https://bugs.llvm.org/show_bug.cgi?id=36212
Bug ID: 36212
Summary: AVX-512: VPBROADCASTD from general purpose register is
suboptimal?
Product: libraries
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: nekotek...@gmail.com
CC: llvm-bugs@lists.llvm.org
Hello, I notice that LLVM likes to emit instructions like:
mov r9d, ...
vpbroadcastd xmm0{k1}, r9d
On the other hand, broadcast from the xmm register should have better latency:
vpbroadcastd xmm0{k1}, xmm1
I'm not an expert, but from what I know it's better to avoid any gpr<>xmm
transition because it's penalized.
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