search for: v3i8

...; >You can read about it here: >http://blog.llvm.org/2011/12/llvm-31-vector-changes.html > >> Hi, >> >> I am trying to understand how vector type legalization works. In >>particular, I'm looking at i8 vector types on x86 (with sse42 features) >> >> v3i8 gets widened to v4i8 and then operations get unrolled (scalarized) >>because v4i8 is not a legal type whereas v4i8 gets > >This does not sound right. v3i8 -> v4i8 is okay. But the next step >should be v4i8 -> v4i32. The operation nay be scalarized in the vector >legalizat...

Hi, I am trying to understand how vector type legalization works. In particular, I'm looking at i8 vector types on x86 (with sse42 features) v3i8 gets widened to v4i8 and then operations get unrolled (scalarized) because v4i8 is not a legal type whereas v4i8 gets promoted to v4i32. Why doesn't v3i8 (or even v4i8) get widened to v16i8? Alternatively, v3i8 could be widened to v4i8 then promoted to v4i32 but this doesn't happen either....

Hi Paul, You can read about it here: http://blog.llvm.org/2011/12/llvm-31-vector-changes.html > Hi, > > I am trying to understand how vector type legalization works. In particular, I'm looking at i8 vector types on x86 (with sse42 features) > > v3i8 gets widened to v4i8 and then operations get unrolled (scalarized) because v4i8 is not a legal type whereas v4i8 gets This does not sound right. v3i8 -> v4i8 is okay. But the next step should be v4i8 -> v4i32. The operation nay be scalarized in the vector legalization phase. > promo...

...gt;> http://blog.llvm.org/2011/12/llvm-31-vector-changes.html >> >>> Hi, >>> >>> I am trying to understand how vector type legalization works. In >>> particular, I'm looking at i8 vector types on x86 (with sse42 features) >>> >>> v3i8 gets widened to v4i8 and then operations get unrolled (scalarized) >>> because v4i8 is not a legal type whereas v4i8 gets >> >> This does not sound right. v3i8 -> v4i8 is okay. But the next step >> should be v4i8 -> v4i32. The operation nay be scalarized in the...

...apple.com<mailto:nrotem at apple.com>> wrote: Hi Paul, You can read about it here: http://blog.llvm.org/2011/12/llvm-31-vector-changes.html Hi, I am trying to understand how vector type legalization works. In particular, I'm looking at i8 vector types on x86 (with sse42 features) v3i8 gets widened to v4i8 and then operations get unrolled (scalarized) because v4i8 is not a legal type whereas v4i8 gets This does not sound right. v3i8 -> v4i8 is okay. But the next step should be v4i8 -> v4i32. The operation nay be scalarized in the vector legalization phase. What I'm...

...quot;Nadav Rotem" <nrotem at apple.com> wrote: Hi Paul, You can read about it here: http://blog.llvm.org/2011/12/llvm-31-vector-changes.html Hi, I am trying to understand how vector type legalization works. In particular, I'm looking at i8 vector types on x86 (with sse42 features) v3i8 gets widened to v4i8 and then operations get unrolled (scalarized) because v4i8 is not a legal type whereas v4i8 gets This does not sound right. v3i8 -> v4i8 is okay. But the next step should be v4i8 -> v4i32. The operation nay be scalarized in the vector legalization phase. What I'm...