Re: [to-be-committed][RISC-V] Avoid unnecessary extensions after sCC insns

2024-09-04 Thread Jeff Law
On 9/4/24 4:11 PM, Palmer Dabbelt wrote: On Wed, 04 Sep 2024 13:47:58 PDT (-0700), jeffreya...@gmail.com wrote: So I was looking at a performance regression in spec with Ventana's internal tree. Ultimately the problem was a bad interaction with an internal patch (REP_MODE_EXTENDED), fwprop

Re: [to-be-committed][RISC-V] Avoid unnecessary extensions after sCC insns

2024-09-04 Thread Palmer Dabbelt
On Wed, 04 Sep 2024 13:47:58 PDT (-0700), jeffreya...@gmail.com wrote: > > So I was looking at a performance regression in spec with Ventana's > internal tree. Ultimately the problem was a bad interaction with an > internal patch (REP_MODE_EXTENDED), fwprop and ext-dce. The details of > that prob

[to-be-committed][RISC-V] Avoid unnecessary extensions after sCC insns

2024-09-04 Thread Jeff Law
So I was looking at a performance regression in spec with Ventana's internal tree. Ultimately the problem was a bad interaction with an internal patch (REP_MODE_EXTENDED), fwprop and ext-dce. The details of that problem aren't particularly important. Removal of the local patch went reason