From 805a7aec3ddab49b92bf2d5c1a3e288860cc14bf Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Thu, 20 Oct 2022 10:37:35 +0100
Subject: [PATCH 030/157] [Backport][SME] aarch64: Commonise some folding code

Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=df99e9e42094dee0833ac38f53e7fae09b4d133c

Add an aarch64_sve::gimple_folder helper for folding calls
to integer constants.  SME will make more use of this.

gcc/
	* config/aarch64/aarch64-sve-builtins.h
	(gimple_folder::fold_to_cstu): New member function.
	* config/aarch64/aarch64-sve-builtins.cc
	(gimple_folder::fold_to_cstu): Define.
	* config/aarch64/aarch64-sve-builtins-base.cc
	(svcnt_bhwd_impl::fold): Use it.
---
 gcc/config/aarch64/aarch64-sve-builtins-base.cc | 9 ++-------
 gcc/config/aarch64/aarch64-sve-builtins.cc      | 7 +++++++
 gcc/config/aarch64/aarch64-sve-builtins.h       | 1 +
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/gcc/config/aarch64/aarch64-sve-builtins-base.cc b/gcc/config/aarch64/aarch64-sve-builtins-base.cc
index c24c05487..56c9d75e7 100644
--- a/gcc/config/aarch64/aarch64-sve-builtins-base.cc
+++ b/gcc/config/aarch64/aarch64-sve-builtins-base.cc
@@ -516,9 +516,7 @@ public:
   gimple *
   fold (gimple_folder &f) const OVERRIDE
   {
-    tree count = build_int_cstu (TREE_TYPE (f.lhs),
-				 GET_MODE_NUNITS (m_ref_mode));
-    return gimple_build_assign (f.lhs, count);
+    return f.fold_to_cstu (GET_MODE_NUNITS (m_ref_mode));
   }
 
   rtx
@@ -553,10 +551,7 @@ public:
     unsigned int elements_per_vq = 128 / GET_MODE_UNIT_BITSIZE (m_ref_mode);
     HOST_WIDE_INT value = aarch64_fold_sve_cnt_pat (pattern, elements_per_vq);
     if (value >= 0)
-      {
-	tree count = build_int_cstu (TREE_TYPE (f.lhs), value);
-	return gimple_build_assign (f.lhs, count);
-      }
+      return f.fold_to_cstu (value);
 
     return NULL;
   }
diff --git a/gcc/config/aarch64/aarch64-sve-builtins.cc b/gcc/config/aarch64/aarch64-sve-builtins.cc
index a70e3a6b4..e168c8334 100644
--- a/gcc/config/aarch64/aarch64-sve-builtins.cc
+++ b/gcc/config/aarch64/aarch64-sve-builtins.cc
@@ -2615,6 +2615,13 @@ gimple_folder::redirect_call (const function_instance &instance)
   return call;
 }
 
+/* Fold the call to constant VAL.  */
+gimple *
+gimple_folder::fold_to_cstu (poly_uint64 val)
+{
+  return gimple_build_assign (lhs, build_int_cstu (TREE_TYPE (lhs), val));
+}
+
 /* Fold the call to a PTRUE, taking the element size from type suffix 0.  */
 gimple *
 gimple_folder::fold_to_ptrue ()
diff --git a/gcc/config/aarch64/aarch64-sve-builtins.h b/gcc/config/aarch64/aarch64-sve-builtins.h
index 63d1db776..0d130b871 100644
--- a/gcc/config/aarch64/aarch64-sve-builtins.h
+++ b/gcc/config/aarch64/aarch64-sve-builtins.h
@@ -500,6 +500,7 @@ public:
   tree load_store_cookie (tree);
 
   gimple *redirect_call (const function_instance &);
+  gimple *fold_to_cstu (poly_uint64);
   gimple *fold_to_pfalse ();
   gimple *fold_to_ptrue ();
   gimple *fold_to_vl_pred (unsigned int);
-- 
2.33.0