diff options
| author | Timothy Arceri <[email protected]> | 2018-11-20 15:23:45 +1100 |
|---|---|---|
| committer | Timothy Arceri <[email protected]> | 2019-03-12 00:52:30 +0000 |
| commit | 7571de8eaa50bca1e0162ce212c47a6f9e927120 (patch) | |
| tree | d25a20d7f5f791c040cf03e50a2f4caaf1bb9752 /src/compiler/nir/nir_from_ssa.c | |
| parent | 68ce0ec22244726c1b61d91936a6b79ac20ab77a (diff) | |
nir: unroll some loops with a variable limit
For some loops can have a single terminator but the exact trip
count is still unknown. For example:
for (int i = 0; i < imin(x, 4); i++)
...
Shader-db results radeonsi (all affected are from Tropico 5):
Totals from affected shaders:
SGPRS: 144 -> 152 (5.56 %)
VGPRS: 124 -> 108 (-12.90 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 5180 -> 6640 (28.19 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 17 -> 21 (23.53 %)
Wait states: 0 -> 0 (0.00 %)
Shader-db results i965 (SKL):
total loops in shared programs: 3808 -> 3802 (-0.16%)
loops in affected programs: 6 -> 0
helped: 6
HURT: 0
vkpipeline-db results RADV (Unrolls some Skyrim VR shaders):
Totals from affected shaders:
SGPRS: 304 -> 304 (0.00 %)
VGPRS: 296 -> 292 (-1.35 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 15756 -> 25884 (64.28 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 29 -> 29 (0.00 %)
Wait states: 0 -> 0 (0.00 %)
v2: fix bug where last iteration would get optimised away by
mistake.
Reviewed-by: Ian Romanick <[email protected]>
Diffstat (limited to 'src/compiler/nir/nir_from_ssa.c')
0 files changed, 0 insertions, 0 deletions