https://bugs.llvm.org/show_bug.cgi?id=36883
Bug ID: 36883
Summary: EarlyCSE MemorySSA breaks vpx_idct32x32_1024_add_neon
from libvpx when targeting armv7
Product: libraries
Version: 5.0
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Since SVN r306477 of LLVM ([EarlyCSE][MemorySSA] Enable MemorySSA in
function-simplification pass of EarlyCSE.; present in the 5.0 and 6.0
releases), the vpx_idct32x32_1024_add_neon (intrinsics based) function of
libvpx gets broken/misoptimized. Not yet sure if this is an LLVM bug or some
other wrong with the function that allows the optimizer to break it.
To work around the issue, one can build with "-mllvm
-enable-npm-earlycse-memssa=false -mllvm -enable-earlycse-memssa=false".
The same issue is reported for libvpx at
https://bugs.chromium.org/p/webm/issues/detail?id=1510.
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