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

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

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-12-12 10:55:03 +01:00 committed by Alexander Gordeev
parent f8107a8be0
commit 807e39ed4d
1 changed files with 5 additions and 10 deletions
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15
arch/s390/lib/mem.S
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@ -34,8 +34,7 @@ SYM_FUNC_START(__memmove)
la %r3,256(%r3)
brctg %r0,.Lmemmove_forward_loop
.Lmemmove_forward_remainder:
larl %r5,.Lmemmove_mvc
ex %r4,0(%r5)
exrl %r4,.Lmemmove_mvc
.Lmemmove_exit:
BR_EX %r14
.Lmemmove_reverse:
@ -83,8 +82,7 @@ SYM_FUNC_START(__memset)
la %r1,256(%r1)
brctg %r3,.Lmemset_clear_loop
.Lmemset_clear_remainder:
larl %r3,.Lmemset_xc
ex %r4,0(%r3)
exrl %r4,.Lmemset_xc
.Lmemset_exit:
BR_EX %r14
.Lmemset_fill:
@ -102,8 +100,7 @@ SYM_FUNC_START(__memset)
brctg %r5,.Lmemset_fill_loop
.Lmemset_fill_remainder:
stc %r3,0(%r1)
larl %r5,.Lmemset_mvc
ex %r4,0(%r5)
exrl %r4,.Lmemset_mvc
BR_EX %r14
.Lmemset_fill_exit:
stc %r3,0(%r1)
@ -132,8 +129,7 @@ SYM_FUNC_START(__memcpy)
lgr %r1,%r2
jnz .Lmemcpy_loop
.Lmemcpy_remainder:
larl %r5,.Lmemcpy_mvc
ex %r4,0(%r5)
exrl %r4,.Lmemcpy_mvc
.Lmemcpy_exit:
BR_EX %r14
.Lmemcpy_loop:
@ -175,8 +171,7 @@ SYM_FUNC_START(__memset\bits)
brctg %r5,.L__memset_loop\bits
.L__memset_remainder\bits:
\insn %r3,0(%r1)
larl %r5,.L__memset_mvc\bits
ex %r4,0(%r5)
exrl %r4,.L__memset_mvc\bits
BR_EX %r14
.L__memset_store\bits:
\insn %r3,0(%r2)