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s390/ebcdic: Use exrl instead of ex

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exrl is present in all machines currently supported, therefore prefer
it over ex. This saves one instruction and doesn't need an additional
register to hold the address of the target instruction.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Sven Schnelle
2025-01-08 15:27:04 +01:00
committed by Alexander Gordeev
parent 90c5515dcb
commit 94446b4dcb
1 changed files with 7 additions and 7 deletions
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14
arch/s390/include/asm/ebcdic.h
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@@ -25,15 +25,15 @@ codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
if (nr-- <= 0)
return;
asm volatile(
" bras 1,1f\n"
" tr 0(1,%0),0(%2)\n"
"0: tr 0(256,%0),0(%2)\n"
" j 2f\n"
"0: tr 0(1,%0),0(%2)\n"
"1: tr 0(256,%0),0(%2)\n"
" la %0,256(%0)\n"
"1: ahi %1,-256\n"
" jnm 0b\n"
" ex %1,0(1)"
"2: ahi %1,-256\n"
" jnm 1b\n"
" exrl %1,0b"
: "+&a" (addr), "+&a" (nr)
: "a" (codepage) : "cc", "memory", "1");
: "a" (codepage) : "cc", "memory");
}
#define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)