[kvm-unit-tests,PULL,01/12] s390x: Use loop to save and restore fprs
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Message ID 20191118100719.7968-2-david@redhat.com
State New
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Series
  • [kvm-unit-tests,PULL,01/12] s390x: Use loop to save and restore fprs
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Commit Message

David Hildenbrand Nov. 18, 2019, 10:07 a.m. UTC
From: Janosch Frank <frankja@linux.ibm.com>

Let's save some lines in the assembly by using a loop to save and
restore the fprs.

Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20191104085533.2892-1-frankja@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 s390x/cstart64.S | 38 ++++++--------------------------------
 1 file changed, 6 insertions(+), 32 deletions(-)

Patch
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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