[all-commits] [llvm/llvm-project] b4dff4: [mlir][spirv] Fix math.ctlz for full zero bit cases
Lei Zhang via All-commits
all-commits at lists.llvm.org
Tue Jun 14 16:41:48 PDT 2022
Author: Lei Zhang <antiagainst at google.com>
Date: 2022-06-14 (Tue, 14 Jun 2022)
[mlir][spirv] Fix math.ctlz for full zero bit cases
If the integer has all zero bits, GLSL FindUMsb would return -1.
So theoretically (31 - FindUMsb) should still give use the correct
result. However, Adreno GPUshave issues with this:
This looks like a driver bug. So handle the corner case explicity
to workaround it.
Reviewed By: mravishankar
Differential Revision: https://reviews.llvm.org/D127747
More information about the All-commits