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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
This commit is contained in:
Jan Hubicka 2008-08-31 13:40:11 +02:00 committed by Jan Hubicka
parent 8518c095a8
commit 277b4867ee
9 changed files with 116 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
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

6
gcc/predict.c
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@ -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)

4
gcc/predict.def
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@ -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. */

7
gcc/testsuite/ChangeLog
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@ -1,3 +1,10 @@
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

18
gcc/testsuite/gcc.target/i386/cold-attribute-1.c Normal file
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@ -0,0 +1,18 @@
/* { 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" } } */

14
gcc/testsuite/gcc.target/i386/cold-attribute-2.c Normal file
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@ -0,0 +1,14 @@
/* { 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" } } */

12
gcc/testsuite/gcc.target/i386/cold-attribute-3.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
#include <string.h>
int
__attribute__ ((cold))
t(int c)
{
return c * 11;
}
/* { dg-final { scan-assembler "imul" } } */

12
gcc/testsuite/gcc.target/i386/cold-attribute-4.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
#include <string.h>
int
__attribute__ ((cold))
t(int c)
{
return -1;
}
/* { dg-final { scan-assembler "orl" } } */

41
gcc/testsuite/gcc.target/i386/cold-attribute-4.s Normal file
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@ -0,0 +1,41 @@
.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