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target/openrisc: Optimize for r0 being zero

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The HW does not special-case r0, but the ABI specifies that r0 should
contain 0.  If we expose this fact to the optimizer, we can simplify
a lot of the generated code.  We must of course verify that r0==0, but
that is trivial to do with a TB flag.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-04-05 19:43:40 -07:00
parent a01deb36a6
commit 6597c28d61
3 changed files with 66 additions and 23 deletions
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1
target/openrisc/exception_helper.c
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@ -19,6 +19,7 @@
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exception.h"