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.

diff --git a/ChangeLog b/ChangeLog
index 540cb943168bc6a7ff83af9a698736dc4ecde606..bbe5836409737d0f5f359221184fa4f6075ecef9 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -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.

diff --git a/sysdeps/powerpc/powerpc32/stpcpy.S b/sysdeps/powerpc/powerpc32/stpcpy.S
index 03c6dddc3a65c851d1ba9426f788325184a3b50b..7e106e0e6c3a33c8c535266613e4fd3d232529e3 100644 (file)
--- a/sysdeps/powerpc/powerpc32/stpcpy.S
+++ b/sysdeps/powerpc/powerpc32/stpcpy.S
@@ -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

diff --git a/sysdeps/powerpc/powerpc32/strcpy.S b/sysdeps/powerpc/powerpc32/strcpy.S
index 4ae577dbb6d7cb36d736781f9bc379e007a97939..e938cc42a753f0ac5e7f091efe2421987e996654 100644 (file)
--- a/sysdeps/powerpc/powerpc32/strcpy.S
+++ b/sysdeps/powerpc/powerpc32/strcpy.S
@@ -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

diff --git a/sysdeps/powerpc/powerpc64/stpcpy.S b/sysdeps/powerpc/powerpc64/stpcpy.S
index 070cd4662f04b90c5b9f3e81f3db07e23e44d0f2..c0b39729e2c6c6543da8c9805f8f03b240d168eb 100644 (file)
--- a/sysdeps/powerpc/powerpc64/stpcpy.S
+++ b/sysdeps/powerpc/powerpc64/stpcpy.S
@@ -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

diff --git a/sysdeps/powerpc/powerpc64/strcpy.S b/sysdeps/powerpc/powerpc64/strcpy.S
index 4c6fd3f9d7f062e3b9f892c153cf075020db8c1d..a7fd85bad45681572ba5471b00ac3cfa590661b1 100644 (file)
--- a/sysdeps/powerpc/powerpc64/strcpy.S
+++ b/sysdeps/powerpc/powerpc64/strcpy.S
@@ -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