https://llvm.org/bugs/show_bug.cgi?id=25270
Bug ID: 25270
Summary: llc produces incorrect assembler for knl
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: llc
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 15130
--> https://llvm.org/bugs/attachment.cgi?id=15130&action=edit
Reproducer (foo.ll is miscompiled).
llc produces incorrect assembler for knl. It tries to reuse the %var in two
Print calls, despite its value has changed. llc probably optimized away the
register spill of %var_load_load by reloading it. This bug occurs in foo.ll
file.
Compile:
llc -mcpu=knl call.ll
llc -mcpu=knl foo.ll
clang++ -march=knl foo.s call.s main.cpp
Run: sde -knl -- ./a.out
LLVM revision #250620
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