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https://github.com/c64scene-ar/llvm-6502.git
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LLVM backend for 6502
c70c2cafe1
On Cortex-A8, we use the NEON v2f32 instructions for f32 arithmetic. For
better latency, we also send D-register copies down the NEON pipeline by
translating them to vorr instructions.
This patch promotes even S-register copies to D-register copies when
possible so they can also go down the NEON pipeline. Example:
vldr.32 s0, LCPI0_0
loop:
vorr d1, d0, d0
loop2:
...
vadd.f32 d1, d1, d16
The vorr instruction looked like this after regalloc:
%S2<def> = COPY %S0, %D1<imp-def>
Copies involving odd S-registers, and copies that don't define the full
D-register are left alone.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137182 91177308-0d34-0410-b5e6-96231b3b80d8
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