https://bugs.llvm.org/show_bug.cgi?id=42691
Bug ID: 42691
Summary: Combining comparisons to add and compare
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: nikita....@gmail.com
CC: llvm-bugs@lists.llvm.org
define i1 @test(i32 %x) {
%c1 = icmp slt i32 %x, 0
%c2 = icmp eq i32 %x, 2147483647
%c = or i1 %c1, %c2
ret i1 %c
}
could be combined to
define i1 @test(i32 %x) {
%y = add i32 %x, 1
%c = icmp slt i32 %y, 1
ret i1 %c
}
which is especially profitable if the add is already being computed for other
reasons.
https://rise4fun.com/Alive/GFm
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