[PATCH] emit-rtl.c: Allow vector subreg of float vectors
Wed Aug 5 13:18:37 GMT 2020
This patch is a prerequisite for some patches I have to add multiple
vector sizes on amdgcn.
The problem is that validate_subreg rejects things like this:
(subreg:V32SF (reg:V64SF) 0)
These are commonly generated by the compiler. The integer equivalents
To be honest, I don't know why other targets have not encountered this
problem before? Perhaps because most other targets require all vectors
to have the same number of bits, meaning that float vectors have a fixed
number of lanes? In my case, amdgcn can convert V64SFmode to V32SFmode
by simply masking off some lanes.
OK to commit? (I have an x86_64 bootstrap and test in progress.)
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