https://bugs.llvm.org/show_bug.cgi?id=51783
Bug ID: 51783
Summary: Missed arithmetic fold
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]
LLVM optimizes bar into tgt here but not foo.
https://godbolt.org/z/jdeT7jbjd
int foo(int a, int b) {
return b * (1 + a / b) - a;
}
int bar(int a, int b) {
return b * (a / b) + b - a;
}
int tgt(int a, int b) {
return b - a % b;
}
https://alive2.llvm.org/ce/z/axgBxW
GCC appears to miss this too.
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