Matt Arsenault e0bf7d02f0 AMDGPU: Don't use stack space for SGPR->VGPR spills ...

Before frame offsets are calculated, try to eliminate the
frame indexes used by SGPR spills. Then we can delete them
after.

I think for now we can be sure that no other instruction
will be re-using the same frame indexes. It should be easy
to notice if this assumption ever breaks since everything
asserts if it tries to use a dead frame index later.

The unused emergency stack slot seems to still be left behind,
so an additional 4 bytes is still wasted.

llvm-svn: 295753

2017-02-21 19:12:08 +00:00

8.1 KiB

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