On Mon, 2013-05-13 at 17:09 +1000, Michael Neuling wrote: > > This doesn't work for me but the below does: ... > > stolen from GCC -02 output of: > unsigned long long __bswapdi2(unsigned long long x)
Hm, so was mine:
[dwmw2@i7 ~]$ powerpc64-linux-gnu-gcc -O2 -S -o- bswapdi2.c -m32
.file "bswapdi2.c"
.section ".text"
.align 2
.p2align 4,,15
.globl __bswapdi2
.type __bswapdi2, @function
__bswapdi2:
rlwinm 10,4,8,0xffffffff
rlwinm 11,3,8,0xffffffff
rlwimi 10,4,24,0,7
rlwimi 11,3,24,0,7
rlwimi 10,4,24,16,23
rlwimi 11,3,24,16,23
mr 4,11
mr 3,10
blr
.size __bswapdi2,.-__bswapdi2
.ident "GCC: (GNU) 4.7.2 20121105 (Red Hat 4.7.2-2.aa.20121114svn)"
On Mon, 2013-05-13 at 09:33 +0200, Gabriel Paubert wrote:
> Actually, I'd swap the two mr instructions to never
> have an instruction that uses the result from the
> previous one.
Bad GCC. No biscuit.
Should we file a PR?
--
David Woodhouse Open Source Technology Centre
david.woodho...@intel.com Intel Corporation
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