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* [PATCH] [s390]: Use .rept directive to store/load fpu registers
@ 2015-08-28 13:49 Alexander Kuleshov
  2015-09-01  7:51 ` Christian Borntraeger
  0 siblings, 1 reply; 3+ messages in thread
From: Alexander Kuleshov @ 2015-08-28 13:49 UTC (permalink / raw)
  To: Martin Schwidefsky, Heiko Carstens
  Cc: linux390, linux-s390, linux-kernel, Alexander Kuleshov

We can use .rept directive to simplify/decrease assembly code
that makes storing and loading floating point registers in the
arch/s390/kernel/swsusp.S.

The resulting code after the patch is the same that before

 2c4:	68 00 d2 00       	ld	%f0,512(%r13)
 2c8:	68 10 d2 08       	ld	%f1,520(%r13)
 2cc:	68 20 d2 10       	ld	%f2,528(%r13)
 2d0:	68 30 d2 18       	ld	%f3,536(%r13)
 2d4:	68 40 d2 20       	ld	%f4,544(%r13)
 2d8:	68 50 d2 28       	ld	%f5,552(%r13)
 2dc:	68 60 d2 30       	ld	%f6,560(%r13)
 2e0:	68 70 d2 38       	ld	%f7,568(%r13)
 2e4:	68 80 d2 40       	ld	%f8,576(%r13)
 2e8:	68 90 d2 48       	ld	%f9,584(%r13)
 2ec:	68 a0 d2 50       	ld	%f10,592(%r13)
 2f0:	68 b0 d2 58       	ld	%f11,600(%r13)
 2f4:	68 c0 d2 60       	ld	%f12,608(%r13)
 2f8:	68 d0 d2 68       	ld	%f13,616(%r13)
 2fc:	68 e0 d2 70       	ld	%f14,624(%r13)
 300:	68 f0 d2 78       	ld	%f15,632(%r13)

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
---
 arch/s390/kernel/swsusp.S | 49 ++++++++++++++++-------------------------------
 1 file changed, 17 insertions(+), 32 deletions(-)

diff --git a/arch/s390/kernel/swsusp.S b/arch/s390/kernel/swsusp.S
index ca62946..8011e14 100644
--- a/arch/s390/kernel/swsusp.S
+++ b/arch/s390/kernel/swsusp.S
@@ -48,22 +48,15 @@ ENTRY(swsusp_arch_suspend)
 	/* Store registers */
 	mvc	0x318(4,%r1),__SF_EMPTY(%r15)	/* move prefix to lowcore */
 	stfpc	0x31c(%r1)			/* store fpu control */
-	std	0,0x200(%r1)			/* store f0 */
-	std	1,0x208(%r1)			/* store f1 */
-	std	2,0x210(%r1)			/* store f2 */
-	std	3,0x218(%r1)			/* store f3 */
-	std	4,0x220(%r1)			/* store f4 */
-	std	5,0x228(%r1)			/* store f5 */
-	std	6,0x230(%r1)			/* store f6 */
-	std	7,0x238(%r1)			/* store f7 */
-	std	8,0x240(%r1)			/* store f8 */
-	std	9,0x248(%r1)			/* store f9 */
-	std	10,0x250(%r1)			/* store f10 */
-	std	11,0x258(%r1)			/* store f11 */
-	std	12,0x260(%r1)			/* store f12 */
-	std	13,0x268(%r1)			/* store f13 */
-	std	14,0x270(%r1)			/* store f14 */
-	std	15,0x278(%r1)			/* store f15 */
+
+	/* store f0..f15 floating point registers */
+	.set i, 0
+	.set f, 0x200
+	.rept 16
+	std i, f(%r1)
+	.set i, (i+1)
+	.set f, (f+0x8)
+	.endr
 	stam	%a0,%a15,0x340(%r1)		/* store access registers */
 	stctg	%c0,%c15,0x380(%r1)		/* store control registers */
 	stmg	%r0,%r15,0x280(%r1)		/* store general registers */
@@ -250,22 +243,14 @@ restore_registers:
 	lam	%a0,%a15,0x340(%r13)	/* load access registers */
 
 	lfpc	0x31c(%r13)		/* load fpu control */
-	ld	0,0x200(%r13)		/* load f0 */
-	ld	1,0x208(%r13)		/* load f1 */
-	ld	2,0x210(%r13)		/* load f2 */
-	ld	3,0x218(%r13)		/* load f3 */
-	ld	4,0x220(%r13)		/* load f4 */
-	ld	5,0x228(%r13)		/* load f5 */
-	ld	6,0x230(%r13)		/* load f6 */
-	ld	7,0x238(%r13)		/* load f7 */
-	ld	8,0x240(%r13)		/* load f8 */
-	ld	9,0x248(%r13)		/* load f9 */
-	ld	10,0x250(%r13)		/* load f10 */
-	ld	11,0x258(%r13)		/* load f11 */
-	ld	12,0x260(%r13)		/* load f12 */
-	ld	13,0x268(%r13)		/* load f13 */
-	ld	14,0x270(%r13)		/* load f14 */
-	ld	15,0x278(%r13)		/* load f15 */
+	/* load f0...f15 floating point registers */
+	.set i, 0
+	.set f, 0x200
+	.rept 16
+	ld i, f(%r13)
+	.set i, (i+1)
+	.set f, (f+0x8)
+	.endr
 
 	/* Load old stack */
 	lg	%r15,0x2f8(%r13)
-- 
2.5.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH] [s390]: Use .rept directive to store/load fpu registers
  2015-08-28 13:49 [PATCH] [s390]: Use .rept directive to store/load fpu registers Alexander Kuleshov
@ 2015-09-01  7:51 ` Christian Borntraeger
  2015-09-07 14:13   ` Heiko Carstens
  0 siblings, 1 reply; 3+ messages in thread
From: Christian Borntraeger @ 2015-09-01  7:51 UTC (permalink / raw)
  To: Alexander Kuleshov, Martin Schwidefsky, Heiko Carstens
  Cc: linux390, linux-s390, linux-kernel

Am 28.08.2015 um 15:49 schrieb Alexander Kuleshov:
> We can use .rept directive to simplify/decrease assembly code
> that makes storing and loading floating point registers in the
> arch/s390/kernel/swsusp.S.
> 
> The resulting code after the patch is the same that before
> 
>  2c4:	68 00 d2 00       	ld	%f0,512(%r13)
>  2c8:	68 10 d2 08       	ld	%f1,520(%r13)
>  2cc:	68 20 d2 10       	ld	%f2,528(%r13)
>  2d0:	68 30 d2 18       	ld	%f3,536(%r13)
>  2d4:	68 40 d2 20       	ld	%f4,544(%r13)
>  2d8:	68 50 d2 28       	ld	%f5,552(%r13)
>  2dc:	68 60 d2 30       	ld	%f6,560(%r13)
>  2e0:	68 70 d2 38       	ld	%f7,568(%r13)
>  2e4:	68 80 d2 40       	ld	%f8,576(%r13)
>  2e8:	68 90 d2 48       	ld	%f9,584(%r13)
>  2ec:	68 a0 d2 50       	ld	%f10,592(%r13)
>  2f0:	68 b0 d2 58       	ld	%f11,600(%r13)
>  2f4:	68 c0 d2 60       	ld	%f12,608(%r13)
>  2f8:	68 d0 d2 68       	ld	%f13,616(%r13)
>  2fc:	68 e0 d2 70       	ld	%f14,624(%r13)
>  300:	68 f0 d2 78       	ld	%f15,632(%r13)
> 
> Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
> ---
>  arch/s390/kernel/swsusp.S | 49 ++++++++++++++++-------------------------------
>  1 file changed, 17 insertions(+), 32 deletions(-)
> 
> diff --git a/arch/s390/kernel/swsusp.S b/arch/s390/kernel/swsusp.S
> index ca62946..8011e14 100644
> --- a/arch/s390/kernel/swsusp.S
> +++ b/arch/s390/kernel/swsusp.S
> @@ -48,22 +48,15 @@ ENTRY(swsusp_arch_suspend)
>  	/* Store registers */
>  	mvc	0x318(4,%r1),__SF_EMPTY(%r15)	/* move prefix to lowcore */
>  	stfpc	0x31c(%r1)			/* store fpu control */
> -	std	0,0x200(%r1)			/* store f0 */
> -	std	1,0x208(%r1)			/* store f1 */
> -	std	2,0x210(%r1)			/* store f2 */
> -	std	3,0x218(%r1)			/* store f3 */
> -	std	4,0x220(%r1)			/* store f4 */
> -	std	5,0x228(%r1)			/* store f5 */
> -	std	6,0x230(%r1)			/* store f6 */
> -	std	7,0x238(%r1)			/* store f7 */
> -	std	8,0x240(%r1)			/* store f8 */
> -	std	9,0x248(%r1)			/* store f9 */
> -	std	10,0x250(%r1)			/* store f10 */
> -	std	11,0x258(%r1)			/* store f11 */
> -	std	12,0x260(%r1)			/* store f12 */
> -	std	13,0x268(%r1)			/* store f13 */
> -	std	14,0x270(%r1)			/* store f14 */
> -	std	15,0x278(%r1)			/* store f15 */
> +
> +	/* store f0..f15 floating point registers */
> +	.set i, 0
> +	.set f, 0x200
> +	.rept 16
> +	std i, f(%r1)
> +	.set i, (i+1)
> +	.set f, (f+0x8)
> +	.endr

I personally find the existing code easier to read, especially as it matches the
assembler output and I can directly where the slots are, (e.g. f11 is 0x258)


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH] [s390]: Use .rept directive to store/load fpu registers
  2015-09-01  7:51 ` Christian Borntraeger
@ 2015-09-07 14:13   ` Heiko Carstens
  0 siblings, 0 replies; 3+ messages in thread
From: Heiko Carstens @ 2015-09-07 14:13 UTC (permalink / raw)
  To: Christian Borntraeger
  Cc: Alexander Kuleshov, Martin Schwidefsky, linux390, linux-s390,
	linux-kernel

On Tue, Sep 01, 2015 at 09:51:32AM +0200, Christian Borntraeger wrote:
> Am 28.08.2015 um 15:49 schrieb Alexander Kuleshov:
> >  arch/s390/kernel/swsusp.S | 49 ++++++++++++++++-------------------------------
> >  1 file changed, 17 insertions(+), 32 deletions(-)
> > 
> > diff --git a/arch/s390/kernel/swsusp.S b/arch/s390/kernel/swsusp.S
> > index ca62946..8011e14 100644
> > --- a/arch/s390/kernel/swsusp.S
> > +++ b/arch/s390/kernel/swsusp.S
> > @@ -48,22 +48,15 @@ ENTRY(swsusp_arch_suspend)
> >  	/* Store registers */
> >  	mvc	0x318(4,%r1),__SF_EMPTY(%r15)	/* move prefix to lowcore */
> >  	stfpc	0x31c(%r1)			/* store fpu control */
> > -	std	0,0x200(%r1)			/* store f0 */
> > -	std	1,0x208(%r1)			/* store f1 */
> > -	std	2,0x210(%r1)			/* store f2 */
> > -	std	3,0x218(%r1)			/* store f3 */
> > -	std	4,0x220(%r1)			/* store f4 */
> > -	std	5,0x228(%r1)			/* store f5 */
> > -	std	6,0x230(%r1)			/* store f6 */
> > -	std	7,0x238(%r1)			/* store f7 */
> > -	std	8,0x240(%r1)			/* store f8 */
> > -	std	9,0x248(%r1)			/* store f9 */
> > -	std	10,0x250(%r1)			/* store f10 */
> > -	std	11,0x258(%r1)			/* store f11 */
> > -	std	12,0x260(%r1)			/* store f12 */
> > -	std	13,0x268(%r1)			/* store f13 */
> > -	std	14,0x270(%r1)			/* store f14 */
> > -	std	15,0x278(%r1)			/* store f15 */
> > +
> > +	/* store f0..f15 floating point registers */
> > +	.set i, 0
> > +	.set f, 0x200
> > +	.rept 16
> > +	std i, f(%r1)
> > +	.set i, (i+1)
> > +	.set f, (f+0x8)
> > +	.endr
> 
> I personally find the existing code easier to read, especially as it matches the
> assembler output and I can directly where the slots are, (e.g. f11 is 0x258)

Yes, I agree with Christian. Let's keep the code as it is.


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2015-09-07 14:14 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2015-08-28 13:49 [PATCH] [s390]: Use .rept directive to store/load fpu registers Alexander Kuleshov
2015-09-01  7:51 ` Christian Borntraeger
2015-09-07 14:13   ` Heiko Carstens

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