https://bugs.llvm.org/show_bug.cgi?id=51184
Bug ID: 51184
Summary: Multiple evaluations of a GEP
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 25056
--> https://bugs.llvm.org/attachment.cgi?id=25056&action=edit
test case
In the attached test case there is this instruction
%h3 = getelementptr inbounds %struct.entry_t, %struct.entry_t* %2, i64
%idxprom, i32 0, i64 0, i32 0
and 12-13 more similar instructions like
%h3.3 = getelementptr inbounds %struct.entry_t, %struct.entry_t* %2, i64
%idxprom, i32 0, i64 3, i32 0
which begin with the same part `getelementptr inbounds %struct.entry_t,
%struct.entry_t* %2, i64 %idxprom`
When the attached test case is compiled with
`opt --passes="default<O3>" store.ll -S -o - | lcc`
the output assembly file still contains multiple evaluations of that part, e.g.
mov w15, #48
madd x15, x9, x15, x8
...
mov w13, #48
madd x13, x9, x13, x8
etc.
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