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4 Commits

Author SHA1 Message Date
Tom Stellard
4a5c408c28 AMDGPU/SI: Implement a custom MachineSchedStrategy 
Summary:
GCNSchedStrategy re-uses most of GenericScheduler, it's just uses
a different method to compute the excess and critical register
pressure limits.

It's not enabled by default, to enable it you need to pass -misched=gcn
to llc.

Shader DB stats:

32464 shaders in 17874 tests
Totals:
SGPRS: 1542846 -> 1643125 (6.50 %)
VGPRS: 1005595 -> 904653 (-10.04 %)
Spilled SGPRs: 29929 -> 27745 (-7.30 %)
Spilled VGPRs: 334 -> 352 (5.39 %)
Scratch VGPRs: 1612 -> 1624 (0.74 %) dwords per thread
Code Size: 36688188 -> 37034900 (0.95 %) bytes
LDS: 1913 -> 1913 (0.00 %) blocks
Max Waves: 254101 -> 265125 (4.34 %)
Wait states: 0 -> 0 (0.00 %)

Totals from affected shaders:
SGPRS: 1338220 -> 1438499 (7.49 %)
VGPRS: 886221 -> 785279 (-11.39 %)
Spilled SGPRs: 29869 -> 27685 (-7.31 %)
Spilled VGPRs: 334 -> 352 (5.39 %)
Scratch VGPRs: 1612 -> 1624 (0.74 %) dwords per thread
Code Size: 34315716 -> 34662428 (1.01 %) bytes
LDS: 1551 -> 1551 (0.00 %) blocks
Max Waves: 188127 -> 199151 (5.86 %)
Wait states: 0 -> 0 (0.00 %)

Reviewers: arsenm, mareko, nhaehnle, MatzeB, atrick

Subscribers: arsenm, kzhuravl, llvm-commits

Differential Revision: https://reviews.llvm.org/D23688

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279995 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-08-29 19:42:52 +00:00
Matt Arsenault
94166e75ac AMDGPU: fdiv -1, x -> rcp -x 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277535 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-08-02 22:25:04 +00:00
Matt Arsenault
f799c706db 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276823 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-07-26 23:25:44 +00:00
Matt Arsenault
faf8ffaefd AMDGPU: Rename intrinsics to use amdgcn prefix 
The intrinsic target prefix should match the target name
as it appears in the triple.

This is not yet complete, but gets most of the important ones.
llvm.AMDGPU.* intrinsics used by mesa and libclc are still handled
for compatability for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258557 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-01-22 21:30:34 +00:00