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# commit 43b84013714c46e6dcae4a5564c5527777ad5e08
# Author: Alan Modra <amodra@gmail.com>
# Date: Sat Aug 17 18:45:31 2013 +0930
#
# PowerPC LE strcpy
# 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.
#
---
# sysdeps/powerpc/powerpc32/stpcpy.S | 18 +++++++++++++++++-
# sysdeps/powerpc/powerpc32/strcpy.S | 18 +++++++++++++++++-
# sysdeps/powerpc/powerpc64/stpcpy.S | 18 +++++++++++++++++-
# sysdeps/powerpc/powerpc64/strcpy.S | 27 +++++++++++++++++++++++++++
# 4 files changed, 78 insertions(+), 3 deletions(-)
#
--- a/sysdeps/powerpc/powerpc32/stpcpy.S
+++ b/sysdeps/powerpc/powerpc32/stpcpy.S
@@ -74,7 +74,22 @@
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
@@ -87,6 +102,7 @@
CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt)
STORE_RETURN_VALUE (rDEST)
blr
+#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4
--- a/sysdeps/powerpc/powerpc32/strcpy.S
+++ b/sysdeps/powerpc/powerpc32/strcpy.S
@@ -78,7 +78,22 @@
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
@@ -90,6 +105,7 @@
stb rALT, 7(rDEST)
/* GKM FIXME: check high bound. */
blr
+#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4
--- a/sysdeps/powerpc/powerpc64/stpcpy.S
+++ b/sysdeps/powerpc/powerpc64/stpcpy.S
@@ -75,7 +75,22 @@
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
@@ -88,6 +103,7 @@
CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt)
STORE_RETURN_VALUE (rDEST)
blr
+#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4
--- a/sysdeps/powerpc/powerpc64/strcpy.S
+++ b/sysdeps/powerpc/powerpc64/strcpy.S
@@ -90,6 +90,32 @@
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-
@@ -114,6 +140,7 @@
stb rALT, 15(rDEST)
/* GKM FIXME: check high bound. */
blr
+#endif
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4
|
