https://bugs.llvm.org/show_bug.cgi?id=49464
Bug ID: 49464
Summary: [InstCombiner] WRONG code
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24598
--> https://bugs.llvm.org/attachment.cgi?id=24598&action=edit
reduced testcase
The reduced program has a loop which executes only two iterations.
LoopVectorizer makes a loop with VF=2, but then InstCombiner removes most
relevant parts of both the scalar and vectorized loop.
clang -march=z14 wrong0.i -o a.out -Os -fno-vectorize -w && ./a.out
1
clang -march=z14 wrong0.i -o a.out -Os -w && ./a.out
0
The program is supposed to print '1'.
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