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s390/lib: Use exrl instead of ex in xor functions

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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 15:27:01 +01:00 • committed by Alexander Gordeev
parent 9988df07db
commit 745600ed69
1 changed files with 29 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

61
arch/s390/lib/xor.c
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@ -15,7 +15,6 @@ static void xor_xc_2(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p2)
{
asm volatile(
" larl 1,2f\n"
" aghi %0,-1\n"
" jm 3f\n"
" srlg 0,%0,8\n"
@ -25,12 +24,12 @@ static void xor_xc_2(unsigned long bytes, unsigned long * __restrict p1,
" la %1,256(%1)\n"
" la %2,256(%2)\n"
" brctg 0,0b\n"
"1: ex %0,0(1)\n"
"1: exrl %0,2f\n"
" j 3f\n"
"2: xc 0(1,%1),0(%2)\n"
"3:\n"
: : "d" (bytes), "a" (p1), "a" (p2)
: "0", "1", "cc", "memory");
: "0", "cc", "memory");
}
static void xor_xc_3(unsigned long bytes, unsigned long * __restrict p1,
@ -38,9 +37,8 @@ static void xor_xc_3(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p3)
{
asm volatile(
" larl 1,2f\n"
" aghi %0,-1\n"
" jm 3f\n"
" jm 4f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
@ -50,14 +48,14 @@ static void xor_xc_3(unsigned long bytes, unsigned long * __restrict p1,
" la %2,256(%2)\n"
" la %3,256(%3)\n"
" brctg 0,0b\n"
"1: ex %0,0(1)\n"
" ex %0,6(1)\n"
" j 3f\n"
"1: exrl %0,2f\n"
" exrl %0,3f\n"
" j 4f\n"
"2: xc 0(1,%1),0(%2)\n"
" xc 0(1,%1),0(%3)\n"
"3:\n"
"3: xc 0(1,%1),0(%3)\n"
"4:\n"
: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3)
: : "0", "1", "cc", "memory");
: : "0", "cc", "memory");
}
static void xor_xc_4(unsigned long bytes, unsigned long * __restrict p1,
@ -66,9 +64,8 @@ static void xor_xc_4(unsigned long bytes, unsigned long * __restrict p1,
const unsigned long * __restrict p4)
{
asm volatile(
" larl 1,2f\n"
" aghi %0,-1\n"
" jm 3f\n"
" jm 5f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
@ -80,16 +77,16 @@ static void xor_xc_4(unsigned long bytes, unsigned long * __restrict p1,
" la %3,256(%3)\n"
" la %4,256(%4)\n"
" brctg 0,0b\n"
"1: ex %0,0(1)\n"
" ex %0,6(1)\n"
" ex %0,12(1)\n"
" j 3f\n"
"1: exrl %0,2f\n"
" exrl %0,3f\n"
" exrl %0,4f\n"
" j 5f\n"
"2: xc 0(1,%1),0(%2)\n"
" xc 0(1,%1),0(%3)\n"
" xc 0(1,%1),0(%4)\n"
"3:\n"
"3: xc 0(1,%1),0(%3)\n"
"4: xc 0(1,%1),0(%4)\n"
"5:\n"
: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4)
: : "0", "1", "cc", "memory");
: : "0", "cc", "memory");
}
static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
@ -101,7 +98,7 @@ static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
asm volatile(
" larl 1,2f\n"
" aghi %0,-1\n"
" jm 3f\n"
" jm 6f\n"
" srlg 0,%0,8\n"
" ltgr 0,0\n"
" jz 1f\n"
@ -115,19 +112,19 @@ static void xor_xc_5(unsigned long bytes, unsigned long * __restrict p1,
" la %4,256(%4)\n"
" la %5,256(%5)\n"
" brctg 0,0b\n"
"1: ex %0,0(1)\n"
" ex %0,6(1)\n"
" ex %0,12(1)\n"
" ex %0,18(1)\n"
" j 3f\n"
"1: exrl %0,2f\n"
" exrl %0,3f\n"
" exrl %0,4f\n"
" exrl %0,5f\n"
" j 6f\n"
"2: xc 0(1,%1),0(%2)\n"
" xc 0(1,%1),0(%3)\n"
" xc 0(1,%1),0(%4)\n"
" xc 0(1,%1),0(%5)\n"
"3:\n"
"3: xc 0(1,%1),0(%3)\n"
"4: xc 0(1,%1),0(%4)\n"
"5: xc 0(1,%1),0(%5)\n"
"6:\n"
: "+d" (bytes), "+a" (p1), "+a" (p2), "+a" (p3), "+a" (p4),
"+a" (p5)
: : "0", "1", "cc", "memory");
: : "0", "cc", "memory");
}
struct xor_block_template xor_block_xc = {