Re: [PATCH 0/2] tcg: optimize across branches

[Richard Henderson]

Ping.

On 10/13/20 3:23 PM, Richard Henderson wrote:
> In several cases, it's easy to optimize across a non-taken branch
> simply by *not* flushing the relevant tables.  This is true both
> for value propagation and register allocation.
> 
> This comes up in quite a number of cases with arm, most simply in
> how conditional execution is implemented.  But it also came up in
> discussion of how to implement low-overhead looping for v8.1m.
> 
> 
> r~
> 
> 
> Richard Henderson (2):
>   tcg: Do not kill globals at conditional branches
>   tcg/optimize: Flush data at labels not TCG_OPF_BB_END
> 
>  include/tcg/tcg-opc.h |  7 +++---
>  include/tcg/tcg.h     |  4 +++-
>  tcg/optimize.c        | 35 ++++++++++++++-------------
>  tcg/tcg.c             | 55 +++++++++++++++++++++++++++++++++++++++++--
>  4 files changed, 78 insertions(+), 23 deletions(-)
>