diff options
author | Helge Deller <deller@gmx.de> | 2019-02-06 23:21:10 +0100 |
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committer | Helge Deller <deller@gmx.de> | 2019-08-03 08:56:57 +0200 |
commit | 83af58f8068ea3f7b3c537c37a30887bfa585069 (patch) | |
tree | ce1b09ba9adda2675dd7486bc53e4a2fb79f6853 /arch/parisc/lib/string.S | |
parent | ec4d396b635070e0caf5888d58cb9eedc8dd73d9 (diff) |
parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat
Add performance-optimized versions of some string functions.
Signed-off-by: Helge Deller <deller@gmx.de>
Tested-by: Sven Schnelle <svens@stackframe.org>
Diffstat (limited to 'arch/parisc/lib/string.S')
-rw-r--r-- | arch/parisc/lib/string.S | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/arch/parisc/lib/string.S b/arch/parisc/lib/string.S new file mode 100644 index 000000000000..4a64264427a6 --- /dev/null +++ b/arch/parisc/lib/string.S @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PA-RISC assembly string functions + * + * Copyright (C) 2019 Helge Deller <deller@gmx.de> + */ + +#include <asm/assembly.h> +#include <linux/linkage.h> + + .section .text.hot + .level PA_ASM_LEVEL + + t0 = r20 + t1 = r21 + t2 = r22 + +ENTRY_CFI(strlen, frame=0,no_calls) + or,COND(<>) arg0,r0,ret0 + b,l,n .Lstrlen_null_ptr,r0 + depwi 0,31,2,ret0 + cmpb,COND(<>) arg0,ret0,.Lstrlen_not_aligned + ldw,ma 4(ret0),t0 + cmpib,tr 0,r0,.Lstrlen_loop + uxor,nbz r0,t0,r0 +.Lstrlen_not_aligned: + uaddcm arg0,ret0,t1 + shladd t1,3,r0,t1 + mtsar t1 + depwi -1,%sar,32,t0 + uxor,nbz r0,t0,r0 +.Lstrlen_loop: + b,l,n .Lstrlen_end_loop,r0 + ldw,ma 4(ret0),t0 + cmpib,tr 0,r0,.Lstrlen_loop + uxor,nbz r0,t0,r0 +.Lstrlen_end_loop: + extrw,u,<> t0,7,8,r0 + addib,tr,n -3,ret0,.Lstrlen_out + extrw,u,<> t0,15,8,r0 + addib,tr,n -2,ret0,.Lstrlen_out + extrw,u,<> t0,23,8,r0 + addi -1,ret0,ret0 +.Lstrlen_out: + bv r0(rp) + uaddcm ret0,arg0,ret0 +.Lstrlen_null_ptr: + bv,n r0(rp) +ENDPROC_CFI(strlen) + + +ENTRY_CFI(strcpy, frame=0,no_calls) + ldb 0(arg1),t0 + stb t0,0(arg0) + ldo 0(arg0),ret0 + ldo 1(arg1),t1 + cmpb,= r0,t0,2f + ldo 1(arg0),t2 +1: ldb 0(t1),arg1 + stb arg1,0(t2) + ldo 1(t1),t1 + cmpb,<> r0,arg1,1b + ldo 1(t2),t2 +2: bv,n r0(rp) +ENDPROC_CFI(strcpy) + + +ENTRY_CFI(strncpy, frame=0,no_calls) + ldb 0(arg1),t0 + stb t0,0(arg0) + ldo 1(arg1),t1 + ldo 0(arg0),ret0 + cmpb,= r0,t0,2f + ldo 1(arg0),arg1 +1: ldo -1(arg2),arg2 + cmpb,COND(=),n r0,arg2,2f + ldb 0(t1),arg0 + stb arg0,0(arg1) + ldo 1(t1),t1 + cmpb,<> r0,arg0,1b + ldo 1(arg1),arg1 +2: bv,n r0(rp) +ENDPROC_CFI(strncpy) + + +ENTRY_CFI(strcat, frame=0,no_calls) + ldb 0(arg0),t0 + cmpb,= t0,r0,2f + ldo 0(arg0),ret0 + ldo 1(arg0),arg0 +1: ldb 0(arg0),t1 + cmpb,<>,n r0,t1,1b + ldo 1(arg0),arg0 +2: ldb 0(arg1),t2 + stb t2,0(arg0) + ldo 1(arg0),arg0 + ldb 0(arg1),t0 + cmpb,<> r0,t0,2b + ldo 1(arg1),arg1 + bv,n r0(rp) +ENDPROC_CFI(strcat) + + +ENTRY_CFI(memset, frame=0,no_calls) + copy arg0,ret0 + cmpb,COND(=) r0,arg0,4f + copy arg0,t2 + cmpb,COND(=) r0,arg2,4f + ldo -1(arg2),arg3 + subi -1,arg3,t0 + subi 0,t0,t1 + cmpiclr,COND(>=) 0,t1,arg2 + ldo -1(t1),arg2 + extru arg2,31,2,arg0 +2: stb arg1,0(t2) + ldo 1(t2),t2 + addib,>= -1,arg0,2b + ldo -1(arg3),arg3 + cmpiclr,COND(<=) 4,arg2,r0 + b,l,n 4f,r0 +#ifdef CONFIG_64BIT + depd,* r0,63,2,arg2 +#else + depw r0,31,2,arg2 +#endif + ldo 1(t2),t2 +3: stb arg1,-1(t2) + stb arg1,0(t2) + stb arg1,1(t2) + stb arg1,2(t2) + addib,COND(>) -4,arg2,3b + ldo 4(t2),t2 +4: bv,n r0(rp) +ENDPROC_CFI(memset) + + .end |