From: Eric Botcazou <ebotcazou@adacore.com>
Date: Mon, 16 Nov 2015 12:19:22 +0000 (+0000)
Subject: sparc.c (sparc_emit_probe_stack_range): Adjust.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=632b09212386db8c68978befb8dc0d2745988b7c;p=gcc.git

sparc.c (sparc_emit_probe_stack_range): Adjust.

	* config/sparc/sparc.c (sparc_emit_probe_stack_range): Adjust.
	(output_probe_stack_range): Rotate the loop and simplify.

From-SVN: r230414
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 04c4d5e5fc1..889f434c049 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-11-16  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* config/sparc/sparc.c (sparc_emit_probe_stack_range): Adjust.
+	(output_probe_stack_range): Rotate the loop and simplify.
+
 2015-11-16  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* config/rs6000/rs6000.c (rs6000_emit_probe_stack_rang): Adjust.
diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index 23f112583c2..93287235b8f 100644
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -5058,9 +5058,9 @@ sparc_emit_probe_stack_range (HOST_WIDE_INT first, HOST_WIDE_INT size)
       emit_stack_probe (plus_constant (Pmode, g1, -size));
     }
 
-  /* The run-time loop is made up of 10 insns in the generic case while the
+  /* The run-time loop is made up of 9 insns in the generic case while the
      compile-time loop is made up of 4+2*(n-2) insns for n # of intervals.  */
-  else if (size <= 5 * PROBE_INTERVAL)
+  else if (size <= 4 * PROBE_INTERVAL)
     {
       HOST_WIDE_INT i;
 
@@ -5147,41 +5147,33 @@ const char *
 output_probe_stack_range (rtx reg1, rtx reg2)
 {
   static int labelno = 0;
-  char loop_lab[32], end_lab[32];
+  char loop_lab[32];
   rtx xops[2];
 
-  ASM_GENERATE_INTERNAL_LABEL (loop_lab, "LPSRL", labelno);
-  ASM_GENERATE_INTERNAL_LABEL (end_lab, "LPSRE", labelno++);
+  ASM_GENERATE_INTERNAL_LABEL (loop_lab, "LPSRL", labelno++);
 
+  /* Loop.  */
   ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, loop_lab);
 
-   /* Jump to END_LAB if TEST_ADDR == LAST_ADDR.  */
+  /* TEST_ADDR = TEST_ADDR + PROBE_INTERVAL.  */
   xops[0] = reg1;
+  xops[1] = GEN_INT (-PROBE_INTERVAL);
+  output_asm_insn ("add\t%0, %1, %0", xops);
+
+  /* Test if TEST_ADDR == LAST_ADDR.  */
   xops[1] = reg2;
   output_asm_insn ("cmp\t%0, %1", xops);
-  if (TARGET_ARCH64)
-    fputs ("\tbe,pn\t%xcc,", asm_out_file);
-  else
-    fputs ("\tbe\t", asm_out_file);
-  assemble_name_raw (asm_out_file, end_lab);
-  fputc ('\n', asm_out_file);
-
-  /* TEST_ADDR = TEST_ADDR + PROBE_INTERVAL.  */
-  xops[1] = GEN_INT (-PROBE_INTERVAL);
-  output_asm_insn (" add\t%0, %1, %0", xops);
 
   /* Probe at TEST_ADDR and branch.  */
   if (TARGET_ARCH64)
-    fputs ("\tba,pt\t%xcc,", asm_out_file);
+    fputs ("\tbne,pt\t%xcc,", asm_out_file);
   else
-    fputs ("\tba\t", asm_out_file);
+    fputs ("\tbne\t", asm_out_file);
   assemble_name_raw (asm_out_file, loop_lab);
   fputc ('\n', asm_out_file);
   xops[1] = GEN_INT (SPARC_STACK_BIAS);
   output_asm_insn (" st\t%%g0, [%0+%1]", xops);
 
-  ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, end_lab);
-
   return "";
 }