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PowerPC LE strcpy

Browse Source 
http://sourceware.org/ml/libc-alpha/2013-08/msg00100.html

The strcpy changes for little-endian are quite straight-forward, just
a matter of rotating the last word differently.

I'll note that the powerpc64 version of stpcpy is just begging to be
converted to use 64-bit loads and stores..

	* sysdeps/powerpc/powerpc64/strcpy.S: Add little-endian support:
	* sysdeps/powerpc/powerpc32/strcpy.S: Likewise.
	* sysdeps/powerpc/powerpc64/stpcpy.S: Likewise.
	* sysdeps/powerpc/powerpc32/stpcpy.S: Likewise.
This commit is contained in:
Alan Modra 2013-08-17 18:45:31 +09:30
parent 8a7413f9b0
commit 43b8401371
5 changed files with 85 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ChangeLog
View File

@ -1,3 +1,10 @@
2013-10-04 Alan Modra <amodra@gmail.com>
* sysdeps/powerpc/powerpc64/strcpy.S: Add little-endian support:
* sysdeps/powerpc/powerpc32/strcpy.S: Likewise.
* sysdeps/powerpc/powerpc64/stpcpy.S: Likewise.
* sysdeps/powerpc/powerpc32/stpcpy.S: Likewise.
2013-10-04 Alan Modra <amodra@gmail.com>
* sysdeps/powerpc/powerpc64/strcmp.S (rTMP2): Define as r0.

18
sysdeps/powerpc/powerpc32/stpcpy.S
View File

@ -62,7 +62,22 @@ L(g2): add rTMP, rFEFE, rWORD
mr rALT, rWORD
/* We've hit the end of the string. Do the rest byte-by-byte. */
L(g1): rlwinm. rTMP, rALT, 8, 24, 31
L(g1):
#ifdef __LITTLE_ENDIAN__
rlwinm. rTMP, rALT, 0, 24, 31
stbu rALT, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 24, 24, 31
stbu rTMP, 1(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
stbu rTMP, 1(rDEST)
beqlr-
rlwinm rTMP, rALT, 8, 24, 31
stbu rTMP, 1(rDEST)
blr
#else
rlwinm. rTMP, rALT, 8, 24, 31
stbu rTMP, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
@ -73,6 +88,7 @@ L(g1): rlwinm. rTMP, rALT, 8, 24, 31
beqlr-
stbu rALT, 1(rDEST)
blr
#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4

18
sysdeps/powerpc/powerpc32/strcpy.S
View File

@ -62,7 +62,22 @@ L(g2): add rTMP, rFEFE, rWORD
mr rALT, rWORD
/* We've hit the end of the string. Do the rest byte-by-byte. */
L(g1): rlwinm. rTMP, rALT, 8, 24, 31
L(g1):
#ifdef __LITTLE_ENDIAN__
rlwinm. rTMP, rALT, 0, 24, 31
stb rALT, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 24, 24, 31
stb rTMP, 5(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
stb rTMP, 6(rDEST)
beqlr-
rlwinm rTMP, rALT, 8, 24, 31
stb rTMP, 7(rDEST)
blr
#else
rlwinm. rTMP, rALT, 8, 24, 31
stb rTMP, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
@ -73,6 +88,7 @@ L(g1): rlwinm. rTMP, rALT, 8, 24, 31
beqlr-
stb rALT, 7(rDEST)
blr
#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4

18
sysdeps/powerpc/powerpc64/stpcpy.S
View File

@ -62,7 +62,22 @@ L(g2): add rTMP, rFEFE, rWORD
mr rALT, rWORD
/* We've hit the end of the string. Do the rest byte-by-byte. */
L(g1): rlwinm. rTMP, rALT, 8, 24, 31
L(g1):
#ifdef __LITTLE_ENDIAN__
rlwinm. rTMP, rALT, 0, 24, 31
stbu rALT, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 24, 24, 31
stbu rTMP, 1(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
stbu rTMP, 1(rDEST)
beqlr-
rlwinm rTMP, rALT, 8, 24, 31
stbu rTMP, 1(rDEST)
blr
#else
rlwinm. rTMP, rALT, 8, 24, 31
stbu rTMP, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
@ -73,6 +88,7 @@ L(g1): rlwinm. rTMP, rALT, 8, 24, 31
beqlr-
stbu rALT, 1(rDEST)
blr
#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4

27
sysdeps/powerpc/powerpc64/strcpy.S
View File

@ -68,6 +68,32 @@ L(g2): add rTMP, rFEFE, rWORD
mr rALT, rWORD
/* We've hit the end of the string. Do the rest byte-by-byte. */
L(g1):
#ifdef __LITTLE_ENDIAN__
extrdi. rTMP, rALT, 8, 56
stb rALT, 8(rDEST)
beqlr-
extrdi. rTMP, rALT, 8, 48
stb rTMP, 9(rDEST)
beqlr-
extrdi. rTMP, rALT, 8, 40
stb rTMP, 10(rDEST)
beqlr-
extrdi. rTMP, rALT, 8, 32
stb rTMP, 11(rDEST)
beqlr-
extrdi. rTMP, rALT, 8, 24
stb rTMP, 12(rDEST)
beqlr-
extrdi. rTMP, rALT, 8, 16
stb rTMP, 13(rDEST)
beqlr-
extrdi. rTMP, rALT, 8, 8
stb rTMP, 14(rDEST)
beqlr-
extrdi rTMP, rALT, 8, 0
stb rTMP, 15(rDEST)
blr
#else
extrdi. rTMP, rALT, 8, 0
stb rTMP, 8(rDEST)
beqlr-
@ -91,6 +117,7 @@ L(g1):
beqlr-
stb rALT, 15(rDEST)
blr
#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4