From: Jeff Law <law@redhat.com>
Date: Thu, 21 May 2015 12:44:44 +0000 (-0600)
Subject: combine.c (find_split_point): Handle ASHIFT like MULT to encourage multiply-accumulat... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a7a629d72f2b25832c4b9c7c2b11d03da73d5546;p=gcc.git

combine.c (find_split_point): Handle ASHIFT like MULT to encourage multiply-accumulate/shift-add insn generation.

	* combine.c (find_split_point): Handle ASHIFT like MULT to encourage
	multiply-accumulate/shift-add insn generation.

	* gcc.target/hppa/shadd-2.c: New test.

From-SVN: r223481
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c02cdadc7de..f4012b79536 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-21  Jeff Law  <law@redhat.com>
+
+	* combine.c (find_split_point): Handle ASHIFT like MULT to encourage
+	multiply-accumulate/shift-add insn generation.
+
 2015-05-21  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	PR target/54236
diff --git a/gcc/combine.c b/gcc/combine.c
index a90849ed0e9..8c527a74587 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -5145,7 +5145,9 @@ find_split_point (rtx *loc, rtx_insn *insn, bool set_src)
       /* Split at a multiply-accumulate instruction.  However if this is
          the SET_SRC, we likely do not have such an instruction and it's
          worthless to try this split.  */
-      if (!set_src && GET_CODE (XEXP (x, 0)) == MULT)
+      if (!set_src
+	  && (GET_CODE (XEXP (x, 0)) == MULT
+	      || GET_CODE (XEXP (x, 0)) == ASHIFT))
         return loc;
 
     default:
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index dd6c236d906..283644cdba2 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2015-05-21  Jeff Law  <law@redhat.com>
+
+	* gcc.target/hppa/shadd-2.c: New test.
+
 2015-05-21  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	PR target/54236
diff --git a/gcc/testsuite/gcc.target/hppa/shadd-2.c b/gcc/testsuite/gcc.target/hppa/shadd-2.c
new file mode 100644
index 00000000000..34708e51597
--- /dev/null
+++ b/gcc/testsuite/gcc.target/hppa/shadd-2.c
@@ -0,0 +1,49 @@
+/* { dg-do compile }  */
+/* { dg-options "-O2" }  */
+/* { dg-final { scan-assembler-times "sh.add" 2 } }  */
+
+typedef struct rtx_def *rtx;
+typedef const struct rtx_def *const_rtx;
+enum machine_mode
+{
+  VOIDmode, BLKmode, CCmode, CCGCmode, CCGOCmode, CCNOmode, CCAmode, CCCmode,
+    CCOmode, CCSmode, CCZmode, CCFPmode, CCFPUmode, BImode, QImode, HImode,
+    SImode, DImode, TImode, OImode, QQmode, HQmode, SQmode, DQmode, TQmode,
+    UQQmode, UHQmode, USQmode, UDQmode, UTQmode, HAmode, SAmode, DAmode,
+    TAmode, UHAmode, USAmode, UDAmode, UTAmode, SFmode, DFmode, XFmode,
+    TFmode, SDmode, DDmode, TDmode, CQImode, CHImode, CSImode, CDImode,
+    CTImode, COImode, SCmode, DCmode, XCmode, TCmode, V2QImode, V4QImode,
+    V2HImode, V1SImode, V8QImode, V4HImode, V2SImode, V1DImode, V16QImode,
+    V8HImode, V4SImode, V2DImode, V1TImode, V32QImode, V16HImode, V8SImode,
+    V4DImode, V2TImode, V64QImode, V32HImode, V16SImode, V8DImode, V4TImode,
+    V2SFmode, V4SFmode, V2DFmode, V8SFmode, V4DFmode, V2TFmode, V16SFmode,
+    V8DFmode, V4TFmode, MAX_MACHINE_MODE, NUM_MACHINE_MODES = MAX_MACHINE_MODE
+};
+struct rtx_def
+{
+  __extension__ enum machine_mode mode:8;
+};
+struct target_regs
+{
+  unsigned char x_hard_regno_nregs[53][MAX_MACHINE_MODE];
+};
+extern void oof (void);
+extern int rhs_regno (rtx);
+
+extern struct target_regs default_target_regs;
+__inline__ unsigned int
+end_hard_regno (enum machine_mode mode, unsigned int regno)
+{
+  return regno +
+    ((&default_target_regs)->x_hard_regno_nregs)[regno][(int) mode];
+}
+
+void
+note_btr_set (rtx dest, const_rtx set
+	      __attribute__ ((__unused__)), void *data)
+{
+  int regno, end_regno;
+  end_regno = end_hard_regno (((dest)->mode), (rhs_regno (dest)));
+  for (; regno < end_regno; regno++)
+    oof ();
+}