http://llvm.org/bugs/show_bug.cgi?id=21473
Bug ID: 21473
Summary: [CFGSimplification] Generate none optimized constant
ADD operations
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13285
--> http://llvm.org/bugs/attachment.cgi?id=13285&action=edit
CFGSimplification Test Case
To reproduce by following command lines:
clang -O3 -S -emit-llvm simple.c
llc -march=aarch64 < simple.ll -print-after-all
We can see that in AArch64 backend, CFGSimplification generate none optimized
ADDs as follows:
...
%inc.1.1 = add nsw i32 2, 1
...
%inc.2.1 = add nsw i32 %inc.1.1, 1
...
%inc.1.2 = add nsw i32 %inc.1.1, 2
...
Such ADDs can be replaced by constants 3, 4, 5.
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