https://bugs.llvm.org/show_bug.cgi?id=45647
Bug ID: 45647
Summary: Missed peephole: xor-inc-add to xor-sub
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: lebedev...@gmail.com
CC: llvm-bugs@lists.llvm.org
define i8 @square(i8 %x, i8 %y) {
%t0 = xor i8 %x, -43
%t1 = add i8 %t0, 1
%r = add i8 %t1, %y
ret i8 %r
}
https://godbolt.org/z/EpjvTY
----------------------------------------
Name: zz
%t0 = xor i8 %x, -43
%t1 = add i8 %t0, 1
%r = add i8 %t1, %y
ret i8 %r
=>
%n0 = xor i8 %x, 42
%r = sub i8 %y, %n0
ret i8 %r
%t0 = xor i8 %x, -43
%t1 = add i8 %t0, 1
Done: 1
Transformation seems to be correct!
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