https://bugs.llvm.org/show_bug.cgi?id=39989
Bug ID: 39989
Summary: [LICM] loads hoisted out of vectorized loop but not
from scalar loop.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 21218
--> https://bugs.llvm.org/attachment.cgi?id=21218&action=edit
reduced testcase
I found a few cases of a loop with loads from loop-invariant addresses that get
vectorized. I am not sure why, but the loads in the vectorized loop get hoisted
by LICM, while those in the scalar loop remain inside the loop.
I wonder why that is - is this a known issue/behaviour or is this something to
be fixed in LICM?
Attached is a reduced test case which is not perfect, but at least has this
behaviour well exhibited in vector.body and (the original scalar) bb27.us.i
loops.
clang -cc1 -triple s390x-ibm-linux -S -save-temps=cwd -fmath-errno -target-cpu
z13 -v -O3 -w -vectorize-loops -vectorize-slp -o out.ll -emit-llvm
tc_licm_vec_scal.ll -mllvm -unroll-count=1
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