https://bugs.llvm.org/show_bug.cgi?id=38446
Bug ID: 38446
Summary: De morgan laws: fold not into other xor
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
https://rise4fun.com/Alive/8iv
Name: fold xor
%old0 = icmp slt i32 %x, 0
%old1 = icmp slt i8 %y, 0
%old2 = xor i1 %old0, %old1
%r = xor i1 %old2, true
=>
%new0 = icmp slt i32 %x, 0
%new1 = icmp sge i8 %y, 0
%r = xor i1 %new0, %new1
Name: fold xor, alternative
%old0 = icmp slt i32 %x, 0
%old1 = icmp slt i8 %y, 0
%old2 = xor i1 %old0, %old1
%r = xor i1 %old2, true
=>
%new0 = icmp sge i32 %x, 0
%new1 = icmp slt i8 %y, 0
%r = xor i1 %new0, %new1
https://godbolt.org/g/Jn8ZKQ
We'll be getting a lot of these from implicit conversion sanitizer.
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
