cold-attribute-1.c: New testcase.

	* gcc.target/i386/cold-attribute-1.c: New testcase.
	* gcc.target/i386/cold-attribute-2.c: New testcase.
	* gcc.target/i386/cold-attribute-3.c: New testcase.
	* gcc.target/i386/cold-attribute-4.c: New testcase.
	* predict.c (PROB_VERY_LIKELY): Make small enough so things
	become cold.
	* predict.def (PRED_NORETURN_CALL, PRED_COLD_CALL): Use it.

From-SVN: r139827

gcc/ChangeLog

+2008-08-31  Jan Hubicka  <jh@suse.cz>
+
+	* predict.c (PROB_VERY_LIKELY): Make small enough so things
+	become cold.
+	* predict.def (PRED_NORETURN_CALL, PRED_COLD_CALL): Use it.
+
 2008-08-31  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/37287

gcc/predict.c

@@ -66,8 +66,10 @@ along with GCC; see the file COPYING3.  If not see
 static sreal real_zero, real_one, real_almost_one, real_br_prob_base,
 	     real_inv_br_prob_base, real_one_half, real_bb_freq_max;
 
-/* Random guesstimation given names.  */
-#define PROB_VERY_UNLIKELY	(REG_BR_PROB_BASE / 100 - 1)
+/* Random guesstimation given names.  
+   PROV_VERY_UNLIKELY should be small enough so basic block predicted
+   by it gets bellow HOT_BB_FREQUENCY_FRANCTION.  */
+#define PROB_VERY_UNLIKELY	(REG_BR_PROB_BASE / 2000 - 1)
 #define PROB_EVEN		(REG_BR_PROB_BASE / 2)
 #define PROB_VERY_LIKELY	(REG_BR_PROB_BASE - PROB_VERY_UNLIKELY)
 #define PROB_ALWAYS		(REG_BR_PROB_BASE)

gcc/predict.def

@@ -69,11 +69,11 @@ DEF_PREDICTOR (PRED_LOOP_ITERATIONS_GUESSED, "guessed loop iterations",
 DEF_PREDICTOR (PRED_CONTINUE, "continue", HITRATE (50), 0)
 
 /* Branch to basic block containing call marked by noreturn attribute.  */
-DEF_PREDICTOR (PRED_NORETURN, "noreturn call", HITRATE (99),
+DEF_PREDICTOR (PRED_NORETURN, "noreturn call", PROB_VERY_LIKELY,
 	       PRED_FLAG_FIRST_MATCH)
 
 /* Branch to basic block containing call marked by cold function attribute.  */
-DEF_PREDICTOR (PRED_COLD_FUNCTION, "cold function call", HITRATE (99),
+DEF_PREDICTOR (PRED_COLD_FUNCTION, "cold function call", PROB_VERY_LIKELY,
 	       PRED_FLAG_FIRST_MATCH)
 
 /* Loopback edge is taken.  */

gcc/testsuite/ChangeLog

+2008-08-31  Jan Hubicka  <jh@suse.cz>
+
+	* gcc.target/i386/cold-attribute-1.c: New testcase.
+	* gcc.target/i386/cold-attribute-2.c: New testcase.
+	* gcc.target/i386/cold-attribute-3.c: New testcase.
+	* gcc.target/i386/cold-attribute-4.c: New testcase.
+
 2008-08-31  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/37287

gcc/testsuite/gcc.target/i386/cold-attribute-1.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+#include <string.h>
+static inline
+__attribute__ ((cold))
+my_cold_memset (void *a, int b,int c)
+{
+  memset (a,b,c);
+}
+t(void *a,int b,int c)
+{
+  if (a)
+    my_cold_memset (a,b,c);
+}
+
+/* The IF conditional should be predicted as cold and my_cold_memset inlined
+   for size expanding memset as rep; stosb.  */
+/* { dg-final { scan-assembler "stosb" } } */

gcc/testsuite/gcc.target/i386/cold-attribute-2.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+#include <string.h>
+t(int c)
+{
+  if (__builtin_expect (c, 0))
+    {
+      cold_hint ();
+      return c * 11;
+    }
+  return c;
+}
+
+/* { dg-final { scan-assembler "imul" } } */

gcc/testsuite/gcc.target/i386/cold-attribute-3.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+#include <string.h>
+
+int
+__attribute__ ((cold))
+t(int c)
+{
+  return c * 11;
+}
+
+/* { dg-final { scan-assembler "imul" } } */

gcc/testsuite/gcc.target/i386/cold-attribute-4.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+#include <string.h>
+
+int
+__attribute__ ((cold))
+t(int c)
+{
+  return -1;
+}
+
+/* { dg-final { scan-assembler "orl" } } */

gcc/testsuite/gcc.target/i386/cold-attribute-4.s

+	.file	"cold-attribute-4.c"
+	.text
+	.p2align 4,,15
+.globl t
+	.type	t, @function
+t:
+.LFB14:
+	movl	$-1, %eax
+	ret
+.LFE14:
+	.size	t, .-t
+	.section	.eh_frame,"a",@progbits
+.Lframe1:
+	.long	.LECIE1-.LSCIE1
+.LSCIE1:
+	.long	0x0
+	.byte	0x1
+	.string	"zR"
+	.uleb128 0x1
+	.sleb128 -8
+	.byte	0x10
+	.uleb128 0x1
+	.byte	0x3
+	.byte	0xc
+	.uleb128 0x7
+	.uleb128 0x8
+	.byte	0x90
+	.uleb128 0x1
+	.align 8
+.LECIE1:
+.LSFDE1:
+	.long	.LEFDE1-.LASFDE1
+.LASFDE1:
+	.long	.LASFDE1-.Lframe1
+	.long	.LFB14
+	.long	.LFE14-.LFB14
+	.uleb128 0x0
+	.align 8
+.LEFDE1:
+	.ident	"GCC: (GNU) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)"
+	.section	.note.GNU-stack,"",@progbits