On 8/30/21 3:00 PM, Philippe Mathieu-Daudé wrote:
Hi Richard,
On 8/30/21 8:24 AM, Richard Henderson wrote:
Currently, we have support for optimizing redundant zero extensions,
which I think was done with x86 and aarch64 in mind, which zero-extend
all 32-bit operations into the 64-bit register.
But targets like Alpha, MIPS, and RISC-V do sign-extensions instead.
The last 5 patches address this.
But before that, split the quite massive tcg_optimize function.
Looks promising after quick review. Do you have any comparison perf numbers?
No, not yet. I expect there to be *lots* of redundant extensions with the patches for
RV32 on RV64. I think only MIPS n32 would compare, and I don't have a chroot for that,
only n64.
r~
