llvm /
llvm /
b3dd66a5589f41754ab9614a5e7cc283213f0222 Merging r237152:
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r237152 | thomas.stellard | 2015-05-12 13:13:02 -0400 (Tue, 12 May 2015) | 20 lines
R600/SI: add pass to mark CF live ranges as non-spillable
Spilling can insert instructions almost anywhere, and this can mess
up control flow lowering in a multitude of ways, due to instruction
reordering. Let's sort this out the easy way: never spill registers
involved with control flow, i.e. saved EXEC masks.
Unfortunately, this does not work at all with optimizations disabled,
as the register allocator ignores spill weights. This should be
addressed in a future commit.
The test was reduced from the "stacks" shader of [1]. Some issues
trigger the machine verifier while another one is checked manually.
[1] http://madebyevan.com/webgl-path-tracing/
v2: only insert pass with optimizations enabled, merge test runs.
Patch by: Grigori Goronzy
git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@240282 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed
