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3 Commits

Author SHA1 Message Date
Matt Arsenault
7c41fae233 AMDGPU: Use rcp for fdiv 1, x with fpmath metadata 
Using rcp should be OK for safe math usually, so this
should not be replacing the original fdiv.

llvm-svn: 276823
 2016-07-26 23:25:44 +00:00
Matt Arsenault
75622c9e16 AMDGPU: Change fdiv lowering based on !fpmath metadata 
If 2.5 ulp is acceptable, denormals are not required, and
isn't a reciprocal which will already be handled, replace
with a faster fdiv.

Simplify the lowering tests by using per function
subtarget features.

llvm-svn: 276051
 2016-07-19 23:16:53 +00:00
Matt Arsenault
c4e8acd575 AMDGPU: Add stub custom CodeGenPrepare pass 
This will do various things including ones
CodeGenPrepare does, but with knowledge of uniform
values.

llvm-svn: 273657
 2016-06-24 07:07:55 +00:00