Re: [PATCH] x86_64: Some SUBREG related optimization tweaks to i386 backend.

2021-10-11 Thread Hongtao Liu via Gcc-patches
On Mon, Oct 11, 2021 at 4:55 PM Roger Sayle wrote: > > > This patch contains two SUBREG-related optimization enabling tweaks to > the x86 backend. > > The first change, to ix86_expand_vector_extract, cures the strange > -march=cascadelake related non-determinism that affected my new test > cases l

[PATCH] x86_64: Some SUBREG related optimization tweaks to i386 backend.

2021-10-11 Thread Roger Sayle
This patch contains two SUBREG-related optimization enabling tweaks to the x86 backend. The first change, to ix86_expand_vector_extract, cures the strange -march=cascadelake related non-determinism that affected my new test cases last week. Extracting a QImode or HImode element from an SSE vecto