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Increase MOVE_RATIO to 17 for Lakemont

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Larger MOVE_RATIO will always make code faster.  17 is the number with
smaller code sizes for Lakemont.

gcc/

	PR target/72839
	* config/i386/i386.c (lakemont_cost): Set MOVE_RATIO to 17.

gcc/testsuite/

	PR target/72839
	* gcc.target/i386/pr72839.c: New test.

From-SVN: r239578
This commit is contained in:
H.J. Lu 2016-08-18 14:59:46 +00:00 • committed by H.J. Lu
parent 2c71d454eb
commit 89c8878092
4 changed files with 28 additions and 1 deletions
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5
gcc/ChangeLog
View file

@ -1,3 +1,8 @@
2015-08-18 H.J. Lu <hongjiu.lu@intel.com>
PR target/72839
* config/i386/i386.c (lakemont_cost): Set MOVE_RATIO to 17.
2016-08-18 Chung-Lin Tang <cltang@codesourcery.com>
PR middle-end/70895

2
gcc/config/i386/i386.c
View file

@ -426,7 +426,7 @@ struct processor_costs lakemont_cost = {
COSTS_N_INSNS (3), /* cost of movsx */
COSTS_N_INSNS (2), /* cost of movzx */
8, /* "large" insn */
9, /* MOVE_RATIO */
17, /* MOVE_RATIO */
6, /* cost for loading QImode using movzbl */
{2, 4, 2}, /* cost of loading integer registers
in QImode, HImode and SImode.

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2015-08-18 H.J. Lu <hongjiu.lu@intel.com>
PR target/72839
* gcc.target/i386/pr72839.c: New test.
2016-08-18 Chung-Lin Tang <cltang@codesourcery.com>
PR middle-end/70895

17
gcc/testsuite/gcc.target/i386/pr72839.c Normal file
View file

@ -0,0 +1,17 @@
/* { dg-do compile } */
/* { dg-require-effective-target ia32 } */
/* { dg-options "-O2 -mtune=lakemont" } */
extern char *strcpy (char *, const char *);
void
foo (char *s)
{
strcpy (s,
"12345678123456781234567812345678123456781234567812345678"
"1234567");
}
/* { dg-final { scan-assembler-times "movl\[ \\t\]+\\$\[0-9\]+, \[0-9\]*\\(%\[^,\]+\\)" 16 } } */
/* { dg-final { scan-assembler-not "rep movsl" } } */
/* { dg-final { scan-assembler-not "rep movsb" } } */