From 807e39ed4da2cd7e6fe2c38a8d41d36f4c59e861 Mon Sep 17 00:00:00 2001 From: Sven Schnelle Date: Thu, 12 Dec 2024 10:55:03 +0100 Subject: [PATCH] s390/lib: Use exrl instead of ex in string functions 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 Signed-off-by: Sven Schnelle Signed-off-by: Alexander Gordeev --- arch/s390/lib/mem.S | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index 08f60a42b9a6e..d026debf250c7 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -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) -- 2.39.5