Comments (4)
jshufro
commented on June 21, 2024
Here's -v output around the failing section:
BOLT-INFO: Finished pass: print dyno-stats after optimizations
BOLT-INFO: Starting pass: simplify-conditional-tail-calls
BOLT-INFO: SCTC: patched 105 tail calls (104 forward) tail calls (1 backward) from a total of 105 while removing 0 double jumps and removing 74 basic blocks totalling 370 bytes of code. CTCs total execution count is 2 and the number of times CTCs are taken is 0.
BOLT-INFO: Finished pass: simplify-conditional-tail-calls
BOLT-INFO: Starting pass: aligner
BOLT-INFO: Finished pass: aligner
BOLT-INFO: Starting pass: reorder-data
BOLT-INFO: Finished pass: reorder-data
BOLT-INFO: Starting pass: finalize-functions
BOLT-INFO: Finished pass: finalize-functions
BOLT-INFO: Starting pass: frame-optimizer
BOLT-INFO: Finished pass: frame-optimizer
BOLT-INFO: Starting pass: alloc-combiner
BOLT-INFO: Finished pass: alloc-combiner
BOLT-INFO: Starting pass: inst-lowering
BOLT-INFO: Finished pass: inst-lowering
BOLT-INFO: Starting pass: lower-annotations
BOLT-INFO: Finished pass: lower-annotations
LLVM ERROR: Undefined temporary symbol
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jshufro
commented on June 21, 2024
Failing message looks to be emitted from ELFObjectWriter::computeSymbolTable
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maksfb
commented on June 21, 2024
It looks like you've hit a bug with our unreachable code elimination optimization. Thanks for reporting it! As a workaround, could you try to run BOLT with additional flags -eliminate-unreachable=0 -simplify-conditional-tail-calls=0?
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jshufro
commented on June 21, 2024
That looks to be a viable workaround- thanks!
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