrolled_branches) Init(4) Param Optimization
+The maximum number of branches to consider to unroll in a loop.
+
+
 -param=max-unswitch-insns=
 Common Joined UInteger Var(param_max_unswitch_insns) Init(50) Param Optimization
 The maximum number of insns of an unswitched loop.