https://bugs.llvm.org/show_bug.cgi?id=51461
Bug ID: 51461
Summary: Missed accumulator recursion elimination
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]
Of the following simple recursive functions, LLVM is able to eliminate
recursion for foo but not bar:
int foo(int n) {
if(n <= 0) return 1;
return 2 + foo(n - 1);
}
int bar(int n) {
if(n <= 0) return 1;
return 2 * bar(n - 1);
}
GCC optimizes both. https://godbolt.org/z/rozMcn6o4.
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