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| author | Alan Modra <amodra@gmail.com> | 2013-08-17 18:47:22 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2013-10-04 10:41:24 +0930 |
| commit | 759cfef3ac4c07dba1ece0bbc1207e099348816d (patch) | |
| tree | a0e8cadce4426afb90d39b330dd50688b8975484 /sysdeps/powerpc/powerpc64/memcpy.S | |
| parent | fe6e95d7171eba5f3e07848f081676fae4e86322 (diff) | |
| download | glibc-759cfef3ac4c07dba1ece0bbc1207e099348816d.tar.gz glibc-759cfef3ac4c07dba1ece0bbc1207e099348816d.tar.xz glibc-759cfef3ac4c07dba1ece0bbc1207e099348816d.zip | |
PowerPC LE memcpy
http://sourceware.org/ml/libc-alpha/2013-08/msg00103.html LIttle-endian support for memcpy. I spent some time cleaning up the 64-bit power7 memcpy, in order to avoid the extra alignment traps power7 takes for little-endian. It probably would have been better to copy the linux kernel version of memcpy. * sysdeps/powerpc/powerpc32/power4/memcpy.S: Add little endian support. * sysdeps/powerpc/powerpc32/power6/memcpy.S: Likewise. * sysdeps/powerpc/powerpc32/power7/memcpy.S: Likewise. * sysdeps/powerpc/powerpc32/power7/mempcpy.S: Likewise. * sysdeps/powerpc/powerpc64/memcpy.S: Likewise. * sysdeps/powerpc/powerpc64/power4/memcpy.S: Likewise. * sysdeps/powerpc/powerpc64/power6/memcpy.S: Likewise. * sysdeps/powerpc/powerpc64/power7/memcpy.S: Likewise. * sysdeps/powerpc/powerpc64/power7/mempcpy.S: Likewise. Make better use of regs. Use power7 mtocrf. Tidy function tails.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/memcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/memcpy.S | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/memcpy.S b/sysdeps/powerpc/powerpc64/memcpy.S index b8c4cc8b10..5fc7401c99 100644 --- a/sysdeps/powerpc/powerpc64/memcpy.S +++ b/sysdeps/powerpc/powerpc64/memcpy.S @@ -212,15 +212,28 @@ EALIGN (memcpy, 5, 0) blt cr6,5f srdi 7,6,16 bgt cr6,3f +#ifdef __LITTLE_ENDIAN__ + sth 7,0(3) +#else sth 6,0(3) +#endif b 7f .align 4 3: +#ifdef __LITTLE_ENDIAN__ + rotlwi 6,6,24 + stb 6,0(3) + sth 7,1(3) +#else stb 7,0(3) sth 6,1(3) +#endif b 7f .align 4 5: +#ifdef __LITTLE_ENDIAN__ + rotlwi 6,6,8 +#endif stb 6,0(3) 7: cmpldi cr1,10,16 @@ -328,7 +341,11 @@ EALIGN (memcpy, 5, 0) ld 7,8(5) subfic 9,10,64 beq 2f +#ifdef __LITTLE_ENDIAN__ + srd 0,6,10 +#else sld 0,6,10 +#endif cmpldi 11,1 mr 6,7 addi 4,4,-8 @@ -336,15 +353,25 @@ EALIGN (memcpy, 5, 0) b 1f 2: addi 5,5,8 .align 4 +#ifdef __LITTLE_ENDIAN__ +0: srd 0,6,10 + sld 8,7,9 +#else 0: sld 0,6,10 srd 8,7,9 +#endif cmpldi 11,2 ld 6,8(5) or 0,0,8 addi 11,11,-2 std 0,0(4) +#ifdef __LITTLE_ENDIAN__ + srd 0,7,10 +1: sld 8,6,9 +#else sld 0,7,10 1: srd 8,6,9 +#endif or 0,0,8 beq 8f ld 7,16(5) |