Re: [kvm-unit-tests PATCH] s390x: Use loop to save and restore fprs

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On 04/11/2019 09.55, Janosch Frank wrote:
Let's save some lines in the assembly by using a loop to save and
restore the fprs.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
---
  s390x/cstart64.S | 38 ++++++--------------------------------
  1 file changed, 6 insertions(+), 32 deletions(-)

diff --git a/s390x/cstart64.S b/s390x/cstart64.S
index 5dc1577..8e2b21e 100644
--- a/s390x/cstart64.S
+++ b/s390x/cstart64.S
@@ -99,44 +99,18 @@ memsetxc:
  	lctlg	%c0, %c0, 0(%r1)
  	/* save fprs 0-15 + fpc */
  	la	%r1, GEN_LC_SW_INT_FPRS
-	std	%f0, 0(%r1)
-	std	%f1, 8(%r1)
-	std	%f2, 16(%r1)
-	std	%f3, 24(%r1)
-	std	%f4, 32(%r1)
-	std	%f5, 40(%r1)
-	std	%f6, 48(%r1)
-	std	%f7, 56(%r1)
-	std	%f8, 64(%r1)
-	std	%f9, 72(%r1)
-	std	%f10, 80(%r1)
-	std	%f11, 88(%r1)
-	std	%f12, 96(%r1)
-	std	%f13, 104(%r1)
-	std	%f14, 112(%r1)
-	std	%f15, 120(%r1)
+	.irp i, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
+	std	\i, \i * 8(%r1)
+	.endr
  	stfpc	GEN_LC_SW_INT_FPC
  	.endm
.macro RESTORE_REGS
  	/* restore fprs 0-15 + fpc */
  	la	%r1, GEN_LC_SW_INT_FPRS
-	ld	%f0, 0(%r1)
-	ld	%f1, 8(%r1)
-	ld	%f2, 16(%r1)
-	ld	%f3, 24(%r1)
-	ld	%f4, 32(%r1)
-	ld	%f5, 40(%r1)
-	ld	%f6, 48(%r1)
-	ld	%f7, 56(%r1)
-	ld	%f8, 64(%r1)
-	ld	%f9, 72(%r1)
-	ld	%f10, 80(%r1)
-	ld	%f11, 88(%r1)
-	ld	%f12, 96(%r1)
-	ld	%f13, 104(%r1)
-	ld	%f14, 112(%r1)
-	ld	%f15, 120(%r1)
+	.irp i, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
+	ld	\i, \i * 8(%r1)
+	.endr
  	lfpc	GEN_LC_SW_INT_FPC
  	/* restore cr0 */
  	lctlg	%c0, %c0, GEN_LC_SW_INT_CR0


Produces exactly the same code as before.

Tested-by: Thomas Huth <thuth@xxxxxxxxxx>





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