[PATCH v3 2/4] ree : Code movement to avoid adding prototype to improve ree pass for rs6000 target.

[PATCH v3 2/4] ree : Code movement to avoid adding prototype to improve ree pass for rs6000 target.

[Ajit Agarwal]

Hello All:

This is the patch-2 to improve ree pass for rs6000 target.
Bootstrapped and regtested on powerpc64-gnu-linux.

Thanks & Regards
Ajit

	ree: Improve ree pass for rs6000 target.

	For rs6000 target we see redundant zero and sign
	extension and done to improve ree pass to eliminate
	 such redundant zero and sign extension.

	2023-04-19  Ajit Kumar Agarwal  <aagarwa1@linux.ibm.com>

gcc/ChangeLog:

	* ree.cc (get_defs): Move function to avoid prototype.
---
 gcc/ree.cc | 94 +++++++++++++++++++++++++++---------------------------
 1 file changed, 47 insertions(+), 47 deletions(-)

diff --git a/gcc/ree.cc b/gcc/ree.cc
index 413aec7c8eb..93d300a9e96 100644
--- a/gcc/ree.cc
+++ b/gcc/ree.cc
@@ -253,6 +253,53 @@ struct ext_cand
 
 static int max_insn_uid;
 
+/* Get all the reaching definitions of an instruction.  The definitions are
+   desired for REG used in INSN.  Return the definition list or NULL if a
+   definition is missing.  If DEST is non-NULL, additionally push the INSN
+   of the definitions onto DEST.  */
+
+static struct df_link *
+get_defs (rtx_insn *insn, rtx reg, vec<rtx_insn *> *dest)
+{
+  df_ref use;
+  struct df_link *ref_chain, *ref_link;
+
+  FOR_EACH_INSN_USE (use, insn)
+    {
+      if (GET_CODE (DF_REF_REG (use)) == SUBREG)
+	return NULL;
+      if (REGNO (DF_REF_REG (use)) == REGNO (reg))
+	break;
+    }
+
+  if (use == NULL)
+    return NULL;
+
+  ref_chain = DF_REF_CHAIN (use);
+
+  for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)
+    {
+      /* Problem getting some definition for this instruction.  */
+      if (ref_link->ref == NULL)
+	return NULL;
+      if (DF_REF_INSN_INFO (ref_link->ref) == NULL)
+	return NULL;
+      /* As global regs are assumed to be defined at each function call
+	 dataflow can report a call_insn as being a definition of REG.
+	 But we can't do anything with that in this pass so proceed only
+	 if the instruction really sets REG in a way that can be deduced
+	 from the RTL structure.  */
+      if (global_regs[REGNO (reg)]
+	  && !set_of (reg, DF_REF_INSN (ref_link->ref)))
+	return NULL;
+    }
+
+  if (dest)
+    for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)
+      dest->safe_push (DF_REF_INSN (ref_link->ref));
+
+  return ref_chain;
+}
 /* Update or remove REG_EQUAL or REG_EQUIV notes for INSN.  */
 
 static bool
@@ -454,53 +501,6 @@ transform_ifelse (ext_cand *cand, rtx_insn *def_insn)
   return false;
 }
 
-/* Get all the reaching definitions of an instruction.  The definitions are
-   desired for REG used in INSN.  Return the definition list or NULL if a
-   definition is missing.  If DEST is non-NULL, additionally push the INSN
-   of the definitions onto DEST.  */
-
-static struct df_link *
-get_defs (rtx_insn *insn, rtx reg, vec<rtx_insn *> *dest)
-{
-  df_ref use;
-  struct df_link *ref_chain, *ref_link;
-
-  FOR_EACH_INSN_USE (use, insn)
-    {
-      if (GET_CODE (DF_REF_REG (use)) == SUBREG)
-        return NULL;
-      if (REGNO (DF_REF_REG (use)) == REGNO (reg))
-	break;
-    }
-
-  gcc_assert (use != NULL);
-
-  ref_chain = DF_REF_CHAIN (use);
-
-  for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)
-    {
-      /* Problem getting some definition for this instruction.  */
-      if (ref_link->ref == NULL)
-        return NULL;
-      if (DF_REF_INSN_INFO (ref_link->ref) == NULL)
-        return NULL;
-      /* As global regs are assumed to be defined at each function call
-	 dataflow can report a call_insn as being a definition of REG.
-	 But we can't do anything with that in this pass so proceed only
-	 if the instruction really sets REG in a way that can be deduced
-	 from the RTL structure.  */
-      if (global_regs[REGNO (reg)]
-	  && !set_of (reg, DF_REF_INSN (ref_link->ref)))
-	return NULL;
-    }
-
-  if (dest)
-    for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)
-      dest->safe_push (DF_REF_INSN (ref_link->ref));
-
-  return ref_chain;
-}
-
 /* Get all the reaching uses of an instruction.  The uses are desired for REG
    set in INSN.  Return use list or NULL if a use is missing or irregular.  */
 
-- 
2.31.1