Re: [PATCH, MIPS]: Remove ugly hack from "call_internal" splitter

[Uros Bizjak <ubizjak@gmail.com>]

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On Wed, Nov 3, 2010 at 10:23 PM, Richard Sandiford
<rdsandiford@googlemail.com> wrote:
> Uros Bizjak <ubizjak@gmail.com> writes:
>> Hello!
>>
>> We should simply use curr_insn instead of an ugly hack.
>>
>> 2010-11-02  Uros Bizjak  <ubizjak@gmail.com>
>>
>>       * config/mips/mips.md (call_internal): Pass curr_insn to
>>       mips_split_call.
>>
>> Compile tested on x86_64-pc-linux-gnu for mips-elf cross.
>
> Please do the call splitters too.  OK with that change if it
> passes regression testing.

In addition to other call splitters, I noticed that mips_split_call
copies CALL_INSN_FUNCTION_USAGE to splitted call_insn pattern. This is
not necessary, since try_split will do that automatically (se
emit-rtl.c, around line 3459).

2010-11-03  Uros Bizjak  <ubizjak@gmail.com>

	* config/mips/mips.md (call_internal): Pass curr_insn to
	mips_split_call.
	(call_internal_direct): Ditto.
	(call_value_internal): Ditto.
	(call_value_internal_direct): Ditto.
	(call_value_multiple_internal): Ditto.
	* config/mips/mips.c (mips_split_call): Do not copy
	CALL_INSN_FUNCTION_USAGE here.

Attached patch was tested by building a cross to mips-elf.
Unfortunatelly, I have no access to real mips target, so I would like
to ask somebody if can do a regression test of attached patch.

Uros.

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Index: gcc/config/mips/mips.md
===================================================================
--- gcc/config/mips/mips.md	(revision 166247)
+++ gcc/config/mips/mips.md	(working copy)
@@ -6033,18 +6033,16 @@
 ;;     But once we generate the separate insns, it becomes obvious that
 ;;     $gp is not live on entry to the call.
 ;;
-;; ??? The operands[2] = insn check is a hack to make the original insn
-;; available to the splitter.
 (define_insn_and_split "call_internal"
   [(call (mem:SI (match_operand 0 "call_insn_operand" "c,S"))
 	 (match_operand 1 "" ""))
    (clobber (reg:SI RETURN_ADDR_REGNUM))]
   ""
   { return TARGET_SPLIT_CALLS ? "#" : MIPS_CALL ("jal", operands, 0, 1); }
-  "reload_completed && TARGET_SPLIT_CALLS && (operands[2] = insn)"
+  "reload_completed && TARGET_SPLIT_CALLS"
   [(const_int 0)]
 {
-  mips_split_call (operands[2], gen_call_split (operands[0], operands[1]));
+  mips_split_call (curr_insn, gen_call_split (operands[0], operands[1]));
   DONE;
 }
   [(set_attr "jal" "indirect,direct")])
@@ -6069,10 +6067,10 @@
    (clobber (reg:SI RETURN_ADDR_REGNUM))]
   ""
   { return TARGET_SPLIT_CALLS ? "#" : MIPS_CALL ("jal", operands, 0, -1); }
-  "reload_completed && TARGET_SPLIT_CALLS && (operands[2] = insn)"
+  "reload_completed && TARGET_SPLIT_CALLS"
   [(const_int 0)]
 {
-  mips_split_call (operands[2],
+  mips_split_call (curr_insn,
 		   gen_call_direct_split (operands[0], operands[1]));
   DONE;
 }
@@ -6108,10 +6106,10 @@
    (clobber (reg:SI RETURN_ADDR_REGNUM))]
   ""
   { return TARGET_SPLIT_CALLS ? "#" : MIPS_CALL ("jal", operands, 1, 2); }
-  "reload_completed && TARGET_SPLIT_CALLS && (operands[3] = insn)"
+  "reload_completed && TARGET_SPLIT_CALLS"
   [(const_int 0)]
 {
-  mips_split_call (operands[3],
+  mips_split_call (curr_insn,
 		   gen_call_value_split (operands[0], operands[1],
 					 operands[2]));
   DONE;
@@ -6137,10 +6135,10 @@
    (clobber (reg:SI RETURN_ADDR_REGNUM))]
   ""
   { return TARGET_SPLIT_CALLS ? "#" : MIPS_CALL ("jal", operands, 1, -1); }
-  "reload_completed && TARGET_SPLIT_CALLS && (operands[3] = insn)"
+  "reload_completed && TARGET_SPLIT_CALLS"
   [(const_int 0)]
 {
-  mips_split_call (operands[3],
+  mips_split_call (curr_insn,
 		   gen_call_value_direct_split (operands[0], operands[1],
 						operands[2]));
   DONE;
@@ -6169,10 +6167,10 @@
    (clobber (reg:SI RETURN_ADDR_REGNUM))]
   ""
   { return TARGET_SPLIT_CALLS ? "#" : MIPS_CALL ("jal", operands, 1, 2); }
-  "reload_completed && TARGET_SPLIT_CALLS && (operands[4] = insn)"
+  "reload_completed && TARGET_SPLIT_CALLS"
   [(const_int 0)]
 {
-  mips_split_call (operands[4],
+  mips_split_call (curr_insn,
 		   gen_call_value_multiple_split (operands[0], operands[1],
 						  operands[2], operands[3]));
   DONE;
Index: gcc/config/mips/mips.c
===================================================================
--- gcc/config/mips/mips.c	(revision 166247)
+++ gcc/config/mips/mips.c	(working copy)
@@ -6519,8 +6519,6 @@ mips_split_call (rtx insn, rtx call_patt
   rtx new_insn;
 
   new_insn = emit_call_insn (call_pattern);
-  CALL_INSN_FUNCTION_USAGE (new_insn)
-    = copy_rtx (CALL_INSN_FUNCTION_USAGE (insn));
   if (!find_reg_note (insn, REG_NORETURN, 0))
     /* Pick a temporary register that is suitable for both MIPS16 and
        non-MIPS16 code.  $4 and $5 are used for returning complex double