[PATCH] Optimize icmp involving addition better
David Majnemer
david.majnemer at gmail.com
Tue Apr 9 21:12:56 PDT 2013
Hello,
The attached patch allows LLVM to optimize sequences like the
%add = add nsw i32 %x, 1
%cmp = icmp sgt i32 %add, %y
into:
%cmp = icmp sge i32 %x, %y
as well as:
%add1 = add nsw i32 %x, 20
%add2 = add nsw i32 %y, 57
%cmp = icmp sge i32 %add1, %add2
into:
%add = add nsw i32 %y, 37
%cmp = icmp sle i32 %cmp, %x
Patches are attached and apply cleanly on r179146
Thanks,
David Majnemer
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