diff mbox

[PING,^,2,AArch64] Add doloop_end pattern for -fmodulo-sched

Message ID DA41BE1DDCA941489001C7FBD7A8820E555570D2@szxema507-mbx.china.huawei.com
State New
Headers show

Commit Message

Yangfei (Felix) Nov. 13, 2014, 10:42 a.m. UTC 
> On 11/12/2014 11:01 AM, Yangfei (Felix) wrote:

> > +(define_expand "doloop_end"

> >> +  [(use (match_operand 0 "" ""))      ; loop pseudo

> >> +   (use (match_operand 1 "" ""))]     ; label

> >> +  ""

> >> +  "

> >> +{

> 

> Drop the "" surrounding the { }.

> 

> 

> r~



Hello,
    I updated the patch with the redundant "" removed.  Is it OK for trunk now? 
    I hope this patch can catch up with stage 1 of GCC-5.0.  Thanks.
diff mbox

Patch

Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog	(revision 217394)
+++ gcc/ChangeLog	(working copy)
@@ -1,3 +1,7 @@ 
+2014-11-13  Felix Yang  <felix.yang@huawei.com>
+
+	* config/aarch64/aarch64.md (doloop_end): New pattern.
+
 2014-11-11  Andrew Pinski  <apinski@cavium.com>
 
 	Bug target/61997
Index: gcc/config/aarch64/aarch64.md
===================================================================
--- gcc/config/aarch64/aarch64.md	(revision 217394)
+++ gcc/config/aarch64/aarch64.md	(working copy)
@@ -4087,6 +4087,47 @@ 
   [(set_attr "type" "mrs")])
 
 
+;; Define the subtract-one-and-jump insns so loop.c
+;; knows what to generate.
+(define_expand "doloop_end"
+  [(use (match_operand 0 "" ""))      ; loop pseudo
+   (use (match_operand 1 "" ""))]     ; label
+  ""
+{
+  /* Currently SMS relies on the do-loop pattern to recognize loops
+     where (1) the control part consists of all insns defining and/or
+     using a certain 'count' register and (2) the loop count can be
+     adjusted by modifying this register prior to the loop.
+     ??? The possible introduction of a new block to initialize the
+     new IV can potentially affect branch optimizations.  */
+  if (optimize > 0 && flag_modulo_sched)
+    {
+      rtx s0;
+      rtx bcomp;
+      rtx loc_ref;
+      rtx cc_reg;
+      rtx insn;
+      rtx cmp;
+
+      if (GET_MODE (operands[0]) != DImode)
+	FAIL;
+
+      s0 = operands [0];
+      insn = emit_insn (gen_adddi3_compare0 (s0, s0, GEN_INT (-1)));
+
+      cmp = XVECEXP (PATTERN (insn), 0, 0);
+      cc_reg = SET_DEST (cmp);
+      bcomp = gen_rtx_NE (VOIDmode, cc_reg, const0_rtx);
+      loc_ref = gen_rtx_LABEL_REF (VOIDmode, operands [1]);
+      emit_jump_insn (gen_rtx_SET (VOIDmode, pc_rtx,
+				   gen_rtx_IF_THEN_ELSE (VOIDmode, bcomp,
+							 loc_ref, pc_rtx)));
+      DONE;
+    }
+  else
+    FAIL;
+})
+
 ;; AdvSIMD Stuff
 (include "aarch64-simd.md")