On Mon, Sep 26, 2022 at 11:51:44AM +0100, Peter Krefting wrote: > The DCBZL instruction is not available for the e500v1 and e500v2 > architectures, but may still be recognized by the toolchain, so we need to > remove the test for it explicitly for these architectures. > > References: PowerPC™ e500 Core Family Reference Manual (Freescale) > > Found-by: Ståle Kristoffersen <staal...@ifi.uio.no> > Compare: Commit d5733936d857ce5c7d28c0bc9e89a2e2548f8895 > --- > configure | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > This was originally fixed by commit d5733936d857ce5c7d28c0bc9e89a2e2548f8895 > in version 2.2, but later broke in a merge which introduced a "disable dcbzl", > forgot to check for it in the ppc branch. > > diff --git a/configure b/configure > index 7a62f0c248..5d01833f40 100755 > --- a/configure > +++ b/configure > @@ -6058,7 +6058,9 @@ elif enabled ppc; then > > enable local_aligned > > - check_inline_asm dcbzl '"dcbzl 0, %0" :: "r"(0)' > + if enabled dcbzl; then > + check_inline_asm dcbzl '"dcbzl 0, %0" :: "r"(0)' > + fi
something like this
disabled dcbzl || check_inline_asm dcbzl '"dcbzl 0, %0" :: "r"(0)'
seems more clear
what this is supposed to do is to disable the instruction when it was
explicitly disabled for the target CPU
thx
{...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Awnsering whenever a program halts or runs forever is
On a turing machine, in general impossible (turings halting problem).
On any real computer, always possible as a real computer has a finite number
of states N, and will either halt in less than N cycles or never halt.
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