[PATCH] powerpc: Fix VSX register number on __strncpy_power9 [BZ #29197]

[Matheus Castanho]

__strncpy_power9 initializes VR 18 with zeroes to be used throughout the
code, including when zero-padding the destination string. However, the
v18 reference was mistakenly being used for stxv and stxvl, which take a
VSX vector as operand. The code ended up using the uninitialized VSR 18
register by mistake.

Both occurrences have been changed to use the proper VSX number for VR 18
(i.e. VSR 50).

Tested on powerpc, powerpc64 and powerpc64le.

Suggested-by: Kewen Lin <linkw@gcc.gnu.org>
---
 sysdeps/powerpc/powerpc64/le/power9/strncpy.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
index ae23161316..deb94671cc 100644
--- a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
+++ b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
@@ -352,7 +352,7 @@ L(zero_padding_loop):
 	cmpldi	cr6,r5,16	/* Check if length was reached.  */
 	ble	cr6,L(zero_padding_end)
 
-	stxv	v18,0(r11)
+	stxv	32+v18,0(r11)
 	addi	r11,r11,16
 	addi	r5,r5,-16
 
@@ -360,7 +360,7 @@ L(zero_padding_loop):
 
 L(zero_padding_end):
 	sldi	r10,r5,56	/* stxvl wants size in top 8 bits  */
-	stxvl	v18,r11,r10	/* Partial store  */
+	stxvl	32+v18,r11,r10	/* Partial store  */
 	blr
 
 	.align	4
-- 
2.35.3